Cover Page - USD ($)	12 Months Ended
Cover Page - USD ($)	Dec. 31, 2019	Feb. 18, 2020	Jun. 28, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-34626
Entity Registrant Name	Piedmont Office Realty Trust, Inc.
Entity Central Index Key	0001042776
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	58-2328421
Entity Address, Address Line One	5565 Glenridge Connector Ste. 450
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30342
City Area Code	770
Local Phone Number	418-8800
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	PDM
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Emerging Growth	false
Entity Shell Company	false
Entity Public Float			$ 2,452,465,154
Entity Common Stock, Shares Outstanding		125,889,222
Documents Incorporated by Reference	Registrant incorporates by reference portions of the Piedmont Office Realty Trust, Inc. Definitive Proxy Statement for the 2020 Annual Meeting of Stockholders (Items 10, 11, 12, 13, and 14 of Part III) to be filed no later than April 29, 2020.

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Land	$ 506,389	$ 470,432
Buildings and improvements, less accumulated depreciation of $797,573 and $718,070 as of December 31, 2019 and December 31, 2018, respectively	2,325,222	2,121,570
Intangible lease assets, less accumulated amortization of $78,204 and $87,391 as of December 31, 2019 and December 31, 2018, respectively	80,979	77,676
Construction in progress	29,920	15,848
Real estate assets held for sale, net	0	331,068
Total real estate assets	2,942,510	3,016,594
Cash and cash equivalents	13,545	4,571
Tenant receivables	8,226	10,800
Straight-line rent receivables	151,118	136,762
Restricted cash and escrows	1,841	1,463
Prepaid expenses and other assets	25,427	24,691
Goodwill	98,918	98,918
Interest rate swaps	0	1,199
Deferred lease costs, less accumulated amortization of $182,281 and $176,919 as of December 31, 2019 and December 31, 2018, respectively	275,172	236,198
Other assets held for sale, net	0	61,233
Total assets	3,516,757	3,592,429
Liabilities:
Unsecured debt, net of discount and unamortized debt issuance costs of $7,626 and $9,879 as of December 31, 2019 and December 31, 2018, respectively	1,292,374	1,495,121
Secured debt, inclusive of premiums and unamortized debt issuance costs of $343 and $645 as of December 31, 2019 and December 31, 2018, respectively	189,030	190,351
Accounts payable, accrued expenses, and accrued capital expenditures	117,496	93,739
Dividends payable	26,427	26,972
Deferred income	34,609	28,779
Intangible lease liabilities, less accumulated amortization of $51,566 and $59,144 as of December 31, 2019 and December 31, 2018, respectively	32,726	35,708
Interest rate swaps	5,121	839
Other liabilities held for sale, net	0	8,780
Total liabilities	1,697,783	1,880,289
Commitments and Contingencies (Note 8)	0	0
Stockholders' Equity:
Shares-in-trust, 150,000,000 shares authorized, none outstanding as of December 31, 2019 or December 31, 2018	0	0
Preferred stock, no par value, 100,000,000 shares authorized, none outstanding as of December 31, 2019 or December 31, 2018	0	0
Common stock, $0.01 par value; 750,000,000 shares authorized, 125,783,408 shares issued and outstanding as of December 31, 2019; and 126,218,554 shares issued and outstanding at December 31, 2018	1,258	1,262
Additional paid-in capital	3,686,398	3,683,186
Cumulative distributions in excess of earnings	(1,871,375)	(1,982,542)
Other comprehensive income	967	8,462
Piedmont stockholders’ equity	1,817,248	1,710,368
Noncontrolling interest	1,726	1,772
Total stockholders’ equity	1,818,974	1,712,140
Total liabilities and stockholders’ equity	$ 3,516,757	$ 3,592,429

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Intangible lease assets, accumulated amortization	$ (78,204)	$ (87,391)
Deferred lease costs, accumulated amortization	(182,281)	(176,919)
Liabilities:
Intangible lease liabilities, accumulated amortization	$ (51,566)	$ (59,144)
Stockholders' Equity:
Shares-in-trust, shares authorized	150,000,000	150,000,000
Shares-in-trust, shares outstanding	0	0
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	125,783,408	126,218,554
Common stock, shares outstanding	125,783,408	126,218,554
Unsecured Debt
Liabilities:
Discount (premium) and unamortized debt issuance costs	$ 7,626	$ 9,879
Secured Debt
Liabilities:
Discount (premium) and unamortized debt issuance costs	(343)	(645)
Building and building improvements
Assets:
Buildings and improvements, accumulated depreciation	$ (797,573)	$ (718,070)

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Rental and tenant reimbursement revenue									$ 511,905	$ 504,410	$ 553,264
Total revenues	$ 134,153	$ 135,421	$ 130,668	$ 132,936	$ 137,185	$ 129,708	$ 129,174	$ 129,900	533,178	525,967	574,173
Expenses:
Property operating costs									211,380	209,338	222,441
Depreciation									106,015	107,956	119,288
Amortization									76,666	63,295	75,367
Impairment loss on real estate assets									8,953	0	46,461
General and administrative									37,895	29,713	29,319
Expenses									440,909	410,302	492,876
Other income (expense):
Interest expense									(61,594)	(61,023)	(68,124)
Other income/(expense)									1,571	1,638	657
Equity in income of unconsolidated joint ventures									0	0	3,845
Loss on extinguishment of debt									0	(1,680)	0
Gain on sale of real estate assets, net	157,640	32	1,451	37,887	30,505	0	(23)	45,209	197,010	75,691	115,874
Nonoperating Income (Expense)									136,987	14,626	52,252
Net income	162,476	8,419	8,152	50,209	45,409	16,114	10,940	57,828	229,256	130,291	133,549
Net loss applicable to noncontrolling interest									5	5	15
Net income applicable to Piedmont	$ 162,478	$ 8,422	$ 8,153	$ 50,208	$ 45,410	$ 16,114	$ 10,942	$ 57,830	$ 229,261	$ 130,296	$ 133,564
Per share information— basic and diluted:
Net income available to common stockholders (in dollars per share)	$ 1.29	$ 0.07	$ 0.06	$ 0.40					$ 1.82	$ 1.00	$ 0.92
Weighted-average shares outstanding - basic (in shares)									125,709,207	130,161,202	145,043,503
Weighted-average shares outstanding - diluted (in shares)									126,182,137	130,635,650	145,379,994
Property management fee revenue
Revenues:
Property related revenue									$ 3,398	$ 1,450	$ 1,735
Other property related income
Revenues:
Property related revenue									$ 17,875	$ 20,107	$ 19,174

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income applicable to Piedmont	$ 229,261	$ 130,296	$ 133,564
Other comprehensive income/(loss):
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 5)	(5,659)	692	2,479
Plus/(less): Reclassification of net loss/(gain) included in net income (See Note 5)	(1,836)	(300)	3,502
Gain on investment in available for sale securities	0	0	79
Other comprehensive income	(7,495)	392	6,060
Comprehensive income applicable to Piedmont	$ 221,766	$ 130,688	$ 139,624

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Cumulative Distributions in Excess of Earnings	Other Comprehensive Income/(Loss)	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2016		145,235,000
Beginning balance, value at Dec. 31, 2016	$ 2,097,703	$ 1,452	$ 3,673,128	$ (1,580,863)	$ 2,104	$ 1,882
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchases as part of an announced plan (in shares)		(3,133,000)
Share repurchases as part of an announced plan	(61,750)	$ (31)		(61,719)
Offering costs	(182)		(182)
Dividends to common stockholders, dividends to preferred stockholders of subsidiary, and dividends reinvested	(193,541)		(233)	(193,263)		(45)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		257,000
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	4,650	$ 3	4,647
Net loss applicable to noncontrolling interest	(15)					(15)
Net income applicable to Piedmont	133,564			133,564
Other comprehensive income	6,060				6,060
Ending balance, (in shares) at Dec. 31, 2017		142,359,000
Ending balance, value at Dec. 31, 2017	1,986,489	$ 1,424	3,677,360	(1,702,281)	8,164	1,822
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchases as part of an announced plan (in shares)		(16,495,000)
Share repurchases as part of an announced plan	(301,678)	$ (165)		(301,513)
Offering costs	(85)		(85)
Dividends to common stockholders, dividends to preferred stockholders of subsidiary, and dividends reinvested	(109,265)		(82)	(109,138)		(45)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		355,000
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	5,996	$ 3	5,993
Net loss applicable to noncontrolling interest	(5)					(5)
Net income applicable to Piedmont	130,296			130,296
Other comprehensive income	$ 392				392
Ending balance, (in shares) at Dec. 31, 2018	126,218,554	126,219,000
Ending balance, value at Dec. 31, 2018	$ 1,712,140	$ 1,262	3,683,186	(1,982,542)	8,462	1,772
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchases as part of an announced plan (in shares)		(728,000)
Share repurchases as part of an announced plan	(12,482)	$ (7)		(12,475)
Offering costs	(710)		(710)
Dividends to common stockholders, dividends to preferred stockholders of subsidiary, and dividends reinvested	$ (105,888)		(228)	(105,619)		(41)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)	292,675	292,000
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	$ 4,153	$ 3	4,150
Net loss applicable to noncontrolling interest	(5)					(5)
Net income applicable to Piedmont	229,261			229,261
Other comprehensive income	$ (7,495)				(7,495)
Ending balance, (in shares) at Dec. 31, 2019	125,783,408	125,783,000
Ending balance, value at Dec. 31, 2019	$ 1,818,974	$ 1,258	3,686,398	(1,871,375)	967	1,726
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income applicable to Piedmont	$ 162,478
Ending balance, (in shares) at Dec. 31, 2019	125,783,408	125,783,000
Ending balance, value at Dec. 31, 2019	$ 1,818,974	$ 1,258	$ 3,686,398	$ (1,871,375)	$ 967	$ 1,726

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends to common stockholders (in dollars per share)	$ 0.84	$ 0.84	$ 1.34

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net income	$ 229,256	$ 130,291	$ 133,549
Operating distributions received from unconsolidated joint ventures	0	10	11
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	106,015	107,956	119,288
Amortization of debt issuance costs net of favorable settlement of interest rate swaps	87	(250)	1,588
Other amortization	71,609	58,330	73,944
Impairment loss on real estate assets	8,953	0	46,461
Loss on extinguishment of debt	0	1,665	0
Stock compensation expense	15,446	9,737	9,196
Equity in income of unconsolidated joint ventures	0	0	(3,845)
Gain on sale of real estate assets	(197,010)	(75,691)	(115,874)
Changes in assets and liabilities:
Increase in tenant and straight-line rent receivables	(15,706)	(16,094)	(21,392)
Decrease/(increase) in prepaid expenses and other assets	309	(3,095)	384
Decrease in accounts payable and accrued expenses	(11,251)	(9,092)	(1,521)
Increase/(decrease) in deferred income	776	(898)	1,016
Net cash provided by operating activities	208,484	202,869	242,805
Cash Flows from Investing Activities:
Acquisition of real estate assets and intangibles	(326,200)	(151,914)	(35,262)
Capitalized expenditures	(103,553)	(72,105)	(79,831)
Net sale proceeds from wholly-owned properties	589,767	575,227	375,518
Net sale proceeds received from unconsolidated joint ventures	0	0	12,334
Investments in unconsolidated joint ventures	0	0	(1,162)
Note receivable issuance	0	(3,200)	0
Note receivable payment	0	3,200	0
Deferred lease costs paid	(25,639)	(27,430)	(30,985)
Net cash provided by/(used in) investing activities	134,375	323,778	240,612
Cash Flows from Financing Activities:
Debt issuance and other costs paid	(151)	(1,040)	(132)
Proceeds from debt	592,000	977,062	180,000
Repayments of debt	(798,019)	(1,020,455)	(476,401)
Costs of issuance of common stock	(710)	(85)	(182)
Value of shares withheld for payment of taxes related to employee stock compensation	(3,295)	(2,219)	(3,403)
Repurchases of common stock as part of announced plan	(16,899)	(298,538)	(60,474)
Dividends paid and discount on dividend reinvestments	(106,433)	(184,093)	(122,274)
Net cash used in financing activities	(333,507)	(529,368)	(482,866)
Net increase/(decrease) in cash, cash equivalents, and restricted cash and escrows	9,352	(2,721)	551
Cash, cash equivalents, and restricted cash and escrows, beginning of year	6,034	8,755	8,204
Cash, cash equivalents, and restricted cash and escrows, end of year	$ 15,386	$ 6,034	$ 8,755

Organization	12 Months Ended
Organization	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Piedmont Office Realty Trust, Inc. (“Piedmont”) (NYSE: PDM) is a Maryland corporation that operates in a manner so as to qualify as a real estate investment trust (“REIT”) for federal income tax purposes and engages in the acquisition, development, redevelopment, management, and ownership of commercial real estate properties located primarily in select sub-markets within seven major Eastern U.S. office markets, including properties that are under construction, are newly constructed, or have operating histories. Piedmont was incorporated in 1997 and commenced operations in 1998. Piedmont conducts business primarily through Piedmont Operating Partnership, L.P. (“Piedmont OP”), a Delaware limited partnership, as well as performing the management of its buildings through two wholly-owned subsidiaries, Piedmont Government Services, LLC and Piedmont Office Management, LLC. Piedmont owns 99.9% of, and is the sole general partner of, Piedmont OP and as such, possesses full legal control and authority over the operations of Piedmont OP. The remaining 0.1% ownership interest of Piedmont OP is held indirectly by Piedmont through its wholly-owned subsidiary, Piedmont Office Holdings, Inc. ("POH"), the sole limited partner of Piedmont OP. Piedmont OP owns properties directly, through wholly-owned subsidiaries, and through various joint ventures which it controls. References to Piedmont herein shall include Piedmont and all of its subsidiaries, including Piedmont OP and its subsidiaries and joint ventures. As of December 31, 2019, Piedmont owned 54 in-service office properties and one redevelopment asset, comprising approximately 487,000 square feet (unaudited), in select sub-markets located within seven major U.S. office markets: Atlanta, Boston, Dallas, Minneapolis, New York, Orlando, and Washington, D.C. As of December 31, 2019, Piedmont's 54 in-service office properties comprised approximately 16.0 million square feet (unaudited) of primarily Class A commercial office space and were 91.2% leased. Piedmont internally evaluates all of its real estate assets as one operating segment, and accordingly does not report segment information.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

The consolidated financial statements of Piedmont are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of Piedmont, Piedmont’s wholly-owned subsidiaries, any variable interest entity ("VIE") of which Piedmont or any of its wholly-owned subsidiaries is considered to have the power to direct the activities of the entity and the obligation to absorb losses/right to receive benefits, or any entity in which Piedmont or any of its wholly-owned subsidiaries owns a controlling interest. In determining whether Piedmont or Piedmont OP has a controlling interest, the following factors, among others, are considered: equity ownership, voting rights, protective rights of investors, and participatory rights of investors.

Piedmont owns a majority interest in four properties through three joint ventures. Two of these joint ventures, 1201 and 1225 Eye Street, NW Associates, which own the 1201 and 1225 Eye Street buildings, respectively, in Washington, D.C. are consolidated using the method prescribed in accounting for VIEs. The other joint venture, Piedmont-CNL Towers Orlando, LLC, which owns CNL Center I and II, in Orlando, Florida is an investment consolidated under the voting model. Accordingly, Piedmont’s consolidated financial statements include the accounts of 1201 Eye Street, NW Associates, LLC, 1225 Eye Street, NW Associates, LLC, and Piedmont-CNL Towers Orlando, LLC.

All inter-company balances and transactions have been eliminated upon consolidation.

Piedmont has formed special purpose entities to acquire and hold real estate. Each special purpose entity is a separate legal entity and consequently the assets of the special purpose entities are not available to all creditors of Piedmont. The assets owned by these special purpose entities are being reported on a consolidated basis with Piedmont’s assets for financial reporting purposes only.

Use of Estimates

The preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying consolidated financial statements and notes. Actual results could differ from those estimates.

Real Estate Assets

Piedmont classifies its real estate assets as long-lived assets held for use or as long-lived assets held for sale. Held for use assets are stated at cost, as adjusted for any impairment loss, less accumulated depreciation. Held for sale assets are carried at lower of depreciated cost or estimated fair value, less estimated costs to sell. Piedmont generally reclassifies assets as held for sale once a sales contract has been executed and earnest money has become non-refundable.

Amounts capitalized to real estate assets consist of the cost of acquisition or construction, any tenant improvements or major improvements, betterments that extend the useful life of the related asset, and transaction costs associated with the acquisition of an individual asset that does not qualify as a business combination. All repairs and maintenance are expensed as incurred. Additionally, Piedmont capitalizes interest while the development, or redevelopment, of a real estate asset is in progress.

Piedmont’s real estate assets are depreciated or amortized using the straight-line method over the following useful lives:


Buildings			40 years
Building improvements			5-25 years
Land improvements			20-25 years
Tenant allowances			Lease term
Furniture, fixtures, and equipment			3-10 years
Intangible lease assets			Lease term

Piedmont continually monitors events and changes in circumstances that could indicate that the carrying amounts of the real estate and related intangible assets of either operating properties or properties under construction in which Piedmont has an ownership interest, either directly or through investments in joint ventures, may not be recoverable. When indicators of potential impairment are present, management assesses whether the respective carrying values will be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition for assets held for use, or from the estimated fair values, less costs to sell, for assets held for sale. In the event that the expected undiscounted future cash flows for assets held for use or the estimated fair value, less costs to sell, for assets held for sale do not exceed the respective asset carrying value, management adjusts such assets to the respective estimated fair values and recognizes an impairment loss. Estimated fair values are calculated based on the following information, depending upon availability, in order of preference: (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of undiscounted cash flows, including estimated sales value (which is based on key assumptions such as estimated market rents, lease-up periods, estimated lease terms, and capitalization and discount rates) less estimated selling costs.

Fair Value of Assets and Liabilities of Acquired Properties

Upon the acquisition of real properties, Piedmont records the fair value of properties (plus any related acquisition costs) allocated based on relative fair value as tangible assets, consisting of land and building, and identified intangible assets and liabilities, consisting of the value of above-market and below-market leases and the value of in-place leases, based on their estimated fair values. Substantially all of Piedmont's property acquisitions qualify as asset acquisitions under Accounting Standards Codification ("ASC") 805, Business Combinations.

The estimated fair values of the tangible assets of an acquired property are determined by valuing the property as if it were vacant, and the “as-if-vacant” value is then allocated to land and building based on management’s determination of the estimated fair value of these assets. Management relies on a sales comparison approach using closed land sales and listings in determining the land value, and determines the as-if-vacant estimated fair value of a property using methods similar to those used by independent appraisers. Factors considered by management in performing these analyses include an estimate of carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance, and other operating expenses and estimates of lost rental revenue during the expected lease-up periods based on current market demand. Management also estimates the cost to execute similar leases including leasing commissions, legal, and other related costs.

The estimated fair values of above-market and below-market in-place leases are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) management’s estimate of market rates for the corresponding in-place leases, measured over a period equal to the remaining terms of the leases, taking into consideration the probability of renewals for any below-market leases. The capitalized above-market and below-market lease values are recorded as intangible lease assets or liabilities and amortized as an adjustment to rental revenues over the remaining terms of the respective leases.

The estimated fair values of in-place leases include an estimate of the direct costs associated with obtaining the acquired or "in place" tenant, estimates of opportunity costs associated with lost rentals that are avoided by acquiring an in-place lease. The amount capitalized as direct costs associated with obtaining a tenant include commissions, tenant improvements, and other direct costs and are estimated based on management’s consideration of current market costs to execute a similar lease. These direct lease origination costs are included in deferred lease costs in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases. The value of opportunity costs is calculated using the contractual amounts to be paid pursuant to the in-place leases over a market absorption period for a similar lease. These lease intangibles are included in intangible lease assets in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases.

Gross intangible assets and liabilities, inclusive of amounts classified as real estate assets held for sale, recorded at acquisition as of December 31, 2019 and 2018, respectively, are as follows (in thousands):


	December 31, 2019		December 31, 2018
Intangible Lease Assets:
Above-Market In-Place Lease Assets	$	2,082	$	7,620
In-Place Lease Valuation	$	157,101	$	157,447
Intangible Lease Origination Costs (included as component of Deferred Lease Costs)	$	256,627	$	241,516
Intangible Lease Liabilities (Below-Market In-Place Leases)	$	84,292	$	94,852

For the years ended December 31, 2019, 2018, and 2017, respectively, Piedmont recognized amortization of intangible lease costs as follows (in thousands):


	2019		2018		2017
Amortization of Intangible Lease Origination Costs and In-Place Lease Valuation included in amortization expense	$	62,413	$	48,940	$	58,467
Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues	$	8,322	$	7,615	$	6,575

Net intangible assets and liabilities as of December 31, 2019 will be amortized as follows (in thousands):


	Intangible Lease Assets
	Above-Market In-place Lease Assets		In-Place Lease Valuation		Intangible Lease Origination Costs ⁽¹⁾		Below-Market In-place Lease Liabilities
For the year ending December 31:
2020	$	423	$	22,397	$	34,267	$	8,304
2021	367		18,650		30,112		7,901
2022	272		13,950		23,341		6,421
2023	97		9,383		16,055		4,616
2024	64		4,861		9,576		1,706
Thereafter	—		10,515		22,957		3,778
	$	1,223	$	79,756	$	136,308	$	32,726

Weighted-Average Amortization Period (in years)	3		5		6		5

⁽¹⁾Included as a component of Deferred Lease Costs in the accompanying consolidated balance sheets.

Investments in and Amounts Due from Unconsolidated Joint Ventures

During the year ended December 31, 2017, Piedmont sold its investment in its last remaining unconsolidated joint venture. Prior to this disposition, Piedmont had accounted for its unconsolidated joint ventures using the equity method of accounting, whereby original investments were recorded at cost and subsequently adjusted for contributions, distributions, net income/(loss), and "other than temporary" impairment losses, if any, attributable to such joint ventures. All income and distributions were allocated to the joint venture partners in accordance with their respective ownership interests. Any distributions were classified on the accompanying consolidated statements of cash flow using the nature of distribution approach. Any distributions of net cash from operations were classified as cash inflows from operating activities, as they were presumed to be returns on Piedmont’s investment in the joint venture. Any proceeds received as the result of a sale of an asset from an unconsolidated joint venture were considered a return of Piedmont’s investment in the joint venture and classified as cash inflows from investing activities.

Cash and Cash Equivalents

Piedmont considers all highly-liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash equivalents include cash and short-term investments. The majority of Piedmont’s cash and cash equivalents are held at major commercial banks and at times may exceed the Federal Deposit Insurance Corporation limit of $250,000. Short-term investments consist of investments in money market accounts stated at cost, which approximates estimated fair value, and available-for-sale securities resulting from Piedmont's non-qualified deferred compensation program carried at estimated fair value.

Tenant Receivables and Straight-line Rent Receivables

Tenant receivables are comprised of rental and reimbursement billings due from tenants, and straight-line rent receivables representing the cumulative amount of future adjustments necessary to present rental income on a straight-line basis. Effective January 1, 2019, Piedmont adopted ASC 842 Leases ("ASC 842") (see Accounting Pronouncements Adopted During the Year Ended December 31, 2019 below for more detail) as well as Accounting Standards Update ("ASU"), ASU No. 2018-19 ("ASU 2018-19") which clarifies that operating lease receivables are within the scope of ASC 842; therefore, Piedmont has elected to evaluate the collectibility of its operating lease receivables on a tenant/lease-specific basis and, as of January 1, 2019, began recognizing changes in the collectibility assessment of its operating lease receivables as a reduction of rental and tenant reimbursement revenue, rather than as bad debt expense, a component of property operating costs. Prior to the adoption of ASC 842, during the years ended December 31, 2018 and 2017, Piedmont recognized approximately $91,000 and $350,000, respectively, of expense related to uncollectible operating lease receivables as additional property operating costs.

Restricted Cash and Escrows

Restricted cash and escrows principally relate to the following types of items:

•escrow accounts held by lenders to pay future real estate taxes, insurance, debt service, and tenant improvements;

•net sales proceeds from property sales held by qualified intermediary for potential Section 1031 exchange;

•earnest money paid in connection with future acquisitions; and

•security and utility deposits paid by tenants per the terms of their respective leases.

Restricted cash and escrows are generally reclassified to other asset or liability accounts upon being used to purchase assets, satisfy obligations, or settle tenant obligations.

Prepaid Expenses and Other Assets

Prepaid expenses and other assets are primarily comprised of the following items:

•prepaid property taxes, insurance and operating costs;

•receivables which are unrelated to tenants, for example, insurance proceeds receivable from insurers related to casualty losses; and

•equipment, furniture and fixtures, and tenant improvements for Piedmont’s corporate office and property management office space, net of accumulated depreciation.

Prepaid expenses and other assets will be expensed as utilized or depreciated in the case of Piedmont's corporate assets. Balances without a future economic benefit are expensed as they are identified.

Goodwill

Goodwill is the excess of cost of an acquired entity over the amounts specifically assigned to assets acquired and liabilities assumed in purchase accounting for business combinations. Piedmont tests the carrying value of its goodwill for impairment on an annual basis, or on an interim basis if an event occurs or circumstances change that would indicate the carrying amount may be impaired. Such interim circumstances may include, but are not limited to, significant adverse changes in legal factors or in the general business climate, adverse action or assessment by a regulator, unanticipated competition, the loss of key personnel, or persistent declines in an entity’s stock price below carrying value of the entity. Piedmont first assesses qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the estimated fair value of the reporting unit is less than its carrying amount. Piedmont internally evaluates its consolidated financial position and all of its operations as one reporting unit. If Piedmont concludes, after assessing the totality of events and circumstances during the qualitative analysis, that it is more likely than not that the goodwill balance is impaired, then Piedmont will recognize a goodwill impairment loss by the excess of the reporting unit’s carrying amount over its estimated fair value (not to exceed the total goodwill allocated to that reporting unit). There were no changes in the carrying amount of Piedmont's goodwill during the year ended December 31, 2019.

Interest Rate Derivatives

Piedmont periodically enters into interest rate derivative agreements to hedge its exposure to changing interest rates. As of December 31, 2019 and 2018, all of Piedmont's interest rate derivatives were designated as effective cash flow hedges and carried on the balance sheet at estimated fair value. Piedmont reassesses the effectiveness of its derivatives designated as cash flow hedges on a regular basis to determine if they continue to be highly effective and if the forecasted transactions remain highly probable. Piedmont does not use derivatives for trading or speculative purposes.

The changes in estimated fair value of interest rate swap agreements designated as effective cash flow hedges are recorded in other comprehensive income (“OCI”), and subsequently reclassified to earnings when the hedged transactions occur. The estimated fair value of the interest rate derivative agreement is recorded as interest rate derivative asset or as interest rate derivative liability in the accompanying consolidated balance sheets. Amounts received or paid under interest rate derivative agreements are recorded as reductions or additions to interest expense in the consolidated statements of income as incurred. Additionally, when Piedmont settles forward starting swap agreements, any gain or loss is recorded as accumulated other comprehensive income and is amortized to interest expense over the term of the respective notes on a straight line basis (which approximates the effective interest method). Further, Piedmont classifies cash flows from the settlement of hedging derivative instruments in the same category as the underlying exposure which is being hedged. Settlements resulting from the hedge of Piedmont's exposure to interest rate changes are classified as operating cash flows in the accompanying consolidated statements of cash flows.

Deferred Lease Costs

Deferred lease costs are comprised of costs and incentives incurred to acquire operating leases. In addition to direct costs, deferred lease costs also include intangible lease origination costs related to in-place leases acquired as part of a property acquisition. Prior to the adoption of ASC 842 on January 1, 2019, Piedmont capitalized direct payroll costs incurred related to negotiating and executing specific leases of approximately $0.3 million for both the years ended December 31, 2018, and 2017. ASC 842 prohibited the capitalization of such costs beginning January 1, 2019.

Deferred lease costs are amortized on a straight-line basis over the terms of the related underlying leases in the accompanying consolidated statements of income as follows:

•Approximately $50.3 million, $43.6 million, and $50.8 million of deferred lease costs for the years ended December 31, 2019, 2018, and 2017, respectively, are included in amortization expense; and

•Approximately $3.2 million, $2.6 million, and $4.8 million, of deferred lease costs related to lease incentives granted to tenants for the years ended December 31, 2019, 2018, and 2017, respectively, was included as an offset to rental and tenant reimbursement revenue.

Upon receipt of a lease termination notice, Piedmont adjusts the amortization of any unamortized deferred lease costs to be recognized ratably over the revised remaining term of the lease after giving effect to the termination notice. If there is no remaining lease term and no other obligation to provide the tenant space in the property, then any unamortized tenant-specific costs are recognized immediately upon termination.

Debt

When mortgage debt is assumed upon the acquisition of real property, Piedmont adjusts the loan to relative fair value with a corresponding adjustment to building and other intangible assets assumed as part of the purchase. The fair value adjustment is amortized to interest expense over the term of the loan using the effective interest method. Amortization of such fair value adjustments was approximately $0.5 million for each of the years ended December 31, 2019, 2018, and 2017, respectively.

Piedmont records premiums and discounts on debt issuances as an increase/decrease to the principal amount of the loan in the accompanying consolidated balance sheets, and amortizes such premiums or discounts as a component of interest expense over the life of the underlying loan facility using the effective interest method. Piedmont recorded discount amortization of approximately $0.2 million for each of the years ended December 31, 2019, 2018, and 2017, respectively.

Piedmont presents all debt issuance costs as an offset to the principal amount of debt in the accompanying consolidated balance sheets. Piedmont amortizes these costs to interest expense on a straight-line basis (which approximates the effective interest rate method) over the terms of the related financing arrangements. Piedmont recognized amortization of such costs for the years ended December 31, 2019, 2018, and 2017 of approximately $2.4 million, $2.4 million, and $2.8 million, respectively.

Deferred income

Deferred income is primarily comprised of the following items:

•prepaid rent from tenants; and

•tenant reimbursements related to operating expense or property tax expenses which may be due to tenants as part of an annual operating expense reconciliation.

•tenant improvement allowance overages where Piedmont owns the underlying improvements

Deferred income related to prepaid rents from tenants will be recognized as income in the period it is earned. Amounts related to operating expense reconciliations or property tax expense are relieved when the tenant's reconciliation is completed in accordance with the underlying lease, and payment is issued to the tenant. Tenant improvement allowance overages paid by the tenant, where Piedmont owns all of the underlying improvements, are recorded as deferred income and amortized on a straight-line basis into rental and tenant reimbursement revenue over the term of the respective leases.

Shares-in-trust

To date, Piedmont has not issued any shares-in-trust; however, under Piedmont’s charter, it has authority to issue a total of 150,000,000 shares-in-trust, which would be issued only in the event that there is a purported transfer of, or other change in or affecting the ownership of, Piedmont’s capital stock that would result in a violation of the ownership limits that are included in Piedmont’s charter to protect its REIT status.

Preferred Stock

To date, Piedmont has not issued any shares of preferred stock; however, Piedmont is authorized to issue up to 100,000,000 shares of one or more classes or series of preferred stock. Piedmont’s board of directors may determine the relative rights, preferences, and privileges of any class or series of preferred stock that may be issued, and can be more beneficial than the rights, preferences, and privileges attributable to Piedmont’s common stock.

Common Stock

Under Piedmont’s charter, it has authority to issue a total of 750,000,000 shares of common stock with a par value of $0.01 per share. Each share of common stock is entitled to one vote and participates in distributions equally. During the year ended December 31, 2018, the board of directors of Piedmont re-authorized the stock repurchase program under which Piedmont may repurchase its own shares from time to time, in accordance with applicable securities laws, in the open market or in privately negotiated transactions. The timing of repurchases is dependent upon market conditions and other factors, and repurchases may be commenced or suspended from time to time in Piedmont's discretion, without prior notice. As of December 31, 2019, Piedmont had approximately $74.1 million in remaining capacity under the program which may be used for share repurchases through February 2020. On February 19, 2020, Piedmont's Board of Directors extended the authorization for up to $200 million in share repurchases through February 2022, at the discretion of management.

Equity Securities Issued At-The-Market

Under Piedmont's at-the-market stock offering program ("ATM program"), Piedmont may offer and sell shares of its common stock from time to time in “at-the-market” offerings with an aggregate gross sales price of up to $250 million. In connection with the ATM Program, Piedmont may, at its discretion, enter into forward equity sale agreements. The use of a forward equity sale agreement would allow Piedmont to lock in a share price on the sale of shares of its common stock at the time the agreement is executed, but defer receiving the proceeds from the sale of shares until a later date, allowing Piedmont to better align such funding with its capital needs. Sales of shares of Piedmont’s common stock through its banking relationships, if any, will be made in amounts and at times to be determined by Piedmont from time to time, but Piedmont has no obligation to sell any of the shares in the offering and may suspend sales in connection with the offering at any time. Sales of Piedmont's common stock under forward equity sale agreements, if undertaken, meet the derivatives and hedging guidance scope exception to be accounted for as equity instruments based on the following assessments: (i) none of the agreements’ exercise contingencies were based on observable markets or indices besides those related to the market for Piedmont's own stock price and operations; and (ii) none of the settlement provisions precluded the agreements from being indexed to Piedmont's own stock.

Underwriting commissions and offering costs incurred in connection with all common equity offerings, including any potential issuances under Piedmont's ATM Program, are reflected as a reduction of additional paid-in capital.

Dividends

As a REIT, Piedmont is required by the Internal Revenue Code of 1986, as amended (the “Code”), to make distributions to stockholders each taxable year equal to at least 90% of its annual taxable income, computed without regard to the dividends-paid deduction and by excluding net capital gains attributable to stockholders (“REIT taxable income”). Historically, Piedmont sponsored a dividend reinvestment plan ("DRP") pursuant to which common stockholders could elect (if their brokerage agreements allowed) to reinvest an amount equal to the dividends declared on their common shares into additional shares of Piedmont’s common stock in lieu of receiving cash dividends. Under the DRP, Piedmont has the option to either issue shares purchased in the open market or issue shares directly from Piedmont's authorized but unissued shares, in both cases at a 2% discount for the stockholder. Such election took place at the settlement of each quarterly and/or special dividend in which there were participants in the DRP. On February 19, 2020, the Board of Directors suspended the company-funded DRP offered through our transfer agent effective March 21, 2020.

Noncontrolling Interest

Noncontrolling interest is the equity interest of consolidated entities that is not owned by Piedmont. Noncontrolling interest is adjusted for the noncontrolling partners' share of contributions, distributions, and earnings (losses) in accordance with the respective partnership agreement. Earnings allocated to such noncontrolling partners are recorded as income applicable to noncontrolling interest in the accompanying consolidated statements of income.

Revenue Recognition

Piedmont's revenues consist of the following:

Rental and tenant reimbursement income - consists of revenue from leases with Piedmont's tenants, as well as reimbursements for services prescribed by such leases. Piedmont evaluates contracts at commencement to determine if the contract contains a lease. If a contract is determined to contain a lease, the lease is evaluated to determine whether it is an operating, sales-type, or a direct financing lease. All of Piedmont's leases where Piedmont is the lessor are for the lessee's use of space in Piedmont's commercial office properties and are classified as operating leases.

In most lease arrangements, Piedmont finances improvements to leased space and is deemed the owner of the tenant improvements. The determination of who owns the improvements, whether payments to tenants constitute lease incentives or tenant improvements, and the timing of revenue recognition requires the exercise of significant judgment based on the facts and circumstances of the specific lease arrangement and is not based on any one factor. When evaluating whether Piedmont or its tenant owns the improvements, management considers a number of factors, including, among other things:

•whether the tenant is obligated by the terms of the lease agreement to construct or install the leasehold improvements as a condition of the lease;

•whether the landlord can require the lessee to make specified improvements or otherwise enforce its economic rights to those assets;

•whether the tenant is required to provide the landlord with documentation supporting the cost of tenant improvements prior to reimbursement by the landlord;

•whether the landlord is obligated to fund cost overruns for the construction of leasehold improvements;

•whether the leasehold improvements are unique to the tenant or could reasonably be used by other parties; and

•whether the estimated economic life of the leasehold improvements is long enough to allow for a significant residual value that could benefit the landlord at the end of the lease term.

These tenant improvements are recorded as capital assets by Piedmont and depreciated, typically over the lease term. Payments made by the tenants for tenant improvements owned by Piedmont are treated as deferred revenues and amortized into rental and tenant reimbursement revenue over the lease term.

The timing of rental revenue recognition is largely dependent on our conclusion as to whether Piedmont, or its tenant, is the owner of tenant improvements at the leased property. When Piedmont owns the tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the finished space, which is typically when the improvements being recorded as Piedmont's asset are substantially complete. In some instances, Piedmont may cede control of the leased space to the tenant to be responsible for tenant-owned improvements for the space. In such arrangements, payments made by Piedmont to its tenant are treated as lease incentives, amortized as a reduction to rental and tenant reimbursement revenue over the lease term, which typically begins once the tenant takes possession of the unimproved space.

Lease payments are typically comprised of both fixed base rental payments and separately billed variable lease payments for reimbursement of services performed by Piedmont for the tenant as prescribed by the lease. Fixed base rental payments, as well as any fixed portion of reimbursement income, are recognized on a straight-line basis over the lease term. Tenant reimbursements are recognized as revenue in the period that the related operating cost is incurred. Rents and tenant reimbursements collected in advance are recorded as deferred income in the accompanying consolidated balance sheets.

Property management fee revenue - consists of revenue earned by Piedmont related to operating and managing office properties owned by other third-parties. Such income is within the scope of ASC 606, Revenue from Contracts with Customers ("ASC 606"). Because property management services represent a performance obligation that are satisfied over the length of the contract, not at any specific point in time, and have the same measure of transfer (time elapsed), property management fee revenue is recognized over time. Any variable consideration transferred as part of these management agreements is recognized in the quarter that the underlying cash receipts are collected, consistent with the allocation objective of allocating the transaction price in an amount that depicts the amount of consideration to which Piedmont expects to be entitled in exchange for transferring the promised service to the customer.

Other property related income - consists of all other property related income from Piedmont's customers (tenants) that is not derived from a contract meeting the definition of a lease and is therefore also within the scope of ASC 606. Examples of such income include parking revenue and income from licenses with unrelated third-parties to place antennae and/or fiber optic cables in or on Piedmont's buildings. These services also represent a performance obligation that is satisfied over the length of the contract, not at any specific point in time, and has the same measure of transfer (time elapsed); therefore, revenue related to these licenses is also recognized over time.

Gains on the sale of real estate assets, like all non-lease related revenue, are subject to a five-step model requiring that Piedmont identify the contract with the customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract, and recognize revenue upon satisfaction of the performance obligations. In circumstances where Piedmont contracts to sell a property with material post-sale involvement, such involvement must be accounted for as a separate performance obligation in the contract and a portion of the sales price allocated to each performance obligation. When the post-sale involvement performance obligation is satisfied, the portion of the sales price allocated to it will be recognized as gain on sale of real estate assets. Property dispositions with no continuing involvement will continue to be recognized upon closing of the sale.

Stock-based Compensation

Piedmont has issued stock-based compensation in the form of restricted stock to its employees and directors. For employees, such compensation has been issued pursuant to Piedmont's Long-term Incentive Compensation ("LTIC") program. The LTIC program is comprised of an annual restricted stock grant component (the "Restricted Stock Award" program) and a multi-year performance share component (the "Performance Share" program). Awards granted pursuant to the Restricted Stock Award and Performance Share programs, as well as director's awards, are classified as equity awards or liability awards based on the underlying terms of the program agreement. Awards classified as equity awards are expensed straight-line over the vesting period, with issuances recorded as a reduction to additional paid in capital. Forfeitures are recorded when they occur. Awards classified as liability awards are remeasured at each reporting period over the service period, with issuances recorded as a reduction to accrued expense. The compensation expense recognized related to both of these award types is recorded as property operating costs for those employees whose job is related to property operations and as general and administrative expense for all other employees and directors in the accompanying consolidated statements of income.

Non-qualified Deferred Compensation Plan

Piedmont previously offered a non-qualified deferred compensation plan ("NQDC Plan") to certain employees which allowed the employee to elect to defer receipt of compensation, including both cash and stock-based compensation, until future taxable years. As of December 31, 2019, Piedmont suspended the NQDC Plan so that no additional amounts may be deferred. Amounts deferred prior to the suspension of the NQDC Plan are invested in trading securities held in a "rabbi trust" and are measured using quoted market prices as of the reporting date, with changes in fair value recognized in net income. As of December 31, 2019 and 2018, Piedmont held approximately $0.6 million and $0.4 million, respectively, of these trading securities. Such investments are included in cash equivalents due to their short-term, liquid nature, with the corresponding liability included in accounts payable, accrued expenses, and accrued capital expenditures in the accompanying consolidated balance sheets.

Net Income Available to Common Stockholders Per Share

Net income per share-basic is calculated as net income available to common stockholders divided by the weighted average number of common shares outstanding during the period. Net income per share-diluted is calculated as net income available to common stockholders divided by the diluted weighted average number of common shares outstanding during the period, including the dilutive effect of nonvested restricted stock. The dilutive effect of nonvested restricted stock is calculated using the treasury stock method to determine the number of additional common shares that would become outstanding if the remaining unvested restricted stock awards vested. Further, Piedmont has elected to use the "end of the reporting period" convention when using the treasury stock method to calculate the dilutive effect of any shares issued pursuant to forward equity sale agreements in connection with Piedmont's ATM Program described above. Under this methodology, the assumed sale proceeds are calculated using the closing price of Piedmont's stock as of the end of the respective reporting period.

Income Taxes

Piedmont has elected to be taxed as a REIT under the Code, and has operated as such, beginning with its taxable year ended December 31, 1998. To qualify as a REIT, Piedmont must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its annual REIT taxable income. As a REIT, Piedmont is generally not subject to federal income taxes, subject to fulfilling, among other things, its taxable income distribution requirement. However, Piedmont is subject to federal income taxes related to the operations conducted by its taxable REIT subsidiary, POH, which have been provided for in the financial statements. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to POH. POH does not have significant tax provisions or deferred income tax items. These operations resulted in approximately $160,000, $(97,000), and $13,000 in income tax expense/(recoveries) for the years ended December 31, 2019, 2018, and 2017, respectively, as a component of other income/(expense) in the accompanying consolidated statements of income. Further, Piedmont is subject to certain state and local taxes related to the operations of properties in certain locations, which have been provided for in general and administrative expenses in the accompanying consolidated financial statements.

Accounting Pronouncements Adopted during the Year Ended December 31, 2019

Leases

During the year ended December 31, 2019, Piedmont adopted ASU No. 2016-02, Leases (Topic 842), as well as various associated updates and amendments, which together comprise the requirements for lease accounting under ASC 842. ASC 842 fundamentally changed the definition of a lease, as well as the accounting for operating leases, by requiring lessees to recognize

a liability to make lease payments and a right-of-use asset representing the right to use the leased asset over the term of the lease. ASC 842 also prohibits the capitalization of internal direct salary costs associated with negotiating and executing leases. Accounting for leases by lessors is substantially unchanged from prior practice as lessors continue to recognize lease revenue on a straight-line basis.

In conjunction with the adoption of ASC 842, Piedmont adopted the following optional practical expedients, transition amendments, or made accounting policy elections as follows:

•a package of optional practical expedients which precluded: (1) the reassessment of any expired or existing contracts to determine if they contain a lease or to determine lease classification; and (2) the write-off of any unamortized, previously capitalized, initial direct costs for any existing leases;

•an optional practical transition expedient provided by ASU No. 2018-01 which allowed Piedmont to exclude certain land easements in place as of January 1, 2019 from the new guidance;

•an optional practical expedient provided by ASU No. 2018-11 which allowed certain non-lease operating expense reimbursements which are included in the underlying stated lease rate to be accounted for as part of an operating lease where Piedmont is the lessor;

•a transitional amendment which allowed for the presentation of comparative periods in the year of adoption under ASC 840 (the former leasing guidance), effectively allowing for an initial adoption of ASC 842 (the new leasing guidance) on January 1, 2019 (the "Comparatives Under ASC 840 Option");

•an accounting policy election allowed by ASC 842 related to a recognition and measurement exception for short-term leases (defined as leases which are 12 months or less in duration) where Piedmont is the lessee. Piedmont's short-term lease expense reasonably reflects its lease commitments under such leases; and

•an accounting policy election allowed by ASU No. 2018-20 which permits Piedmont to exclude sales and other similar taxes from analysis to ascertain whether they are Piedmont's primary obligation (as lessor), and instead exclude such costs from revenue and account for them as costs of the lessee.

The nature of Piedmont's change in accounting principle relates primarily to its accounting for operating leases where Piedmont is a lessee for office space, as prescribed by ASC 842. Due to the adoption of the practical expedients outlined above, Piedmont has not adjusted prior-period information retrospectively, and there is a negligible decrease in net income attributable to Piedmont as a result of accounting for leases where Piedmont is the lessee under ASC 842 as compared to prior operating lease accounting.

As required under the Comparatives Under ASC 840 Option described above, Piedmont's future minimum rental income from lessees under non-cancelable operating leases where Piedmont was the lessor as of December 31, 2018 is presented below (in thousands):


Years ending December 31:
2019	$	370,495
2020	352,541
2021	337,951
2022	324,960
2023	291,603
Thereafter	1,247,649
Total	$	2,925,199

Stock Compensation to Non-employees

During the year ended December 31, 2019, Piedmont adopted ASU No. 2018-07, Stock Compensation (Topic 718), Improvements to Non-employee Share-Based Payment Accounting ("ASU 2018-07"). The provisions of ASU 2018-07 align accounting for stock based compensation for non-employees for goods and services with existing accounting for similar compensation for employees. ASU 2018-07 requires an entity to remeasure liability-classified awards that have not been settled by the date of adoption and equity-classified awards for which a measurement date has not been established through a cumulative-effect adjustment to retained earnings as of January 1, 2019. Piedmont's only awards affected by ASU 2018-07 are equity-classified award grants to its independent board of directors, which have been historically recognized in the same

manner prescribed by the newly adopted standard. As such, there was no cumulative effect adjustment recognized upon adoption.

Reclassifications

Although Piedmont has adopted the transitional amendment under ASC 842 described above, Piedmont has combined the presentation of rental income and tenant reimbursements in the accompanying consolidated statements of income for the prior periods to conform to the current period financial presentation under presentation guidance detailed in ASC 205 Presentation of Financial Statements. These amounts included the presentation of approximately $411.7 million of rental income and $92.7 million of tenant reimbursements for the year ended December 31, 2018 as rental and tenant reimbursement revenue of $504.4 million. Additionally, Piedmont presents approximately $455.1 million of rental income and $98.2 million of tenant reimbursements for the year ended December 31, 2017 as rental and tenant reimbursement revenue of $553.3 million. Further, the subtotal of Revenues less Expenses was removed within the accompanying consolidated statements of income for the years ended December 31, 2018 and 2017, respectively, to correct the prior period presentation. Finally, certain prior period amounts presented in the accompanying consolidated statements of income for the year ended December 31, 2017 were reclassified during the year ended December 31, 2018 to conform to the current period financial statement presentation. These amounts included: (i) the reclassification of approximately $19.2 million of parking, antennae license and fiber income that was previously included in rental and tenant reimbursement revenue into other property related income, as well as certain other miscellaneous revenue into rental and tenant reimbursement revenue and/or property management fee revenue in conjunction with the adoption of ASC 606 Revenue from Contracts with Customers; and (ii) the reclassification of $1.8 million of expense related to certain regional employees who are primarily engaged in the operation and management of properties that was previously included in general and administrative expense to property operating costs.

Other Recent Accounting Pronouncements

The FASB has issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments, as well as ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, and ASU No. 2019-05, Financial Instruments- Credit Losses: Targeted Transition Relief (collectively the "Credit Loss Amendments"). The provisions of the Credit Loss Amendments replace the "incurred loss" approach with an "expected loss" model for impairing trade and other receivables, held-to-maturity debt securities, net investment in leases, and off-balance-sheet credit exposures, which will generally result in earlier recognition of allowances for credit losses. Additionally, the provisions change the classification of credit losses related to available-for-sale securities to an allowance, rather than a direct reduction of the amortized cost of the securities. Further, the FASB has issued ASU No. 2018-19 Codification Improvements to Topic 326, Financial Instruments - Credit Losses, which is effective concurrent with the Credit Loss Amendments, and excludes receivables arising from operating leases from the scope of the Credit Loss Amendments. Both ASU 2018-19 and the Credit Loss Amendments are effective in the first quarter of 2020, with early adoption permitted as of January 1, 2019. Piedmont is currently evaluating the potential impact of adoption; however, substantially all of Piedmont's receivables are operating lease receivables and as such, Piedmont does not anticipate any material impact to its consolidated financial statements as a result of adoption of the Credit Loss Amendments and ASU 2018-19.

Acquisitions

12 Months Ended

Dec. 31, 2019

Business Combinations [Abstract]

Acquisitions

During the year ended December 31, 2019, Piedmont acquired the following separately identifiable assets using proceeds available as a result of dispositions (see Note 13), proceeds from the $500 Million Unsecured 2018 Line of Credit, and cash on hand, as noted below:


Property	Metropolitan Statistical Area	Date of Acquisition	Ownership Percentage Acquired		Rentable Square Feet (Unaudited)	Percentage Leased as of Acquisition (Unaudited)			Net Contractual Purchase Price (in millions) ⁽¹⁾
Galleria 100	Atlanta, Georgia	May 6, 2019	100	%	414,293	91	%		$	95.1
Galleria 400 and 600	Atlanta, Georgia	August 23, 2019	100	%	863,623	84	%	⁽²⁾	$	231.2

⁽¹⁾Price for both acquisitions includes the purchase of adjacent parcels of developable land, totaling approximately 11.7 acres.

⁽²⁾Represents weighted-average leased percentage at acquisition of the Galleria 400 and 600 buildings.

Debt

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Debt

The following table summarizes the terms of Piedmont’s indebtedness outstanding as of December 31, 2019 and 2018, including net discounts/premiums and unamortized debt issuance costs (in thousands):


Facility ⁽¹⁾	Stated Rate		Effective Rate ⁽²⁾			Maturity		Amount Outstanding as of
												2019	2018
Secured (Fixed)







$35 Million Fixed-Rate Loan ⁽³⁾	5.55	%	3.75	%		9/1/2021		$	28,687	$	29,706
$160 Million Fixed-Rate Loan ⁽⁴⁾	3.48	%	3.58	%		7/5/2022		160,000		160,000
Net premium and unamortized debt issuance costs								343		645
Subtotal/Weighted Average ⁽⁵⁾	3.79	%						189,030		190,351
Unsecured (Variable and Fixed)





Amended and Restated $300 Million Unsecured 2011 Term Loan	LIBOR + 1.00%		3.20	%	⁽⁷⁾	11/30/2021		300,000		300,000.0
$500 Million Unsecured 2018 Line of Credit ⁽⁶⁾	LIBOR + 0.90%		2.70	%		9/30/2022	⁽⁸⁾	—		205,000
$350 Million Unsecured Senior Notes	3.40	%	3.43	%		6/01/2023		350,000		350,000
$400 Million Unsecured Senior Notes	4.45	%	4.10	%		3/15/2024		400,000		400,000
$250 Million Unsecured 2018 Term Loan	LIBOR + 1.60%		3.83	%	⁽⁹⁾	3/31/2025		250,000		250,000
Discounts and unamortized debt issuance costs								(7,626)		(9,879)
Subtotal/Weighted Average ⁽⁵⁾	3.76	%						1,292,374		1,495,121
Total/Weighted Average ⁽⁵⁾	3.76	%						$	1,481,404	$	1,685,472

⁽¹⁾Other than the $35 Million Fixed-Rate Loan, all of Piedmont’s outstanding debt as of December 31, 2019 and 2018 is interest-only until maturity.

⁽²⁾Effective rate after consideration of settled or in-place interest rate swap agreements, issuance premiums/discounts, and/or fair market value adjustments upon assumption of debt.

⁽³⁾Collateralized by the 5 Wall Street building in Burlington, Massachusetts.

⁽⁴⁾Collateralized by the 1901 Market Street building in Philadelphia, Pennsylvania.

⁽⁵⁾Weighted average is based on contractual balance of outstanding debt and the stated or effectively fixed interest rates as of December 31, 2019.

⁽⁶⁾On a periodic basis, Piedmont may select from multiple interest rate options, including the prime rate and various-length LIBOR

locks on all or a portion of the principal. All LIBOR selections are subject to an additional spread over the selected rate based on

Piedmont’s current credit rating.

⁽⁷⁾The facility has a stated variable rate; however, Piedmont has entered into interest rate swap agreements which effectively fix, exclusive of changes in Piedmont's credit rating, the rate to that shown as the effective rate through the maturity date of the interest rate swap agreements (see Note 5 for more detail).

⁽⁸⁾Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of September 29, 2023) provided Piedmont is not then in default and upon payment of extension fees.

⁽⁹⁾The facility has a stated variable rate; however, Piedmont has entered into interest rate swap agreements which effectively fix, exclusive of changes to Piedmont's credit rating, $150 million of the principal balance to 4.11% through March 29, 2020, and $100 million of the principal balance to 4.21% from March 30, 2020 through the maturity date of the loan. For the remaining variable portion of the loan, Piedmont may periodically select from multiple interest rate options, including the prime rate and various-length LIBOR locks on all or a portion of the principal. All LIBOR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating. The rate presented is the weighted-average rate for the effectively fixed and variable portions of the debt outstanding as of December 31, 2019 (see Note 5 for more detail).

A summary of Piedmont's consolidated principal outstanding for aggregate debt maturities of its indebtedness as of December 31, 2019, is provided below (in thousands):


2020	$	985
2021	327,702
2022	160,000
2023	350,000
2024	400,000
Thereafter	250,000
Total	$	1,488,687

Piedmont’s weighted-average interest rate as of December 31, 2019 and 2018, for the aforementioned borrowings was approximately 3.76% in both periods. Piedmont made interest payments on all indebtedness, including interest rate swap cash settlements, of approximately $64.0 million, $63.1 million, and $67.6 million during the years ended December 31, 2019, 2018, and 2017, respectively. Also, Piedmont capitalized interest of approximately $2.1 million, $1.4 million, and $0.2 million for the years ended December 31, 2019, 2018, and 2017, respectively. As of December 31, 2019, Piedmont believes it was in compliance with all financial covenants associated with its debt instruments. See Note 6 for a description of Piedmont’s estimated fair value of debt as of December 31, 2019.

Derivative Instruments

12 Months Ended

Dec. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Risk Management Objective of Using Derivatives

In addition to operational risks which arise in the normal course of business, Piedmont is exposed to economic risks such as interest rate, liquidity, and credit risk. In certain situations, Piedmont has entered into derivative financial instruments such as interest rate swap agreements and other similar agreements to manage interest rate risk exposure arising from current or future variable rate debt transactions. Interest rate swap agreements involve the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. Piedmont’s objective in using interest rate derivatives is to add stability to interest expense and to manage its exposure to interest rate movements.

Cash Flow Hedges of Interest Rate Risk

Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for Piedmont making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

In January 2018, Piedmont repaid the $300 Million Unsecured 2013 Term Loan in advance of its maturity without penalty. In connection with this early debt prepayment, six interest rate swap agreements which were identified as cash flow hedges were also terminated, resulting in a receipt of approximately $0.8 million from Piedmont's counterparties for the settlement of the swaps. These proceeds were recorded in accumulated other comprehensive income/(loss) ("OCI") and were amortized as an offset to interest expense in the consolidated statement of income over the original term of the terminated interest rate swaps through January 2019. In connection with this termination Piedmont also recognized a non-cash loss of approximately $1.3 million due to it becoming probable that the hedged forecasted transactions would not occur, offset by a mark-to-market gain on these cash flow hedges of approximately $0.1 million for the year ended December 31, 2018.

As of December 31, 2019, Piedmont was party to interest rate swap agreements, all of which are designated as effective cash flow hedges and fully hedge the variable cash flows covering the entire outstanding balance of the Amended and Restated $300 Million Unsecured 2011 Term Loan, and $150 million of the $250 Million Unsecured 2018 Term Loan. The maximum length of time over which Piedmont is hedging its exposure to the variability in future cash flows for forecasted transactions is 63 months.

A detail of Piedmont’s interest rate derivatives outstanding as of December 31, 2019 is as follows:

Interest Rate Derivatives:

Number of Swap Agreements

Associated Debt Instrument

Notional Amount
(in millions)

Effective Date

Maturity Date

Interest rate swaps

Amended and Restated $300 Million Unsecured 2011 Term Loan

300

11/22/2016

1/15/2020

Interest rate swaps

$250 Million Unsecured 2018 Term Loan

100

3/29/2018

3/31/2025

Interest rate swaps

$250 Million Unsecured 2018 Term Loan

3/29/2018

3/29/2020

Total

450

Piedmont presents its interest rate derivatives on its consolidated balance sheets on a gross basis as interest rate swap assets and interest rate swap liabilities. A detail of Piedmont’s interest rate derivatives on a gross and net basis as of December 31, 2019 and 2018, respectively, is as follows (in thousands):


Interest rate swaps classified as:	December 31, 2019		December 31, 2018
Gross derivative assets	$	—	$	1,199
Gross derivative liabilities	(5,121)		(839)
Net derivative asset/(liability)	$	(5,121)	$	360

The gain/(loss) on Piedmont's interest rate derivatives, including previously settled forward swaps, that was recorded in OCI and the accompanying consolidated statements of income as a component of interest expense for the years ended December 31, 2019, 2018, and 2017, respectively, was as follows (in thousands):


Interest Rate Swaps in Cash Flow Hedging Relationships:	2019		2018		2017
Amount of gain/(loss) recognized in OCI	$	(5,659)	$	692	$	2,479
Amount of previously recorded gain/(loss) reclassified from OCI into Interest Expense	$	1,836	$	1,558	$	(3,502)
Amount of loss recognized on derivatives reclassified from OCI into Loss on Extinguishment of Debt	$	—	$	(1,258)	$	—

Total amount of Interest Expense presented in the consolidated statements of income	$	(61,594)	$	(61,023)	$	(68,124)
Total amount of Loss on Extinguishment of Debt presented in the consolidated statements of income ⁽¹⁾	$	—	$	(1,680)	$	—

⁽¹⁾Includes the write-off of approximately $0.4 million of discounts and unamortized debt issuance costs associated with the repayment of the $300 Million Unsecured 2013 Term Loan in January 2018.

Piedmont estimates that approximately $0.3 million will be reclassified from OCI as a reduction to interest expense over the next twelve months. Piedmont did not recognize any hedge ineffectiveness on its cash flow hedges during the three years ended December 31, 2019.

See Note 6 for fair value disclosures of Piedmont's derivative instruments.

Credit-risk-related Contingent Features

Piedmont has agreements with its derivative counterparties that contain a provision whereby if Piedmont defaults on any of its indebtedness, including a default where repayment of the indebtedness has not been accelerated by the lender, then Piedmont could also be declared in default on its derivative obligations. If Piedmont were to breach any of the contractual provisions of the derivative contracts, it could be required to settle its liability obligations under the agreements at their termination value of the estimated fair values plus accrued interest, or approximately $5.3 million as of December 31, 2019. Additionally, Piedmont has rights of set-off under certain of its derivative agreements related to potential termination fees and amounts payable under the agreements, if a termination were to occur.

Fair Value Measurements of Financial Instruments

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements of Financial Instruments

Piedmont considers its cash and cash equivalents, tenant receivables, restricted cash and escrows, accounts payable and accrued expenses, interest rate swap agreements, and debt to meet the definition of financial instruments. The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments, as well as its level within the GAAP fair value hierarchy, as of December 31, 2019 and 2018, respectively (in thousands):


	December 31, 2019									December 31, 2018
Financial Instrument	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy
Assets:
Cash and cash equivalents ⁽¹⁾	$	13,545	$	13,545	Level 1	$	4,571	$	4,571	Level 1
Tenant receivables, net ⁽¹⁾	$	8,226	$	8,226	Level 1	$	10,800	$	10,800	Level 1

Restricted cash and escrows ⁽¹⁾	$	1,841	$	1,841	Level 1	$	1,463	$	1,463	Level 1
Interest rate swaps	$	—	$	—	Level 2	$	1,199	$	1,199	Level 2
Liabilities:
Accounts payable and accrued expenses ⁽¹⁾	$	50,049	$	50,049	Level 1	$	47,328	$	47,328	Level 1
Interest rate swaps	$	5,121	$	5,121	Level 2	$	839	$	839	Level 2
Debt, net	$	1,481,404	$	1,536,687	Level 2	$	1,685,472	$	1,698,213	Level 2

⁽¹⁾For the periods presented, the carrying value of these financial instruments approximates estimated fair value due to its short-term maturity.

Piedmont's debt was carried at book value as of December 31, 2019 and 2018; however, Piedmont's estimate of its fair value is disclosed in the table above. Piedmont uses widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the debt facilities, including the period to maturity of each instrument, and uses observable market-based inputs for similar debt facilities which have transacted recently in the market. Therefore, the estimated fair values determined are considered to be based on significant other observable inputs (Level 2). Scaling adjustments are made to these inputs to make them applicable to the remaining life of Piedmont's outstanding debt. Piedmont has not changed its valuation technique for estimating the fair value of its debt.

Piedmont’s interest rate swap agreements presented above, and as further discussed in Note 5, are classified as “Interest rate swap” assets and liabilities in the accompanying consolidated balance sheets and were carried at estimated fair value as of December 31, 2019 and 2018. The valuation of these derivative instruments was determined using widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the derivatives, including the period to maturity of each instrument, and uses observable market-based inputs, including interest rate curves and implied volatilities. Therefore, the estimated fair values determined are considered to be based on significant other observable inputs (Level 2). In addition, Piedmont considered both its own and the respective counterparties’ risk of nonperformance in determining the estimated fair value of its derivative financial instruments by estimating the current and potential future exposure under the derivative financial instruments that both Piedmont and the counterparties were at risk for as of the valuation date. The credit risk of Piedmont and its counterparties was factored into the calculation of the estimated fair value of the interest rate swaps; however, as of December 31, 2019 and 2018, this credit valuation adjustment did not comprise a material portion of the estimated fair value. Therefore, Piedmont believes that any unobservable inputs used to determine the estimated fair values of its derivative financial instruments are not significant to the fair value measurements in their entirety, and does not consider any of its derivative financial instruments to be Level 3 assets or liabilities.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Impairment Loss on Real Estate Assets

12 Months Ended

Dec. 31, 2019

Real Estate [Abstract]

Impairment Loss on Real Estate Assets

Piedmont recorded the following impairment losses on real estate assets for the years ended December 31, 2019, 2018, and 2017 (in thousands):


	2019		2018		2017





The Dupree⁽¹⁾	$	1,953	$	—	$	—
600 Corporate Drive⁽²⁾	7,000		—		—
Disposal Group of 13 Assets⁽¹⁾	—		—		46,461
Total impairment loss on real estate assets	$	8,953	$	—	$	46,461

⁽¹⁾The impairment loss recognized was the result of reducing the asset's carrying value to reflect its fair value, estimated based on the net contract price negotiated with a unrelated, third-party purchaser.

⁽²⁾Management shortened the intended hold period for the property, and in doing so determined that the carrying value would not be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition. As a result, Piedmont recognized a loss on impairment calculated as the difference between the carrying value of the asset and the estimated fair value. The estimated fair value was determined using widely available market quotations for similar properties, as well as discounted cash flow analysis. Key assumptions used in the analysis were a capitalization and discount rate of 14% and estimated selling costs of 0.75%.

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Under Existing Lease Agreements As a recurring part of its business, Piedmont is typically required under its executed lease agreements to fund tenant improvements, leasing commissions, and building improvements. In addition, certain agreements contain provisions that require Piedmont to issue corporate or property guarantees to provide funding for capital improvements or other financial obligations. As of December 31, 2019, Piedmont had one individually significant unrecorded tenant allowance commitment of approximately $57.4 million for the approximately 20-year, approximately 520,000 square foot renewal and expansion on behalf of Piedmont's largest tenant, the State of New York at the 60 Broad Street building in New York City. These commitments will be accrued and capitalized as the related expenditures are incurred. Contingencies Related to Tenant Audits/Disputes Certain lease agreements include provisions that grant tenants the right to engage independent auditors to audit their annual operating expense reconciliations. Such audits may result in different interpretations of language in the lease agreements from that made by Piedmont, which could result in requests for refunds of previously recognized tenant reimbursement revenues, resulting in financial loss to Piedmont. Piedmont recorded net recoveries of previously recognized reductions in rental and reimbursement revenues of $0.6 million related to tenant audits/disputes during the year ended December 31, 2019 and approximately $0.5 million and $0.3 million of reductions in rental and reimbursement revenues related to such tenant audits/disputes during the years ended December 31, 2018, and 2017, respectively. Litigation Piedmont is from time to time a party to legal proceedings, which arise in the ordinary course of its business. None of these ordinary course legal proceedings are reasonably likely to have a material adverse effect on results of operations or financial condition. Piedmont is not aware of any such legal proceedings contemplated by governmental authorities.

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2019
Related Party Transactions [Abstract]
Related-Party Transactions	Related-Party TransactionsDuring the year ended December 31, 2019, Piedmont entered into employment or retirement agreements with certain of its current and former executive officers as more fully described in its Definitive Proxy Statement and Current Report on Form 8-K filed on March 19, 2019. Further, during the years ended December 31, 2019, 2018, and 2017, Piedmont recognized approximately $0.2 million, $0.3 million, and $0.1 million, respectively, of expense related to a consulting agreement with its former Chief Investment Officer. There were no other related-party transactions during the three years ended December 31, 2019.

Stock Based Compensation

12 Months Ended

Dec. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Based Compensation

Deferred Stock Awards

The Compensation Committee of Piedmont's Board of Directors has periodically granted deferred stock award units to all of Piedmont's employees and independent directors. Employee awards typically vest ratably over a multi-year period and independent director awards vest over one year. Certain management employees' long-term equity incentive program is split equally between the time-vested award units and a multi-year performance share program whereby the actual awards are contingent upon Piedmont's total stockholder return ("TSR") relative to a peer group of office REITs' TSR. The long-term equity incentives for these certain employees, as well as the peer group, is predetermined by the Board of Directors, advised by an outside compensation consultant. Any shares earned are awarded at the end of the multi-year performance period and vest upon award. The fair values of the multi-year performance share awards are estimated using a Monte Carlo valuation method.

A rollforward of Piedmont's equity based award activity for the year ended December 31, 2019 is as follows:


	Shares		Weighted-Average Grant Date Fair Value
Unvested and Potential Stock Awards as of December 31, 2018	1,227,483		$	23.14
Deferred Stock Awards Granted	354,057		$	21.02
Increase in Estimated Potential Share Awards based on Performance	271,450		$	28.34
Performance Stock Awards Vested	(352,404)	⁽¹⁾	$	25.83
Deferred Stock Awards Vested	(440,450)	⁽¹⁾	$	19.66
Deferred Stock Awards Forfeited	(15,116)		$	19.19
Unvested and Potential Stock Awards as of December 31, 2019	1,045,020		$	25.15

⁽¹⁾Includes performance share and deferred stock awards that were settled in cash in July 2019 in conjunction with the senior

management transition that occurred on June 30, 2019.

The following table provides additional information regarding stock award activity during the years ended 2019, 2018, and 2017 (in thousands except for per share amounts):


	2019		2018		2017
Weighted-Average Grant Date Fair Value of Deferred Stock Granted During the Period	$	21.02	$	17.84	$	21.38
Total Grant Date Fair Value of Deferred Stock Vested During the Period	$	8,658	$	6,378	$	5,899
Share-based Liability Awards Paid During the Period ⁽¹⁾	$	6,683	$	2,947	$	2,877

⁽¹⁾Amounts reflect the issuance of performance share awards related to the 2016-18, 2015-17, and 2014-16 Performance Share Plans during the years ended December 31, 2019, 2018, and 2017 respectively, as well as performance share award liabilities settled in cash in July 2019 for retirement and separation associated with the senior management transition on June 30, 2019.

A detail of Piedmont’s outstanding employee deferred stock awards as of December 31, 2019 is as follows:


Date of grant	Type of Award	Net Shares Granted ⁽¹⁾	Grant Date Fair Value		Vesting Schedule	Unvested and Potential Shares as of December 31, 2019













May 18, 2017	Deferred Stock Award	196,036	$	21.38	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 18, 2018, 2019, and 2020, respectively.	40,871
May 18, 2017	Fiscal Year 2017-2019 Performance Share Program	—	$	30.45	Shares awarded, if any, will vest immediately upon determination of award in 2020.	153,368	⁽²⁾

May 17, 2018	Deferred Stock Award	271,169	$	17.84	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 17, 2019, 2020, and 2021, respectively.	108,031
May 17, 2018	Fiscal Year 2018-2020 Performance Share Program	—	$	23.52	Shares awarded, if any, will vest immediately upon determination of award in 2021.	200,674	⁽²⁾
May 15, 2019	Deferred Stock Award-Board of Directors	25,974	$	20.79	Of the shares granted, 100% will vest by May 15, 2020.	25,974
May 3, 2019	Deferred Stock Award	300,825	$	21.04	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 3, 2020, 2021, and 2022, respectively.	194,816
May 3, 2019	Fiscal Year 2019-2021 Performance Share Program	—	$	29.43	Shares awarded, if any, will vest immediately upon determination of award in 2022.	321,286	⁽²⁾

Total						1,045,020

⁽¹⁾Amounts reflect the total grant to employees and independent directors, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2019.

⁽²⁾Estimated based on Piedmont's cumulative TSR for the respective performance period through December 31, 2019. Share estimates are subject to change in future periods based upon Piedmont's relative performance compared to its peer group of office REITs' TSR.

During the years ended December 31, 2019, 2018, and 2017, Piedmont recognized approximately $15.1 million, $9.7 million and $9.5 million of compensation expense related to stock awards, of which approximately $13.6 million, $8.6 million and $7.7 million, related to the amortization of unvested shares, respectively. During the year ended December 31, 2019, a total of 292,675 shares were issued to employees. As of December 31, 2019, approximately $3.5 million of unrecognized compensation cost related to unvested, annual deferred stock awards remained, which Piedmont will record in its consolidated statements of income over a weighted-average vesting period of approximately one year.

Earnings Per Share

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Earnings Per Share

There are no adjustments to “Net income applicable to Piedmont” for the diluted earnings per share computations.

included in the calculation of diluted weighted average common shares. For each of the years ended December 31, 2019, 2018, and 2017, Piedmont excluded approximately 0.1 million of such anti-dilutive shares.

The following table reconciles the denominator for the basic and diluted earnings per share computations shown on the consolidated statements of income for the years ended December 31, 2019, 2018, and 2017, respectively (in thousands):


	2019	2018	2017
Weighted-average common shares—basic	125,709	130,161	145,044
Plus: Incremental weighted-average shares from time-vested deferred and performance stock awards	473	475	336
Weighted-average common shares—diluted	126,182	130,636	145,380

Operating Leases

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Operating Leases

Piedmont’s real estate assets are leased to tenants under operating leases for which the terms vary, including certain provisions to extend the lease term, options for early terminations subject to specified penalties, and other terms and conditions as negotiated. Piedmont retains substantially all of the risks and benefits of ownership of the real estate assets leased to tenants. Amounts required as security deposits vary depending upon the terms of the respective leases and the creditworthiness of the tenant; however, generally they are not significant. Exposure to credit risk is limited to the extent that tenant receivables exceed this amount. Security deposits liabilities related to tenant leases are included in accounts payable, accrued expenses, and accrued capital expenditures in the accompanying consolidated balance sheets.

The future minimum rental income from Piedmont’s investment in real estate assets under non-cancelable operating leases as of December 31, 2019 is presented below (in thousands):


Years ending December 31:
2020	$	384,891
2021	378,312
2022	362,977
2023	329,490
2024	287,755
Thereafter	1,520,051
Total	$	3,263,476

Piedmont recognized the following fixed and variable lease payments, which together comprised rental and tenant reimbursement revenue in the accompanying consolidated statements of income for the years ended December 31, 2019, 2018, and 2017, respectively, as follows (in thousands):


	2019		2018		2017
Fixed payments	$	418,246	$	411,667	$	455,125
Variable payments	93,659		92,743		98,139
Total Rental and Tenant Reimbursement Revenue	$	511,905	$	504,410	$	553,264

Operating leases where Piedmont is the lessee relate primarily to office space in buildings owned by third parties. Upon adoption of ASC 842 on January 1, 2019, Piedmont recorded a right to use asset and corresponding lease liability of approximately $0.2 million using Piedmont's incremental borrowing rate as the lease discount rate. For the year ended December 31, 2019, Piedmont recognized approximately $0.1 million of operating lease costs. As of December 31, 2019, the weighted-average lease term of Piedmont's right of use assets is two years, and the weighted-average discount rate is 3.35%.

Property Dispositions and Assets Held for Sale

12 Months Ended

Dec. 31, 2019

Discontinued Operations and Disposal Groups [Abstract]

Property Dispositions and Assets Held for Sale

Property Dispositions

None of Piedmont's property dispositions during the three years ended December 31, 2019 met the criteria to be reported as discontinued operations. The operational results and gain on sale of real estate assets are presented as continuing operations in the accompanying consolidated statements of income, unless otherwise indicated below. Details of such properties sold are presented below (in thousands):


Buildings Sold	Location	Date of Sale	Gain on Sale of Real Estate Assets			Net Sales Proceeds



















Sarasota Commerce Center II	Sarasota, Florida	June 16, 2017	$	6,493		$	23,090
Two Independence Square	Washington, D.C.	July 5, 2017	$	109,381	⁽¹⁾	$	352,428
8560 Upland Drive	Denver, Colorado	July 27, 2017	$	3,683		$	12,334	⁽²⁾
2017 Disposition Portfolio	Various⁽³⁾	January 4, 2018	$	45,275		$	419,644	⁽⁴⁾
800 North Brand Boulevard	Glendale, California	November 29, 2018	$	30,416		$	155,583
One Independence Square	Washington, D.C.	February 28, 2019	$	33,176		$	163,623
The Dupree	Atlanta, Georgia	September 4, 2019	$	—	⁽⁵⁾	$	12,631
500 West Monroe Street	Chicago, Illinois	October 28, 2019	$	157,739		$	408,851

⁽¹⁾Gain on sale of real estate assets during the year ended December 31, 2019 reflects an approximately $6.1 million adjustment of the gain on sale for the Two Independence Square building related to the reimbursement of certain previously disputed tenant improvement overages.

⁽²⁾Property was owned as part of an unconsolidated joint venture. As such, the gain on sale is presented as equity in income of unconsolidated joint ventures in the accompanying consolidated statement of income. Amounts shown above reflect Piedmont's approximately 72% ownership.

⁽³⁾The 2017 Disposition Portfolio is comprised of the following properties: Desert Canyon 300 in Phoenix, Arizona; Windy Point I & II in Schaumburg, Illinois; 2300 Cabot Drive in Lisle, Illinois; 1075 West Entrance Drive in Auburn Hills, Michigan; Auburn Hills Corporate Center in Auburn Hills, Michigan; 5301 Maryland Way in Brentwood, Tennessee; Suwanee Gateway One in Suwanee, Georgia; 5601 Hiatus Road in Tamarac, Florida; Piedmont Pointe I & II in Bethesda, Maryland; 1200 Crown Colony Drive in Quincy, Massachusetts; 2001 N.W. 64th Street in Fort Lauderdale, Florida, and 2120 West End Avenue in Nashville, Tennessee.

⁽⁴⁾Piedmont accepted a secured $3.2 million promissory note from the buyer for a portion of the sales price, which was subsequently paid in full by the borrower.

⁽⁵⁾As discussed in Note 7 above, Piedmont recognized an impairment loss prior to the sale of the property.

Assets Held for Sale

No properties met the criteria to be classified as held for sale as of December 31, 2019. However, during the fourth quarter of 2018, Piedmont entered into a binding, non-refundable contract with an unrelated third party buyer to sell the One Independence Square building, resulting in its reclassification as held for sale as of December 31, 2018. The sale closed on February 28, 2019. Additionally, during the year ended December 31, 2019, Piedmont reclassified the 500 West Monroe Street building as held for sale before its ultimate disposition on October 28, 2019. Therefore, the appropriate real estate related assets and liabilities related to One Independence Square and 500 West Monroe Street are classified as held for sale in the accompanying consolidated balance sheet as of December 31, 2018.

Details of amounts held for sale as of December 31, 2019 and 2018 are presented below (in thousands):


	December 31, 2019		December 31, 2018
Real estate assets held for sale, net:
Land	$	—	$	67,552
Building and improvements, less accumulated depreciation of $0 and $102,476 as of December 31, 2019, and 2018, respectively	—		261,463

Construction in progress	—		2,053
Total real estate assets held for sale, net	$	—	$	331,068

Other assets held for sale, net:
Straight-line rent receivables	$	—	$	36,584
Prepaid expenses and other assets	—		1,095
Deferred lease costs, less accumulated amortization of $0 and $9,138 as of December 31, 2019 and 2018, respectively	—		23,554

Total other assets held for sale, net	$	—	$	61,233

Other liabilities held for sale, net:
Accrued expenses	$	—	$	8,780

Supplemental Disclosures for the Statement of Consolidated Cash Flows

12 Months Ended

Dec. 31, 2019

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosures for the Statement of Consolidated Cash Flows

Certain noncash investing and financing activities for the years ended December 31, 2019, 2018, and 2017 (in thousands) are outlined below:


	2019		2018		2017
Accrued capital expenditures and deferred lease costs	$	38,366	$	10,854	$	11,276
Change in accrued dividends and discount on dividend reinvestments	$	(545)	$	(74,828)	$	71,267


Change in accrued share repurchases as part of an announced plan	$	(4,417)	$	3,140	$	1,276
Investment in consolidated joint venture	$	—	$	—	$	63,026

The following table provides a reconciliation of cash, cash equivalents, and restricted cash and escrows as presented in the accompanying consolidated statement of cash flows for the years ended December 31, 2019, 2018, and 2017 to the consolidated balance sheets for the respective period (in thousands):


	2019		2018		2017
Cash and cash equivalents, beginning of period	$	4,571	$	7,382	$	6,992
Restricted cash and escrows, beginning of period	1,463		1,373		1,212


Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows, beginning of period	$	6,034	$	8,755	$	8,204

Cash and cash equivalents, end of period	$	13,545	$	4,571	$	7,382
Restricted cash and escrows, end of period	1,841		1,463		1,373


Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows, end of period	$	15,386	$	6,034	$	8,755

Amounts in restricted cash and escrows typically represent escrow accounts for the payment of real estate taxes which are required under certain of Piedmont's debt agreements; earnest money deposited by a buyer to secure the purchase of one of our properties; or security or utility deposits held for tenants as a condition of their lease agreement.

Income Taxes

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

Piedmont’s income tax basis net income for the years ended December 31, 2019, 2018, and 2017, is calculated as follows (in thousands):


	2019		2018		2017
GAAP basis financial statement net income	$	229,261	$	130,296	$	133,564
Increase/(decrease) in net income resulting from:
Depreciation and amortization expense recognized for financial reporting purposes in excess of amounts recognized for income tax purposes	10,381		54,420		62,916
Rental income accrued for income tax purposes less than amounts for financial reporting purposes	(34,804)		(9,681)		(25,432)
Net amortization of above/below-market lease intangibles for income tax purposes in excess of amounts for financial reporting purposes	(7,698)		(7,453)		(6,041)
Gain on disposal of property for financial reporting purposes less than/(in excess of) amounts for income tax purposes	(85,463)		(36,241)		10,068
Taxable income or loss of Piedmont Washington Properties, Inc., in excess of/(less than) amount for financial reporting purposes	411		(2,089)		176
Other expenses, including impairment loss on real estate assets, for financial reporting purposes in excess of/ (less than) amounts for income tax purposes	23,127		(37,394)		49,859
Taxable income for POH in excess of/(less than) amount for financial reporting purposes	175		(64)		(28)
Income tax basis net income, prior to dividends paid deduction	$	135,390	$	91,794	$	225,082

For income tax purposes, dividends to common stockholders are characterized as ordinary income, capital gains, or as a return of a stockholder’s invested capital. The composition of Piedmont’s distributions per common share is presented below:


	2019		2018		2017
Ordinary income	29.82	%	100.00	%	53.61	%
Return of capital	—	%	—	%	—	%
Capital gains	70.18	%	—	%	46.39	%
	100	%	100	%	100	%

As of December 31, 2019 and 2018, the tax basis carrying value of Piedmont’s total assets was approximately $3.3 billion and $3.6 billion, respectively.

Approximately $1.0 million and $2.4 million of accrued interest and penalties related to uncertain tax positions was included in accounts payable, accrued expenses, and accrued capital expenditures in the accompanying consolidated balance sheets as of December 31, 2019 and 2018, respectively. Piedmont recognized approximately $1.4 million of recoveries of previously recorded estimated accrued interest and penalties for both of the years ended December 31, 2019 and 2018, and $0.1 million of recoveries for the year ended December 31, 2017, related to such positions. The tax years 2016 to 2018 remain open to examination by various federal and state taxing authorities.

Quarterly Results (unaudited)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results (unaudited)

A summary of the unaudited quarterly financial information for the years ended December 31, 2019 and 2018, is presented below (in thousands, except per-share data):


	2019
	First		Second		Third		Fourth
Revenues	$	132,936	$	130,668	$	135,421	$	134,153

Gain on sale of real estate assets	$	37,887	$	1,451	$	32	$	157,640
Net income	$	50,209	$	8,152	$	8,419	$	162,476

Net income applicable to Piedmont	$	50,208	$	8,153	$	8,422	$	162,478

Basic and diluted earnings per share	$	0.40	$	0.06	$	0.07	$	1.29
Dividends declared per share	$	0.21	$	0.21	$	0.21	$	0.21


	2018
	First		Second		Third		Fourth
Revenues	$	129,900	$	129,174	$	129,708	$	137,185

Gain/(loss) on sale of real estate assets	$	45,209	$	(23)	$	—	$	30,505
Net income	$	57,828	$	10,940	$	16,114	$	45,409

Net income applicable to Piedmont	$	57,830	$	10,942	$	16,114	$	45,410
Basic earnings per share	$	0.43	$	0.09	$	0.13	$	0.35
Diluted earnings per share	$	0.42	$	0.09	$	0.13	$	0.35
Dividends declared per share	$	0.21	$	0.21	$	0.21	$	0.21

Guarantor and Non-Guarantor Financial Information

12 Months Ended

Dec. 31, 2019

Guarantor and Non-Guarantor Financial Information [Abstract]

Guarantor and Non-Guarantor Financial Information

The following condensed consolidating financial information for Piedmont (the "Parent", "Guarantor", and/or "Consolidated"), Piedmont OP (the "Issuer"), and the other directly and indirectly owned subsidiaries of Piedmont as the Guarantor (the "Non-Guarantors") is provided pursuant to the requirements of Rule 3-10 of Regulation S-X regarding financial statements of guarantors and issuers of guaranteed registered securities. The Issuer is a wholly-owned subsidiary of the Guarantor, and all guarantees by the Guarantor of securities issued by the Issuer are full and unconditional. The principal elimination entries relate to investments in subsidiaries and intercompany balances and transactions, including transactions with the Non-Guarantor Subsidiaries.


Condensed Consolidated Balance Sheets
As of December 31, 2019
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Assets:
Real estate assets, at cost:
Land	$	—	$	36,094	$	470,295	$	—	$	506,389
Buildings and improvements, less accumulated depreciation	—		177,798		2,147,724		(300)		2,325,222
Intangible lease assets, less accumulated amortization	—		—		80,979		—		80,979
Construction in progress	—		2,412		27,508		—		29,920

Total real estate assets	—		216,304		2,726,506		(300)		2,942,510

Cash and cash equivalents	150		9,674		3,721		—		13,545
Tenant and straight-line receivables, net	—		16,450		142,894		—		159,344
Investment in subsidiaries	1,845,797		2,810,875		161		(4,656,833)		—
Notes receivable	—		810		144,500		(145,310)		—
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	—		6,180		21,112		(24)		27,268
Goodwill	—		98,918		—		—		98,918


Deferred lease costs, net	—		16,249		258,923		—		275,172

Total assets	$	1,845,947	$	3,175,460	$	3,297,817	$	(4,802,467)	$	3,516,757
Liabilities:
Debt, net	$	—	$	1,292,334	$	334,380	$	(145,310)	$	1,481,404
Accounts payable, accrued expenses, dividends payable, interest rate swaps and accrued capital expenditures	26,973		21,069		101,026		(24)		149,044
Deferred income	—		3,505		31,104		—		34,609
Intangible lease liabilities, net	—		—		32,726		—		32,726


Total liabilities	26,973		1,316,908		499,236		(145,334)		1,697,783
Equity:
Total stockholders’ equity	1,818,974		1,858,552		2,798,581		(4,657,133)		1,818,974
Total liabilities and stockholders’ equity	$	1,845,947	$	3,175,460	$	3,297,817	$	(4,802,467)	$	3,516,757


Condensed Consolidated Balance Sheets
As of December 31, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Assets:
Real estate assets, at cost:
Land	$	—	$	36,094	$	434,338	$	—	$	470,432
Buildings and improvements, less accumulated depreciation	—		176,927		1,944,943		(300)		2,121,570
Intangible lease assets, less accumulated amortization	—		—		77,676		—		77,676
Construction in progress	—		5,708		10,140		—		15,848
Real estate assets held for sale, net	—		—		331,068		—		331,068
Total real estate assets	—		218,729		2,798,165		(300)		3,016,594
Cash and cash equivalents	150		—		4,939		(518)		4,571
Tenant and straight-line rent receivables	—		16,143		131,419		—		147,562

Investment in subsidiaries	1,744,122		2,704,337		166		(4,448,625)		—
Notes receivable	—		810		144,500		(145,310)		—
Prepaid expenses, restricted cash, escrows, interest swaps, and other assets	42		5,682		21,653		(24)		27,353
Goodwill	—		98,918		—		—		98,918


Deferred lease costs, net	—		15,158		221,040		—		236,198
Other assets held for sale, net	—		—		61,233		—		61,233
Total assets	$	1,744,314	$	3,059,777	$	3,383,115	$	(4,594,777)	$	3,592,429
Liabilities:
Debt, net	$	—	$	1,495,065	$	335,717	$	(145,310)	$	1,685,472
Accounts payable, accrued expenses, dividends payable, interest rate swaps, and accrued capital expenditures	32,174		15,382		74,536		(542)		121,550

Deferred income	—		2,274		26,505		—		28,779
Intangible lease liabilities, net	—		—		35,708		—		35,708

Other liabilities held for sale	—		—		8,780		—		8,780
Total liabilities	32,174		1,512,721		481,246		(145,852)		1,880,289
Equity:






Total stockholders’ equity	1,712,140		1,547,056		2,901,869		(4,448,925)		1,712,140
Total liabilities and stockholders’ equity	$	1,744,314	$	3,059,777	$	3,383,115	$	(4,594,777)	$	3,592,429


Condensed Consolidated Statements of Income
For the year ended December 31, 2019
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Revenues:


Rental and tenant reimbursement revenue	$	—	$	46,669	$	468,070	$	(2,834)	$	511,905
Property management fee revenue	—		—		19,362		(15,964)		3,398
Other property related income	—		158		17,717		—		17,875
	—		46,827		505,149		(18,798)		533,178
Expenses:
Property operating costs	—		21,314		208,864		(18,798)		211,380
Depreciation	—		12,171		93,844		—		106,015
Amortization	—		1,940		74,726		—		76,666
Impairment loss on real estate assets	—		7,000		1,953		—		8,953
General and administrative	218		6,716		30,961		—		37,895
	218		49,141		410,348		(18,798)		440,909

Other income (expense):
Interest expense	—		(54,721)		(14,408)		7,535		(61,594)
Other income/(expense)	—		188		8,918		(7,535)		1,571




Gain on sale of real estate assets	—		113		196,897		—		197,010
	—		(54,420)		191,407		—		136,987
Income/(loss) before consolidated subsidiaries	(218)		(56,734)		286,208		—		229,256
Income from subsidiaries	229,479		255,325		—		(484,804)		—
Net income	229,261		198,591		286,208		(484,804)		229,256
Net loss applicable to noncontrolling interest	—		—		5		—		5
Net income applicable to Piedmont	$	229,261	$	198,591	$	286,213	$	(484,804)	$	229,261


Condensed Consolidated Statements of Income
For the year ended December 31, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Revenues:


Rental and tenant reimbursement revenue	$	—	$	44,710	$	462,173	$	(2,473)	$	504,410
Property management fee revenue	—		—		17,118		(15,668)		1,450
Other property related income	—		130		19,977		—		20,107
	—		44,840		499,268		(18,141)		525,967
Expenses:
Property operating costs	—		19,583		207,896		(18,141)		209,338
Depreciation	—		11,514		96,442		—		107,956
Amortization	—		1,990		61,305		—		63,295

General and administrative	289		6,576		22,848		—		29,713
	289		39,663		388,491		(18,141)		410,302

Other income (expense):
Interest expense	—		(54,095)		(14,558)		7,630		(61,023)
Other income/(expense)	—		144		9,124		(7,630)		1,638



Loss on extinguishment of debt	—		(1,680)		—		—		(1,680)
Gain on sale of real estate assets	—		1,417		74,274		—		75,691
	—		(54,214)		68,840		—		14,626
Income/(loss) before consolidated subsidiaries	(289)		(49,037)		179,617		—		130,291
Income from subsidiaries	130,585		178,648		—		(309,233)		—
Net income	130,296		129,611		179,617		(309,233)		130,291
Net loss applicable to noncontrolling interest	—		—		5		—		5
Net income applicable to Piedmont	$	130,296	$	129,611	$	179,622	$	(309,233)	$	130,296


Condensed Consolidated Statements of Income
For the year ended December 31, 2017
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Revenues:


Rental and tenant reimbursement revenue	$	—	$	54,109	$	501,420	$	(2,265)	$	553,264
Property management fee revenue	—		—		18,205		(16,470)		1,735
Other property related income	—		144		19,030		—		19,174
	—		54,253		538,655		(18,735)		574,173
Expenses:
Property operating costs	—		22,805		218,371		(18,735)		222,441
Depreciation	—		12,995		106,293		—		119,288
Amortization	—		3,049		72,318		—		75,367
Impairment loss	—		87		46,374		—		46,461
General and administrative	347		6,443		22,529		—		29,319
	347		45,379		465,885		(18,735)		492,876

Other income (expense):
Interest expense	—		(56,769)		(26,715)		15,360		(68,124)
Other income/(expense)	—		9,168		6,849		(15,360)		657

Equity in income of unconsolidated joint ventures	—		3,845		—		—		3,845


Gain on sale of real estate assets	—		6,431		109,443		—		115,874
	—		(37,325)		89,577		—		52,252
Net income/(loss)	(347)		(28,451)		162,347		—		133,549
Net loss applicable to noncontrolling interest	—		—		15		—		15
Net income/(loss) applicable to Piedmont	$	(347)	$	(28,451)	$	162,362	$	—	$	133,564


Consolidating Statements of Comprehensive Income
For the Year Ended December 31, 2019
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Net income	$	229,261	$	198,591	$	286,213	$	(484,804)	$	229,261
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges	(5,659)		(5,659)		—		5,659		(5,659)
Plus: Reclassification of net (gain)/loss included in net income	(1,836)		(1,836)		—		1,836		(1,836)
Other comprehensive income	(7,495)		(7,495)		—		7,495		(7,495)

Comprehensive income	$	221,766	$	191,096	$	286,213	$	(477,309)	$	221,766


Consolidating Statements of Comprehensive Income
For the Year Ended December 31, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Net income	$	130,296	$	129,611	$	179,622	$	(309,233)	$	130,296
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges	692		692		—		(692)		692
Plus: Reclassification of net (gain)/loss included in net income	(300)		(300)		—		300		(300)
Other comprehensive income	392		392		—		(392)		392

Comprehensive income	$	130,688	$	130,003	$	179,622	$	(309,625)	$	130,688


Condensed Consolidated Statements of Cash Flows
For the year ended December 31, 2019
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Net Cash Provided By Operating Activities	$	236,214	$	220,068	$	236,477	$	(484,275)	$	208,484

Cash Flows from Investing Activities:
Investment in real estate assets and intangibles	—		(16,020)		(413,733)		—		(429,753)



Net sales proceeds from wholly-owned properties	—		113		589,654		—		589,767




Deferred lease costs paid	—		(3,220)		(22,419)		—		(25,639)
Distributions from subsidiaries	(108,918)		19,287		—		89,631		—
Net cash provided by/(used in) investing activities	(108,918)		160		153,502		89,631		134,375
Cash Flows from Financing Activities:
Debt issuance costs paid	—		(151)		—		—		(151)
Proceeds from debt	—		592,000		—		—		592,000
Repayments of debt	—		(797,000)		(1,019)		—		(798,019)


Costs of issuance of common stock	(710)		—		—		—		(710)
Value of shares withheld to pay tax obligations related to employee stock compensation	(3,295)		—		—		—		(3,295)
Repurchases of common stock as part of announced plan	(16,899)		—		—		—		(16,899)

Distributions	(106,392)		(5,420)		(389,783)		395,162		(106,433)
Net cash used in financing activities	(127,296)		(210,571)		(390,802)		395,162		(333,507)
Net increase/(decrease) in cash, cash equivalents, and restricted cash and escrows	—		9,657		(823)		518		9,352
Cash, cash equivalents, and restricted cash and escrows, beginning of year	150		34		6,368		(518)		6,034
Cash, cash equivalents, and restricted cash and escrows, end of year	$	150	$	9,691	$	5,545	$	—	$	15,386


Condensed Consolidated Statements of Cash Flows
For the year ended December 31, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Net Cash Provided By Operating Activities	$	135,755	$	141,293	$	235,562	$	(309,741)	$	202,869

Cash Flows from Investing Activities:
Investment in real estate assets and intangibles	—		(14,479)		(209,540)		—		(224,019)
Intercompany note receivable	—		88,000		—		(88,000)		—


Net sales proceeds from wholly-owned properties	—		36,572		538,655		—		575,227
Note receivable issuance	—		—		(3,200)		—		(3,200)
Note receivable payment	—		—		3,200		—		3,200

Deferred lease costs paid	—		(3,090)		(24,340)		—		(27,430)
Distributions from subsidiaries	349,135		5,405		—		(354,540)		—
Net cash provided by investing activities	349,135		112,408		304,775		(442,540)		323,778
Cash Flows from Financing Activities:
Debt issuance costs paid	—		(1,040)		—		—		(1,040)
Proceeds from debt	—		977,062		—		—		977,062
Repayments of debt	—		(1,019,000)		(1,455)		—		(1,020,455)

Intercompany note payable	—		—		(88,000)		88,000		—
Costs of issuance of common stock	(85)		—		—		—		(85)
Value of shares withheld to pay tax obligations related to employee stock compensation	(2,219)		—		—		—		(2,219)
Repurchases of common stock as part of announced plan	(298,538)		—		—		—		(298,538)

Distributions	(184,048)		(214,596)		(449,212)		663,763		(184,093)

Net cash used in financing activities	(484,890)		(257,574)		(538,667)		751,763		(529,368)
Net increase/(decrease) in cash, cash equivalents, and restricted cash and escrows	—		(3,873)		1,670		(518)		(2,721)
Cash, cash equivalents, and restricted cash and escrows, beginning of year	150		3,907		4,698		—		8,755
Cash, cash equivalents, and restricted cash and escrows, end of year	$	150	$	34	$	6,368	$	(518)	$	6,034


Condensed Consolidated Statements of Cash Flows
For the year ended December 31, 2017
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Net Cash Provided/(Used In) by Operating Activities	$	5,497	$	(18,989)	$	256,297	$	—	$	242,805

Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net	—		(1,614)		(113,479)		—		(115,093)
Intercompany note receivable	—		100		(48,710)		48,610		—


Net sales proceeds from wholly-owned properties	—		23,028		352,490		—		375,518
Net sales proceeds received from unconsolidated joint ventures	—		12,334		—		—		12,334
Investments in unconsolidated joint ventures	—		(1,162)		—		—		(1,162)

Deferred lease costs paid	—		(4,081)		(26,904)		—		(30,985)
Net cash provided by investing activities	—		28,605		163,397		48,610		240,612
Cash Flows from Financing Activities:
Debt issuance costs paid	—		(132)		—		—		(132)
Proceeds from debt	—		180,000		—		—		180,000
Repayments of debt	—		(335,000)		(141,401)		—		(476,401)

Intercompany note payable	—		(14,289)		62,899		(48,610)		—
Costs of issuance of common stock	(182)		—		—		—		(182)
Value of shares withheld to pay tax obligations related to employee stock compensation	(3,403)		—		—		—		(3,403)
Repurchases of common stock as part of announced plan	(60,474)		—		—		—		(60,474)
(Distributions to)/repayments from affiliates	180,791		160,019		(340,810)		—		—
Dividends paid and discount on dividend reinvestments	(122,229)		—		(45)		—		(122,274)
Net cash used in financing activities	(5,497)		(9,402)		(419,357)		(48,610)		(482,866)
Net increase in cash, cash equivalents, and restricted cash and escrows	—		214		337		—		551
Cash, cash equivalents, and restricted cash and escrows, beginning of year	150		3,693		4,361		—		8,204
Cash, cash equivalents, and restricted cash and escrows, end of year	$	150	$	3,907	$	4,698	$	—	$	8,755

Subsequent events	12 Months Ended
Subsequent events	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent events	Subsequent events Declaration of Dividend for the First Quarter 2020 On February 4, 2020, the board of directors of Piedmont declared a dividend for the first quarter 2020 in the amount of $0.21 per share on its common stock to stockholders of record as of the close of business on February 28, 2020, payable on March 20, 2020. $150 Million Term Loan On February 10, 2020, Piedmont entered into an agreement with Truist Bank whereby Truist will extend Piedmont a $150 million term loan at LIBOR plus 95 basis points. The loan was unfunded at closing and can be funded in up to four draws at Piedmont’s discretion. The original term of the commitment period is six months, with the option to extend for two additional three month periods upon payment of applicable extension fees. Acquisition of The Galleria Office Towers On February 12, 2020, Piedmont purchased three Class A office towers in Dallas, Texas (the “Dallas Galleria Office Towers”) totaling approximately 1.4 million square feet of office space, associated parking garages, and a 1.9-acre land parcel located within a 3.7 million square foot mixed-use development that includes the Galleria Dallas retail destination, encompassing over 30 dining options and 1.5 million square feet of shopping, along with the 448-room Westin Galleria Hotel, for a net purchase price of $396 million, or approximately $275 per square foot. The acquisition was initially funded with cash on hand and borrowings under the Company's $500 Million Unsecured 2018 Line of Credit; however, Piedmont anticipates ultimately funding the majority of the acquisition using proceeds from the anticipated sale of 1901 Market in Philadelphia, Pennsylvania.

Schedule III - Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2019

SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]

Schedule III - Real Estate and Accumulated Depreciation

December 31, 2019

(dollars in thousands)


					Initial Cost to Piedmont						Gross Amount of Which Carried at December 31, 2019
Description⁽¹⁾	Location	Ownership Percentage		Encumbrances	Land	Buildings and Improvements	Total⁽²⁾	Costs Capitalized Subsequent to Acquisition⁽³⁾	Land	Buildings and Improvements	Total⁽⁴⁾	Accumulated Depreciation and Amortization	Date of Construction	Date Acquired	Life on which Depreciation and Amortization in Latest Statements of Comprehensive Income is Computed (in years)⁽⁵⁾
1430 ENCLAVE PARKWAY	Houston, TX	100	%	None	7,100	37,915	45,015	5,516	5,506	45,025	50,531	20,078	1994	12/21/2000	0	-	40
CRESCENT RIDGE II	Minnetonka, MN	100	%	None	7,700	45,154	52,854	12,099	8,021	56,932	64,953	27,328	2000	12/21/2000	0	-	40
90 CENTRAL STREET	Boxborough, MA	100	%	None	3,642	29,497	33,139	2,059	3,642	31,556	35,198	13,992	2001	5/3/2002	0	-	40
6031 CONNECTION DRIVE	Irving, TX	100	%	None	3,157	43,656	46,813	5,310	3,157	48,966	52,123	21,764	1999	8/15/2002	0	-	40
6021 CONNECTION DRIVE	Irving, TX	100	%	None	3,157	42,662	45,819	11,194	3,157	53,856	57,013	23,940	2000	8/15/2002	0	-	40
6011 CONNECTION DRIVE	Irving, TX	100	%	None	3,157	29,034	32,191	18,451	3,157	47,485	50,642	13,932	1999	8/15/2002	0	-	40
US BANCORP CENTER	Minneapolis, MN	100	%	None	11,138	175,629	186,767	31,031	11,138	206,660	217,798	84,479	2000	5/1/2003	0	-	40
GLENRIDGE HIGHLANDS TWO	Atlanta, GA	100	%	None	6,662	69,031	75,693	(16,167)	6,662	52,864	59,526	25,404	2000	8/1/2003	0	-	40
200 BRIDGEWATER CROSSING	Bridgewater, NJ	100	%	None	8,182	84,160	92,342	(11,288)	8,328	72,726	81,054	30,985	2002	8/14/2003	0	-	40
400 VIRGINIA AVE	Washington, DC	100	%	None	22,146	49,740	71,886	1,579	22,146	51,319	73,465	20,412	1985	11/19/2003	0	-	40
4250 NORTH FAIRFAX DRIVE	Arlington, VA	100	%	None	13,636	70,918	84,554	13,783	13,636	84,701	98,337	32,525	1998	11/19/2003	0	-	40
1225 EYE STREET	Washington, DC	98.1	%	None	21,959	47,602	69,561	9,139	21,959	56,741	78,700	23,701	1986	11/19/2003	0	-	40
1201 EYE STREET	Washington, DC	98.6	%	None	31,985	63,139	95,124	9,416	31,985	72,555	104,540	26,779	2001	11/19/2003	0	-	40
1901 MARKET STREET	Philadelphia, PA	100	%	160,000	13,584	166,683	180,267	53,684	20,829	213,122	233,951	94,261	1987	12/18/2003	0	-	40
60 BROAD STREET	New York, NY	100	%	None	32,522	168,986	201,508	12,105	60,708	152,905	213,613	58,955	1962	12/31/2003	0	-	40
1414 MASSACHUSETTS AVENUE	Cambridge, MA	100	%	None	4,210	35,821	40,031	(8,030)	4,365	27,636	32,001	11,120	1873	1/8/2004	0	-	40
ONE BRATTLE SQUARE	Cambridge, MA	100	%	None	6,974	64,940	71,914	(23,111)	7,113	41,690	48,803	16,976	1991	2/26/2004	0	-	40
600 CORPORATE DRIVE	Lebanon, NJ	100	%	None	3,934	—	3,934	9,281	3,934	9,281	13,215	8,775	2005	3/16/2004	0	-	40
3100 CLARENDON BOULEVARD	Arlington, VA	100	%	None	11,700	69,705	81,405	46,824	11,791	116,438	128,229	34,112	1987	12/9/2004	0	-	40


					Initial Cost						Gross Amount of Which Carried at December 31, 2019
Description⁽¹⁾	Location	Ownership Percentage		Encumbrances	Land	Buildings and Improvements	Total⁽²⁾	Costs Capitalized Subsequent to Acquisition⁽³⁾	Land	Buildings and Improvements	Total⁽⁴⁾	Accumulated Depreciation and Amortization	Date of Construction	Date Acquired	Life on which Depreciation and Amortization in Latest Statements of Comprehensive Income is Computed (in years)⁽⁵⁾
400 BRIDGEWATER CROSSING	Bridgewater, NJ	100	%	None	10,400	71,052	81,452	(14,328)	10,400	56,724	67,124	19,542	2002	2/17/2006	0	-	40
LAS COLINAS CORPORATE CENTER I	Irving, TX	100	%	None	3,912	18,830	22,742	(3,459)	2,543	16,740	19,283	6,961	1998	8/31/2006	0	-	40
LAS COLINAS CORPORATE CENTER II	Irving, TX	100	%	None	4,496	29,881	34,377	(3,484)	2,543	28,350	30,893	11,032	1998	8/31/2006	0	-	40
TWO PIERCE PLACE	Itasca, IL	100	%	None	4,370	70,632	75,002	13,155	8,156	80,001	88,157	23,285	1991	12/7/2006	0	-	40
ONE MERIDIAN CROSSINGS	Richfield, MN	100	%	None	2,919	24,398	27,317	460	2,919	24,858	27,777	6,456	1997	10/1/2010	0	-	40
TWO MERIDIAN CROSSINGS	Richfield, MN	100	%	None	2,661	25,742	28,403	766	2,661	26,508	29,169	6,964	1998	10/1/2010	0	-	40
THE MEDICI	Atlanta, GA	100	%	None	1,780	11,510	13,290	5,473	1,780	16,983	18,763	5,561	2008	6/7/2011	0	-	40
225 PRESIDENTIAL WAY	Boston, MA	100	%	None	3,626	36,916	40,542	(5,419)	3,612	31,511	35,123	6,479	2001	9/13/2011	0	-	40
235 PRESIDENTIAL WAY	Boston, MA	100	%	None	4,154	44,048	48,202	(6,851)	4,138	37,213	41,351	7,691	2000	9/13/2011	0	-	40
400 TOWNPARK	Lake Mary, FL	100	%	None	2,570	20,555	23,125	5,487	2,570	26,042	28,612	6,900	2008	11/10/2011	0	-	40
ARLINGTON GATEWAY	Arlington, VA	100	%	None	36,930	129,070	166,000	(525)	36,930	128,545	165,475	23,215	2005	3/4/2013	0	-	40
5 & 15 WAYSIDE ROAD	Burlington, MA	100	%	None	7,190	55,445	62,635	7,432	7,190	62,877	70,067	12,914	1999 / 2001	3/22/2013	0	-	40
6565 MACARTHUR BOULEVARD	Irving, TX	100	%	None	4,820	37,767	42,587	209	4,820	37,976	42,796	7,052	1998	12/5/2013	0	-	40
ONE LINCOLN PARK	Dallas, TX	100	%	None	6,640	44,810	51,450	1,250	6,640	46,060	52,700	9,352	1999	12/20/2013	0	-	40
161 CORPORATE CENTER	Irving, TX	100	%	None	2,020	10,680	12,700	(239)	2,020	10,441	12,461	2,894	1998	12/30/2013	0	-	40
5 WALL STREET	Burlington, MA	100	%	28,687	9,560	50,276	59,836	(3,722)	9,560	46,554	56,114	7,357	2008	6/27/2014	0	-	40
1155 PERIMETER CENTER WEST	Atlanta, GA	100	%	None	5,870	66,849	72,719	(2,452)	5,870	64,397	70,267	10,589	2000	8/28/2014	0	-	40
500 TOWNPARK	Lake Mary, FL	100	%	None	2,147	21,925	24,072	4,092	2,147	26,017	28,164	2,582	2016	N/A	0	-	40
PARK PLACE ON TURTLE CREEK	Dallas, TX	100	%	None	4,470	38,048	42,518	3,959	4,470	42,007	46,477	7,615	1986	1/16/2015	0	-	40


					Initial Cost												Gross Amount of Which Carried at December 31, 2019
Description⁽¹⁾	Location	Ownership Percentage		Encumbrances	Land		Buildings and Improvements		Total⁽²⁾		Costs Capitalized Subsequent to Acquisition⁽³⁾		Land		Buildings and Improvements		Total⁽⁴⁾		Accumulated Depreciation and Amortization		Date of Construction	Date Acquired	Life on which Depreciation and Amortization in Latest Statements of Comprehensive Income is Computed (in years)⁽⁵⁾
80 CENTRAL STREET	Boxborough, MA	100	%	None	1,980		8,930		10,910		3,021		1,980		11,951		13,931		1,250		1988	7/24/2015	0	-	40
ENCLAVE PLACE	Houston, TX	100	%	None	1,890		60,094		61,984		35,631		1,890		95,725		97,615		7,078		2015	N/A	0	-	40
SUNTRUST CENTER	Orlando, FL	100	%	None	11,660		139,015		150,675		6,612		11,660		145,627		157,287		18,244		1988	11/4/2015	0	-	40
GALLERIA 300	Atlanta, GA	100	%	None	4,000		73,554		77,554		5,145		4,000		78,699		82,699		12,434		1987	11/4/2015	0	-	40
GLENRIDGE HIGHLANDS ONE	Atlanta, GA	100	%	None	5,960		50,013		55,973		1,515		5,960		51,528		57,488		7,794		1998	11/24/2015	0	-	40
CNL CENTER I	Orlando, FL	99	%	None	6,470		77,858		84,328		(2,089)		6,470		75,769		82,239		9,175		1999	8/1/2016	0	-	40
CNL CENTER II	Orlando, FL	99	%	None	4,550		55,609		60,159		771		4,550		56,380		60,930		7,582		2006	8/1/2016	0	-	40
ONE WAYSIDE ROAD	Boston, MA	100	%	None	6,240		57,124		63,364		(4,471)		6,240		52,653		58,893		4,872		1997 / 2008	8/10/2016	0	-	40
GALLERIA 200	Atlanta, GA	100	%	None	6,470		55,825		62,295		3,757		6,470		59,582		66,052		6,596		1984	10/7/2016	0	-	40
750 WEST JOHN CARPENTER FREEWAY	Irving, TX	100	%	None	7,860		36,303		44,163		2,034		7,860		38,337		46,197		6,284		1999	11/30/2016	0	-	40
NORMAN POINTE I	Bloomington, MN	100	%	None	4,358		22,322		26,680		1,191		4,360		23,511		27,871		2,064		2000	12/28/2017	0	-	40
501 WEST CHURCH STREET	Orlando, FL	100	%	None	2,805		28,119		30,924		—		2,805		28,119		30,924		2,215		2003	2/23/2018	0	-	40
9320 EXCELSIOR BOULEVARD	Hopkins, MN	100	%	None	3,760		35,289		39,049		(553)		3,707		34,789		38,496		2,469		2010	10/25/2018	0	-	40
25 BURLINGTON MALL ROAD	Burlington, MA	100	%	None	10,230		54,787		65,017		(1,002)		10,230		53,785		64,015		5,203		1987	12/12/2018	0	-	40
GALLERIA 100	Atlanta, GA	100	%	None	7,285		72,449		79,734		946		7,285		73,395		80,680		3,863		1982	5/6/2019	0	-	40
GALLERIA 400	Atlanta, GA	100	%	None	5,687		92,915		98,602		203		5,687		93,118		98,805		1,614		1999	8/23/2019	0	-	40
GALLERIA 600	Atlanta, GA	100	%	None	5,418		81,003		86,421		558		5,418		81,561		86,979		1,915		2002	8/23/2019	0	-	40
PIEDMONT POWER, LLC ⁽⁶⁾	Bridgewater, NJ	100	%	None	—		79		79		2,740		—		2,819		2,819		960		N/A	12/20/2011	0	-	40
UNDEVELOPED LAND PARCELS ⁽⁷⁾	Various	100	%	None	40,503		—		40,503		(601)		37,614		2,288		39,902		206		N/A	Various			N/A
Total—All Properties					$	474,206	$	3,103,994	$	3,578,200	$	240,087	$	506,389	$	3,311,898	$	3,818,287	$	875,777

⁽¹⁾All of Piedmont's properties are office buildings, except for the separately described Undeveloped Land Parcels and solar equipment labeled Piedmont Power, LLC.

⁽²⁾Total initial cost excludes purchase price allocated to intangible lease origination costs and intangible lease liabilities.

⁽³⁾Includes improvements and carrying costs capitalized subsequent to acquisition, as well as reductions related to write-offs of fully depreciated/amortized capitalized assets and impairment losses on real estate assets.

⁽⁴⁾The net carrying value of Piedmont’s total assets for federal income tax purposes is approximately $3.3 billion.

⁽⁵⁾Piedmont’s assets are depreciated or amortized using the straight-line method over the useful lives of the assets by class. Generally, Tenant Improvements and Lease Intangibles are amortized over the lease term. Generally, Building Improvements are depreciated over 5 - 25 years, Land Improvements are depreciated over 20 - 25 years, and Buildings are depreciated over 40 years.

⁽⁶⁾Represents solar panels at the 400 Bridgewater Crossing building.

⁽⁷⁾Undeveloped Land Parcels includes land parcels that Piedmont may develop in the future.

Piedmont Office Realty Trust, Inc.

Schedule III - Real Estate and Accumulated Depreciation

December 31, 2019

(dollars in thousands)


	2019			2018		2017
Real Estate:
Balance at the beginning of the year	$	3,924,531		$	4,438,209	$	4,800,025
Additions to/improvements of real estate	406,833			206,442		85,368
Assets disposed	(452,672)			(675,692)		(353,911)		⁽¹⁾
Assets impaired	(8,953)		⁽³⁾	—		(46,461)		⁽²⁾
Write-offs of intangible assets ⁽⁴⁾	(36,429)			(33,067)		(37,188)
Write-offs of fully depreciated/amortized assets	(15,023)			(11,361)		(9,624)
Balance at the end of the year	$	3,818,287		$	3,924,531	$	4,438,209
Accumulated Depreciation and Amortization:
Balance at the beginning of the year	$	907,937		$	1,053,467	$	1,058,704
Depreciation and amortization expense	132,600			128,456		145,837
Assets disposed	(113,309)			(229,558)		(104,262)		⁽¹⁾
Write-offs of intangible assets ⁽⁴⁾	(36,428)			(33,067)		(37,188)
Write-offs of fully depreciated/amortized assets	(15,023)			(11,361)		(9,624)
Balance at the end of the year	$	875,777		$	907,937	$	1,053,467

⁽¹⁾Includes the disposition of the 8560 Upland Drive property, Piedmont's last remaining investment in an unconsolidated joint venture.

⁽²⁾Piedmont recognized an impairment loss on a disposal group of real estate assets as part of the 2017 Disposition Portfolio (see Note 7).

⁽³⁾Piedmont recognized an impairment loss on the Dupree building, as well as the 600 Corporate Drive building (see Note 7).

⁽⁴⁾Consists of write-offs of intangible lease assets related to lease restructurings, amendments, and terminations.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation and Principles of Consolidation

Principles of Consolidation

All inter-company balances and transactions have been eliminated upon consolidation.

Use of Estimates

Real Estate Assets

Piedmont’s real estate assets are depreciated or amortized using the straight-line method over the following useful lives:


Buildings			40 years
Building improvements			5-25 years
Land improvements			20-25 years
Tenant allowances			Lease term
Furniture, fixtures, and equipment			3-10 years
Intangible lease assets			Lease term

Fair Value of Assets and Liabilities of Acquired Properties

Investments in and Amounts Due from Unconsolidated Joint Ventures

Cash and Cash Equivalents

Tenant Receivables and Straight-line Rent Receivables

Tenant Receivables and Straight-line Rent ReceivablesTenant receivables are comprised of rental and reimbursement billings due from tenants, and straight-line rent receivables representing the cumulative amount of future adjustments necessary to present rental income on a straight-line basis. Effective January 1, 2019, Piedmont adopted ASC 842 Leases ("ASC 842") (see Accounting Pronouncements Adopted During the Year Ended December 31, 2019 below for more detail) as well as Accounting Standards Update ("ASU"), ASU No. 2018-19 ("ASU 2018-19") which clarifies that operating lease receivables are within the scope of ASC 842; therefore, Piedmont has elected to evaluate the collectibility of its operating lease receivables on a tenant/lease-specific basis and, as of January 1, 2019, began recognizing changes in the collectibility assessment of its operating lease receivables as a reduction of rental and tenant reimbursement revenue, rather than as bad debt expense, a component of property operating costs. Prior to the adoption of ASC 842, during the years ended December 31, 2018 and 2017, Piedmont recognized approximately $91,000 and $350,000, respectively, of expense related to uncollectible operating lease receivables as additional property operating costs

Restricted Cash and Escrows

Restricted cash and escrows principally relate to the following types of items:

•escrow accounts held by lenders to pay future real estate taxes, insurance, debt service, and tenant improvements;

•net sales proceeds from property sales held by qualified intermediary for potential Section 1031 exchange;

•earnest money paid in connection with future acquisitions; and

•security and utility deposits paid by tenants per the terms of their respective leases.

Restricted cash and escrows are generally reclassified to other asset or liability accounts upon being used to purchase assets, satisfy obligations, or settle tenant obligations.

Prepaid Expenses and Other Assets

Prepaid expenses and other assets are primarily comprised of the following items:

•prepaid property taxes, insurance and operating costs;

•receivables which are unrelated to tenants, for example, insurance proceeds receivable from insurers related to casualty losses; and

•equipment, furniture and fixtures, and tenant improvements for Piedmont’s corporate office and property management office space, net of accumulated depreciation.

Goodwill

GoodwillGoodwill is the excess of cost of an acquired entity over the amounts specifically assigned to assets acquired and liabilities assumed in purchase accounting for business combinations. Piedmont tests the carrying value of its goodwill for impairment on an annual basis, or on an interim basis if an event occurs or circumstances change that would indicate the carrying amount may be impaired. Such interim circumstances may include, but are not limited to, significant adverse changes in legal factors or in the general business climate, adverse action or assessment by a regulator, unanticipated competition, the loss of key personnel, or persistent declines in an entity’s stock price below carrying value of the entity. Piedmont first assesses qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the estimated fair value of the reporting unit is less than its carrying amount. Piedmont internally evaluates its consolidated financial position and all of its operations as one reporting unit. If Piedmont concludes, after assessing the totality of events and circumstances during the qualitative analysis, that it is more likely than not that the goodwill balance is impaired, then Piedmont will recognize a goodwill impairment loss by the excess of the reporting unit’s carrying amount over its estimated fair value (not to exceed the total goodwill allocated to that reporting unit).

Interest Rate Derivatives

Deferred Lease Costs

Deferred lease costs are amortized on a straight-line basis over the terms of the related underlying leases in the accompanying consolidated statements of income as follows:

•Approximately $50.3 million, $43.6 million, and $50.8 million of deferred lease costs for the years ended December 31, 2019, 2018, and 2017, respectively, are included in amortization expense; and

Debt

DebtWhen mortgage debt is assumed upon the acquisition of real property, Piedmont adjusts the loan to relative fair value with a corresponding adjustment to building and other intangible assets assumed as part of the purchase. The fair value adjustment is amortized to interest expense over the term of the loan using the effective interest method.Piedmont records premiums and discounts on debt issuances as an increase/decrease to the principal amount of the loan in the accompanying consolidated balance sheets, and amortizes such premiums or discounts as a component of interest expense over the life of the underlying loan facility using the effective interest method.Piedmont presents all debt issuance costs as an offset to the principal amount of debt in the accompanying consolidated balance sheets. Piedmont amortizes these costs to interest expense on a straight-line basis (which approximates the effective interest rate method) over the terms of the related financing arrangements.

Deferred Income and Revenue Recognition

Deferred income

Deferred income is primarily comprised of the following items:

•prepaid rent from tenants; and

•tenant reimbursements related to operating expense or property tax expenses which may be due to tenants as part of an annual operating expense reconciliation.

•tenant improvement allowance overages where Piedmont owns the underlying improvements

Revenue Recognition

Piedmont's revenues consist of the following:

•whether the tenant is obligated by the terms of the lease agreement to construct or install the leasehold improvements as a condition of the lease;

•whether the landlord can require the lessee to make specified improvements or otherwise enforce its economic rights to those assets;

•whether the tenant is required to provide the landlord with documentation supporting the cost of tenant improvements prior to reimbursement by the landlord;

•whether the landlord is obligated to fund cost overruns for the construction of leasehold improvements;

•whether the leasehold improvements are unique to the tenant or could reasonably be used by other parties; and

•whether the estimated economic life of the leasehold improvements is long enough to allow for a significant residual value that could benefit the landlord at the end of the lease term.

Shares-in-trust, Preferred Stock, Common Stock, Dividends

Shares-in-trust

Preferred Stock

Common Stock

Equity Securities Issued At-The-Market

Dividends

Noncontrolling Interest

Stock-based Compensation and Nonqualified Deferred Compensation Plan

Stock-based Compensation

Non-qualified Deferred Compensation Plan

Net Income Available to Common Stockholders Per Share

Income Taxes

Accounting Pronouncements Adopted and Other Recent Accounting Pronouncements

Accounting Pronouncements Adopted during the Year Ended December 31, 2019

Leases

In conjunction with the adoption of ASC 842, Piedmont adopted the following optional practical expedients, transition amendments, or made accounting policy elections as follows:

•an optional practical transition expedient provided by ASU No. 2018-01 which allowed Piedmont to exclude certain land easements in place as of January 1, 2019 from the new guidance;


Years ending December 31:
2019	$	370,495
2020	352,541
2021	337,951
2022	324,960
2023	291,603
Thereafter	1,247,649
Total	$	2,925,199

Stock Compensation to Non-employees

manner prescribed by the newly adopted standard. As such, there was no cumulative effect adjustment recognized upon adoption.

Reclassifications

Other Recent Accounting Pronouncements

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Property, Plant and Equipment

Piedmont’s real estate assets are depreciated or amortized using the straight-line method over the following useful lives:


Buildings			40 years
Building improvements			5-25 years
Land improvements			20-25 years
Tenant allowances			Lease term
Furniture, fixtures, and equipment			3-10 years
Intangible lease assets			Lease term

Schedule of Finite-Lived Intangible Assets by Major Class


	December 31, 2019		December 31, 2018
Intangible Lease Assets:
Above-Market In-Place Lease Assets	$	2,082	$	7,620
In-Place Lease Valuation	$	157,101	$	157,447
Intangible Lease Origination Costs (included as component of Deferred Lease Costs)	$	256,627	$	241,516
Intangible Lease Liabilities (Below-Market In-Place Leases)	$	84,292	$	94,852

Amortization Of Intangible Lease Costs

For the years ended December 31, 2019, 2018, and 2017, respectively, Piedmont recognized amortization of intangible lease costs as follows (in thousands):


	2019		2018		2017
Amortization of Intangible Lease Origination Costs and In-Place Lease Valuation included in amortization expense	$	62,413	$	48,940	$	58,467
Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues	$	8,322	$	7,615	$	6,575

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Net intangible assets and liabilities as of December 31, 2019 will be amortized as follows (in thousands):


	Intangible Lease Assets
	Above-Market In-place Lease Assets		In-Place Lease Valuation		Intangible Lease Origination Costs ⁽¹⁾		Below-Market In-place Lease Liabilities
For the year ending December 31:
2020	$	423	$	22,397	$	34,267	$	8,304
2021	367		18,650		30,112		7,901
2022	272		13,950		23,341		6,421
2023	97		9,383		16,055		4,616
2024	64		4,861		9,576		1,706
Thereafter	—		10,515		22,957		3,778
	$	1,223	$	79,756	$	136,308	$	32,726

Weighted-Average Amortization Period (in years)	3		5		6		5

⁽¹⁾Included as a component of Deferred Lease Costs in the accompanying consolidated balance sheets.

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2019

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition


Property	Metropolitan Statistical Area	Date of Acquisition	Ownership Percentage Acquired		Rentable Square Feet (Unaudited)	Percentage Leased as of Acquisition (Unaudited)			Net Contractual Purchase Price (in millions) ⁽¹⁾
Galleria 100	Atlanta, Georgia	May 6, 2019	100	%	414,293	91	%		$	95.1
Galleria 400 and 600	Atlanta, Georgia	August 23, 2019	100	%	863,623	84	%	⁽²⁾	$	231.2

⁽¹⁾Price for both acquisitions includes the purchase of adjacent parcels of developable land, totaling approximately 11.7 acres.

⁽²⁾Represents weighted-average leased percentage at acquisition of the Galleria 400 and 600 buildings.

Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Schedule of Debt


Facility ⁽¹⁾	Stated Rate		Effective Rate ⁽²⁾			Maturity		Amount Outstanding as of
												2019	2018
Secured (Fixed)







$35 Million Fixed-Rate Loan ⁽³⁾	5.55	%	3.75	%		9/1/2021		$	28,687	$	29,706
$160 Million Fixed-Rate Loan ⁽⁴⁾	3.48	%	3.58	%		7/5/2022		160,000		160,000
Net premium and unamortized debt issuance costs								343		645
Subtotal/Weighted Average ⁽⁵⁾	3.79	%						189,030		190,351
Unsecured (Variable and Fixed)





Amended and Restated $300 Million Unsecured 2011 Term Loan	LIBOR + 1.00%		3.20	%	⁽⁷⁾	11/30/2021		300,000		300,000.0
$500 Million Unsecured 2018 Line of Credit ⁽⁶⁾	LIBOR + 0.90%		2.70	%		9/30/2022	⁽⁸⁾	—		205,000
$350 Million Unsecured Senior Notes	3.40	%	3.43	%		6/01/2023		350,000		350,000
$400 Million Unsecured Senior Notes	4.45	%	4.10	%		3/15/2024		400,000		400,000
$250 Million Unsecured 2018 Term Loan	LIBOR + 1.60%		3.83	%	⁽⁹⁾	3/31/2025		250,000		250,000
Discounts and unamortized debt issuance costs								(7,626)		(9,879)
Subtotal/Weighted Average ⁽⁵⁾	3.76	%						1,292,374		1,495,121
Total/Weighted Average ⁽⁵⁾	3.76	%						$	1,481,404	$	1,685,472

⁽¹⁾Other than the $35 Million Fixed-Rate Loan, all of Piedmont’s outstanding debt as of December 31, 2019 and 2018 is interest-only until maturity.

⁽²⁾Effective rate after consideration of settled or in-place interest rate swap agreements, issuance premiums/discounts, and/or fair market value adjustments upon assumption of debt.

⁽³⁾Collateralized by the 5 Wall Street building in Burlington, Massachusetts.

⁽⁴⁾Collateralized by the 1901 Market Street building in Philadelphia, Pennsylvania.

⁽⁵⁾Weighted average is based on contractual balance of outstanding debt and the stated or effectively fixed interest rates as of December 31, 2019.

⁽⁶⁾On a periodic basis, Piedmont may select from multiple interest rate options, including the prime rate and various-length LIBOR

locks on all or a portion of the principal. All LIBOR selections are subject to an additional spread over the selected rate based on

Piedmont’s current credit rating.

Schedule of Maturities of Long-term Debt

A summary of Piedmont's consolidated principal outstanding for aggregate debt maturities of its indebtedness as of December 31, 2019, is provided below (in thousands):


2020	$	985
2021	327,702
2022	160,000
2023	350,000
2024	400,000
Thereafter	250,000
Total	$	1,488,687

Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions

A detail of Piedmont’s interest rate derivatives outstanding as of December 31, 2019 is as follows:

Interest Rate Derivatives:

Number of Swap Agreements

Associated Debt Instrument

Notional Amount
(in millions)

Effective Date

Maturity Date

Interest rate swaps

Amended and Restated $300 Million Unsecured 2011 Term Loan

300

11/22/2016

1/15/2020

Interest rate swaps

$250 Million Unsecured 2018 Term Loan

100

3/29/2018

3/31/2025

Interest rate swaps

$250 Million Unsecured 2018 Term Loan

3/29/2018

3/29/2020

Total

450

Schedule of Interest Rate Derivatives

A detail of Piedmont’s interest rate derivatives on a gross and net basis as of December 31, 2019 and 2018, respectively, is as follows (in thousands):


Interest rate swaps classified as:	December 31, 2019		December 31, 2018
Gross derivative assets	$	—	$	1,199
Gross derivative liabilities	(5,121)		(839)
Net derivative asset/(liability)	$	(5,121)	$	360

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)


Interest Rate Swaps in Cash Flow Hedging Relationships:	2019		2018		2017
Amount of gain/(loss) recognized in OCI	$	(5,659)	$	692	$	2,479
Amount of previously recorded gain/(loss) reclassified from OCI into Interest Expense	$	1,836	$	1,558	$	(3,502)
Amount of loss recognized on derivatives reclassified from OCI into Loss on Extinguishment of Debt	$	—	$	(1,258)	$	—

Total amount of Interest Expense presented in the consolidated statements of income	$	(61,594)	$	(61,023)	$	(68,124)
Total amount of Loss on Extinguishment of Debt presented in the consolidated statements of income ⁽¹⁾	$	—	$	(1,680)	$	—

Fair Value Measurements of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping

The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments, as well as its level within the GAAP fair value hierarchy, as of December 31, 2019 and 2018, respectively (in thousands):


	December 31, 2019									December 31, 2018
Financial Instrument	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy
Assets:
Cash and cash equivalents ⁽¹⁾	$	13,545	$	13,545	Level 1	$	4,571	$	4,571	Level 1
Tenant receivables, net ⁽¹⁾	$	8,226	$	8,226	Level 1	$	10,800	$	10,800	Level 1

Restricted cash and escrows ⁽¹⁾	$	1,841	$	1,841	Level 1	$	1,463	$	1,463	Level 1
Interest rate swaps	$	—	$	—	Level 2	$	1,199	$	1,199	Level 2
Liabilities:
Accounts payable and accrued expenses ⁽¹⁾	$	50,049	$	50,049	Level 1	$	47,328	$	47,328	Level 1
Interest rate swaps	$	5,121	$	5,121	Level 2	$	839	$	839	Level 2
Debt, net	$	1,481,404	$	1,536,687	Level 2	$	1,685,472	$	1,698,213	Level 2

⁽¹⁾For the periods presented, the carrying value of these financial instruments approximates estimated fair value due to its short-term maturity.

Impairment Loss on Real Estate Assets (Tables)

12 Months Ended

Dec. 31, 2019

Real Estate [Abstract]

Impairment Loss on Real Estate Assets

Piedmont recorded the following impairment losses on real estate assets for the years ended December 31, 2019, 2018, and 2017 (in thousands):


	2019		2018		2017





The Dupree⁽¹⁾	$	1,953	$	—	$	—
600 Corporate Drive⁽²⁾	7,000		—		—
Disposal Group of 13 Assets⁽¹⁾	—		—		46,461
Total impairment loss on real estate assets	$	8,953	$	—	$	46,461

Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Nonvested Share Activity

A rollforward of Piedmont's equity based award activity for the year ended December 31, 2019 is as follows:


	Shares		Weighted-Average Grant Date Fair Value
Unvested and Potential Stock Awards as of December 31, 2018	1,227,483		$	23.14
Deferred Stock Awards Granted	354,057		$	21.02
Increase in Estimated Potential Share Awards based on Performance	271,450		$	28.34
Performance Stock Awards Vested	(352,404)	⁽¹⁾	$	25.83
Deferred Stock Awards Vested	(440,450)	⁽¹⁾	$	19.66
Deferred Stock Awards Forfeited	(15,116)		$	19.19
Unvested and Potential Stock Awards as of December 31, 2019	1,045,020		$	25.15

⁽¹⁾Includes performance share and deferred stock awards that were settled in cash in July 2019 in conjunction with the senior

management transition that occurred on June 30, 2019.

The following table provides additional information regarding stock award activity during the years ended 2019, 2018, and 2017 (in thousands except for per share amounts):


	2019		2018		2017
Weighted-Average Grant Date Fair Value of Deferred Stock Granted During the Period	$	21.02	$	17.84	$	21.38
Total Grant Date Fair Value of Deferred Stock Vested During the Period	$	8,658	$	6,378	$	5,899
Share-based Liability Awards Paid During the Period ⁽¹⁾	$	6,683	$	2,947	$	2,877

Schedule of Outstanding Employee Deferred Stock Awards

A detail of Piedmont’s outstanding employee deferred stock awards as of December 31, 2019 is as follows:


Date of grant	Type of Award	Net Shares Granted ⁽¹⁾	Grant Date Fair Value		Vesting Schedule	Unvested and Potential Shares as of December 31, 2019













May 18, 2017	Deferred Stock Award	196,036	$	21.38	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 18, 2018, 2019, and 2020, respectively.	40,871
May 18, 2017	Fiscal Year 2017-2019 Performance Share Program	—	$	30.45	Shares awarded, if any, will vest immediately upon determination of award in 2020.	153,368	⁽²⁾

May 17, 2018	Deferred Stock Award	271,169	$	17.84	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 17, 2019, 2020, and 2021, respectively.	108,031
May 17, 2018	Fiscal Year 2018-2020 Performance Share Program	—	$	23.52	Shares awarded, if any, will vest immediately upon determination of award in 2021.	200,674	⁽²⁾
May 15, 2019	Deferred Stock Award-Board of Directors	25,974	$	20.79	Of the shares granted, 100% will vest by May 15, 2020.	25,974
May 3, 2019	Deferred Stock Award	300,825	$	21.04	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 3, 2020, 2021, and 2022, respectively.	194,816
May 3, 2019	Fiscal Year 2019-2021 Performance Share Program	—	$	29.43	Shares awarded, if any, will vest immediately upon determination of award in 2022.	321,286	⁽²⁾

Total						1,045,020

(2)Estimated based on Piedmont's cumulative TSR for the respective performance period through December 31, 2019. Share estimates are subject to change in future periods based upon Piedmont's relative performance compared to its peer group of office REITs' TSR.

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares


	2019	2018	2017
Weighted-average common shares—basic	125,709	130,161	145,044
Plus: Incremental weighted-average shares from time-vested deferred and performance stock awards	473	475	336
Weighted-average common shares—diluted	126,182	130,636	145,380

Operating Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Lessor, Operating Lease, Payments to be Received

The future minimum rental income from Piedmont’s investment in real estate assets under non-cancelable operating leases as of December 31, 2019 is presented below (in thousands):


Years ending December 31:
2020	$	384,891
2021	378,312
2022	362,977
2023	329,490
2024	287,755
Thereafter	1,520,051
Total	$	3,263,476

Operating Lease, Lease Income


	2019		2018		2017
Fixed payments	$	418,246	$	411,667	$	455,125
Variable payments	93,659		92,743		98,139
Total Rental and Tenant Reimbursement Revenue	$	511,905	$	504,410	$	553,264

Property Dispositions and Assets Held for Sale (Tables)

12 Months Ended

Dec. 31, 2019

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures

Details of such properties sold are presented below (in thousands):


Buildings Sold	Location	Date of Sale	Gain on Sale of Real Estate Assets			Net Sales Proceeds



















Sarasota Commerce Center II	Sarasota, Florida	June 16, 2017	$	6,493		$	23,090
Two Independence Square	Washington, D.C.	July 5, 2017	$	109,381	⁽¹⁾	$	352,428
8560 Upland Drive	Denver, Colorado	July 27, 2017	$	3,683		$	12,334	⁽²⁾
2017 Disposition Portfolio	Various⁽³⁾	January 4, 2018	$	45,275		$	419,644	⁽⁴⁾
800 North Brand Boulevard	Glendale, California	November 29, 2018	$	30,416		$	155,583
One Independence Square	Washington, D.C.	February 28, 2019	$	33,176		$	163,623
The Dupree	Atlanta, Georgia	September 4, 2019	$	—	⁽⁵⁾	$	12,631
500 West Monroe Street	Chicago, Illinois	October 28, 2019	$	157,739		$	408,851

⁽⁴⁾Piedmont accepted a secured $3.2 million promissory note from the buyer for a portion of the sales price, which was subsequently paid in full by the borrower.

⁽⁵⁾As discussed in Note 7 above, Piedmont recognized an impairment loss prior to the sale of the property.

Assets Held For Sale and Discontinude Operations

Details of amounts held for sale as of December 31, 2019 and 2018 are presented below (in thousands):


	December 31, 2019		December 31, 2018
Real estate assets held for sale, net:
Land	$	—	$	67,552
Building and improvements, less accumulated depreciation of $0 and $102,476 as of December 31, 2019, and 2018, respectively	—		261,463

Construction in progress	—		2,053
Total real estate assets held for sale, net	$	—	$	331,068

Other assets held for sale, net:
Straight-line rent receivables	$	—	$	36,584
Prepaid expenses and other assets	—		1,095
Deferred lease costs, less accumulated amortization of $0 and $9,138 as of December 31, 2019 and 2018, respectively	—		23,554

Total other assets held for sale, net	$	—	$	61,233

Other liabilities held for sale, net:
Accrued expenses	$	—	$	8,780

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

Supplemental Disclosures for the Statement of Consolidated Cash Flows (Tables)

12 Months Ended

Dec. 31, 2019

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

Certain noncash investing and financing activities for the years ended December 31, 2019, 2018, and 2017 (in thousands) are outlined below:


	2019		2018		2017
Accrued capital expenditures and deferred lease costs	$	38,366	$	10,854	$	11,276
Change in accrued dividends and discount on dividend reinvestments	$	(545)	$	(74,828)	$	71,267


Change in accrued share repurchases as part of an announced plan	$	(4,417)	$	3,140	$	1,276
Investment in consolidated joint venture	$	—	$	—	$	63,026


	2019		2018		2017
Cash and cash equivalents, beginning of period	$	4,571	$	7,382	$	6,992
Restricted cash and escrows, beginning of period	1,463		1,373		1,212


Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows, beginning of period	$	6,034	$	8,755	$	8,204

Cash and cash equivalents, end of period	$	13,545	$	4,571	$	7,382
Restricted cash and escrows, end of period	1,841		1,463		1,373


Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows, end of period	$	15,386	$	6,034	$	8,755

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Tax Basis Income

Piedmont’s income tax basis net income for the years ended December 31, 2019, 2018, and 2017, is calculated as follows (in thousands):


	2019		2018		2017
GAAP basis financial statement net income	$	229,261	$	130,296	$	133,564
Increase/(decrease) in net income resulting from:
Depreciation and amortization expense recognized for financial reporting purposes in excess of amounts recognized for income tax purposes	10,381		54,420		62,916
Rental income accrued for income tax purposes less than amounts for financial reporting purposes	(34,804)		(9,681)		(25,432)
Net amortization of above/below-market lease intangibles for income tax purposes in excess of amounts for financial reporting purposes	(7,698)		(7,453)		(6,041)
Gain on disposal of property for financial reporting purposes less than/(in excess of) amounts for income tax purposes	(85,463)		(36,241)		10,068
Taxable income or loss of Piedmont Washington Properties, Inc., in excess of/(less than) amount for financial reporting purposes	411		(2,089)		176
Other expenses, including impairment loss on real estate assets, for financial reporting purposes in excess of/ (less than) amounts for income tax purposes	23,127		(37,394)		49,859
Taxable income for POH in excess of/(less than) amount for financial reporting purposes	175		(64)		(28)
Income tax basis net income, prior to dividends paid deduction	$	135,390	$	91,794	$	225,082

Schedule of Characterization Of Dividends To Common Stockholders


	2019		2018		2017
Ordinary income	29.82	%	100.00	%	53.61	%
Return of capital	—	%	—	%	—	%
Capital gains	70.18	%	—	%	46.39	%
	100	%	100	%	100	%

Quarterly Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

A summary of the unaudited quarterly financial information for the years ended December 31, 2019 and 2018, is presented below (in thousands, except per-share data):


	2019
	First		Second		Third		Fourth
Revenues	$	132,936	$	130,668	$	135,421	$	134,153

Gain on sale of real estate assets	$	37,887	$	1,451	$	32	$	157,640
Net income	$	50,209	$	8,152	$	8,419	$	162,476

Net income applicable to Piedmont	$	50,208	$	8,153	$	8,422	$	162,478

Basic and diluted earnings per share	$	0.40	$	0.06	$	0.07	$	1.29
Dividends declared per share	$	0.21	$	0.21	$	0.21	$	0.21


	2018
	First		Second		Third		Fourth
Revenues	$	129,900	$	129,174	$	129,708	$	137,185

Gain/(loss) on sale of real estate assets	$	45,209	$	(23)	$	—	$	30,505
Net income	$	57,828	$	10,940	$	16,114	$	45,409

Net income applicable to Piedmont	$	57,830	$	10,942	$	16,114	$	45,410
Basic earnings per share	$	0.43	$	0.09	$	0.13	$	0.35
Diluted earnings per share	$	0.42	$	0.09	$	0.13	$	0.35
Dividends declared per share	$	0.21	$	0.21	$	0.21	$	0.21

Guarantor and Non-Guarantor Financial Information (Tables)

12 Months Ended

Dec. 31, 2019

Guarantor and Non-Guarantor Financial Information [Abstract]

Condensed Balance Sheet


Condensed Consolidated Balance Sheets
As of December 31, 2019
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Assets:
Real estate assets, at cost:
Land	$	—	$	36,094	$	470,295	$	—	$	506,389
Buildings and improvements, less accumulated depreciation	—		177,798		2,147,724		(300)		2,325,222
Intangible lease assets, less accumulated amortization	—		—		80,979		—		80,979
Construction in progress	—		2,412		27,508		—		29,920

Total real estate assets	—		216,304		2,726,506		(300)		2,942,510

Cash and cash equivalents	150		9,674		3,721		—		13,545
Tenant and straight-line receivables, net	—		16,450		142,894		—		159,344
Investment in subsidiaries	1,845,797		2,810,875		161		(4,656,833)		—
Notes receivable	—		810		144,500		(145,310)		—
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	—		6,180		21,112		(24)		27,268
Goodwill	—		98,918		—		—		98,918


Deferred lease costs, net	—		16,249		258,923		—		275,172

Total assets	$	1,845,947	$	3,175,460	$	3,297,817	$	(4,802,467)	$	3,516,757
Liabilities:
Debt, net	$	—	$	1,292,334	$	334,380	$	(145,310)	$	1,481,404
Accounts payable, accrued expenses, dividends payable, interest rate swaps and accrued capital expenditures	26,973		21,069		101,026		(24)		149,044
Deferred income	—		3,505		31,104		—		34,609
Intangible lease liabilities, net	—		—		32,726		—		32,726


Total liabilities	26,973		1,316,908		499,236		(145,334)		1,697,783
Equity:
Total stockholders’ equity	1,818,974		1,858,552		2,798,581		(4,657,133)		1,818,974
Total liabilities and stockholders’ equity	$	1,845,947	$	3,175,460	$	3,297,817	$	(4,802,467)	$	3,516,757


Condensed Consolidated Balance Sheets
As of December 31, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Assets:
Real estate assets, at cost:
Land	$	—	$	36,094	$	434,338	$	—	$	470,432
Buildings and improvements, less accumulated depreciation	—		176,927		1,944,943		(300)		2,121,570
Intangible lease assets, less accumulated amortization	—		—		77,676		—		77,676
Construction in progress	—		5,708		10,140		—		15,848
Real estate assets held for sale, net	—		—		331,068		—		331,068
Total real estate assets	—		218,729		2,798,165		(300)		3,016,594
Cash and cash equivalents	150		—		4,939		(518)		4,571
Tenant and straight-line rent receivables	—		16,143		131,419		—		147,562

Investment in subsidiaries	1,744,122		2,704,337		166		(4,448,625)		—
Notes receivable	—		810		144,500		(145,310)		—
Prepaid expenses, restricted cash, escrows, interest swaps, and other assets	42		5,682		21,653		(24)		27,353
Goodwill	—		98,918		—		—		98,918


Deferred lease costs, net	—		15,158		221,040		—		236,198
Other assets held for sale, net	—		—		61,233		—		61,233
Total assets	$	1,744,314	$	3,059,777	$	3,383,115	$	(4,594,777)	$	3,592,429
Liabilities:
Debt, net	$	—	$	1,495,065	$	335,717	$	(145,310)	$	1,685,472
Accounts payable, accrued expenses, dividends payable, interest rate swaps, and accrued capital expenditures	32,174		15,382		74,536		(542)		121,550

Deferred income	—		2,274		26,505		—		28,779
Intangible lease liabilities, net	—		—		35,708		—		35,708

Other liabilities held for sale	—		—		8,780		—		8,780
Total liabilities	32,174		1,512,721		481,246		(145,852)		1,880,289
Equity:






Total stockholders’ equity	1,712,140		1,547,056		2,901,869		(4,448,925)		1,712,140
Total liabilities and stockholders’ equity	$	1,744,314	$	3,059,777	$	3,383,115	$	(4,594,777)	$	3,592,429

Condensed Income Statement


Condensed Consolidated Statements of Income
For the year ended December 31, 2019
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Revenues:


Rental and tenant reimbursement revenue	$	—	$	46,669	$	468,070	$	(2,834)	$	511,905
Property management fee revenue	—		—		19,362		(15,964)		3,398
Other property related income	—		158		17,717		—		17,875
	—		46,827		505,149		(18,798)		533,178
Expenses:
Property operating costs	—		21,314		208,864		(18,798)		211,380
Depreciation	—		12,171		93,844		—		106,015
Amortization	—		1,940		74,726		—		76,666
Impairment loss on real estate assets	—		7,000		1,953		—		8,953
General and administrative	218		6,716		30,961		—		37,895
	218		49,141		410,348		(18,798)		440,909

Other income (expense):
Interest expense	—		(54,721)		(14,408)		7,535		(61,594)
Other income/(expense)	—		188		8,918		(7,535)		1,571




Gain on sale of real estate assets	—		113		196,897		—		197,010
	—		(54,420)		191,407		—		136,987
Income/(loss) before consolidated subsidiaries	(218)		(56,734)		286,208		—		229,256
Income from subsidiaries	229,479		255,325		—		(484,804)		—
Net income	229,261		198,591		286,208		(484,804)		229,256
Net loss applicable to noncontrolling interest	—		—		5		—		5
Net income applicable to Piedmont	$	229,261	$	198,591	$	286,213	$	(484,804)	$	229,261


Condensed Consolidated Statements of Income
For the year ended December 31, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Revenues:


Rental and tenant reimbursement revenue	$	—	$	44,710	$	462,173	$	(2,473)	$	504,410
Property management fee revenue	—		—		17,118		(15,668)		1,450
Other property related income	—		130		19,977		—		20,107
	—		44,840		499,268		(18,141)		525,967
Expenses:
Property operating costs	—		19,583		207,896		(18,141)		209,338
Depreciation	—		11,514		96,442		—		107,956
Amortization	—		1,990		61,305		—		63,295

General and administrative	289		6,576		22,848		—		29,713
	289		39,663		388,491		(18,141)		410,302

Other income (expense):
Interest expense	—		(54,095)		(14,558)		7,630		(61,023)
Other income/(expense)	—		144		9,124		(7,630)		1,638



Loss on extinguishment of debt	—		(1,680)		—		—		(1,680)
Gain on sale of real estate assets	—		1,417		74,274		—		75,691
	—		(54,214)		68,840		—		14,626
Income/(loss) before consolidated subsidiaries	(289)		(49,037)		179,617		—		130,291
Income from subsidiaries	130,585		178,648		—		(309,233)		—
Net income	130,296		129,611		179,617		(309,233)		130,291
Net loss applicable to noncontrolling interest	—		—		5		—		5
Net income applicable to Piedmont	$	130,296	$	129,611	$	179,622	$	(309,233)	$	130,296


Condensed Consolidated Statements of Income
For the year ended December 31, 2017
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Revenues:


Rental and tenant reimbursement revenue	$	—	$	54,109	$	501,420	$	(2,265)	$	553,264
Property management fee revenue	—		—		18,205		(16,470)		1,735
Other property related income	—		144		19,030		—		19,174
	—		54,253		538,655		(18,735)		574,173
Expenses:
Property operating costs	—		22,805		218,371		(18,735)		222,441
Depreciation	—		12,995		106,293		—		119,288
Amortization	—		3,049		72,318		—		75,367
Impairment loss	—		87		46,374		—		46,461
General and administrative	347		6,443		22,529		—		29,319
	347		45,379		465,885		(18,735)		492,876

Other income (expense):
Interest expense	—		(56,769)		(26,715)		15,360		(68,124)
Other income/(expense)	—		9,168		6,849		(15,360)		657

Equity in income of unconsolidated joint ventures	—		3,845		—		—		3,845


Gain on sale of real estate assets	—		6,431		109,443		—		115,874
	—		(37,325)		89,577		—		52,252
Net income/(loss)	(347)		(28,451)		162,347		—		133,549
Net loss applicable to noncontrolling interest	—		—		15		—		15
Net income/(loss) applicable to Piedmont	$	(347)	$	(28,451)	$	162,362	$	—	$	133,564

Consolidating Statements of Comprehensive Income


Consolidating Statements of Comprehensive Income
For the Year Ended December 31, 2019
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Net income	$	229,261	$	198,591	$	286,213	$	(484,804)	$	229,261
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges	(5,659)		(5,659)		—		5,659		(5,659)
Plus: Reclassification of net (gain)/loss included in net income	(1,836)		(1,836)		—		1,836		(1,836)
Other comprehensive income	(7,495)		(7,495)		—		7,495		(7,495)

Comprehensive income	$	221,766	$	191,096	$	286,213	$	(477,309)	$	221,766


Consolidating Statements of Comprehensive Income
For the Year Ended December 31, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Net income	$	130,296	$	129,611	$	179,622	$	(309,233)	$	130,296
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges	692		692		—		(692)		692
Plus: Reclassification of net (gain)/loss included in net income	(300)		(300)		—		300		(300)
Other comprehensive income	392		392		—		(392)		392

Comprehensive income	$	130,688	$	130,003	$	179,622	$	(309,625)	$	130,688

Condensed Cash Flow Statement


Condensed Consolidated Statements of Cash Flows
For the year ended December 31, 2019
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Net Cash Provided By Operating Activities	$	236,214	$	220,068	$	236,477	$	(484,275)	$	208,484

Cash Flows from Investing Activities:
Investment in real estate assets and intangibles	—		(16,020)		(413,733)		—		(429,753)



Net sales proceeds from wholly-owned properties	—		113		589,654		—		589,767




Deferred lease costs paid	—		(3,220)		(22,419)		—		(25,639)
Distributions from subsidiaries	(108,918)		19,287		—		89,631		—
Net cash provided by/(used in) investing activities	(108,918)		160		153,502		89,631		134,375
Cash Flows from Financing Activities:
Debt issuance costs paid	—		(151)		—		—		(151)
Proceeds from debt	—		592,000		—		—		592,000
Repayments of debt	—		(797,000)		(1,019)		—		(798,019)


Costs of issuance of common stock	(710)		—		—		—		(710)
Value of shares withheld to pay tax obligations related to employee stock compensation	(3,295)		—		—		—		(3,295)
Repurchases of common stock as part of announced plan	(16,899)		—		—		—		(16,899)

Distributions	(106,392)		(5,420)		(389,783)		395,162		(106,433)
Net cash used in financing activities	(127,296)		(210,571)		(390,802)		395,162		(333,507)
Net increase/(decrease) in cash, cash equivalents, and restricted cash and escrows	—		9,657		(823)		518		9,352
Cash, cash equivalents, and restricted cash and escrows, beginning of year	150		34		6,368		(518)		6,034
Cash, cash equivalents, and restricted cash and escrows, end of year	$	150	$	9,691	$	5,545	$	—	$	15,386


Condensed Consolidated Statements of Cash Flows
For the year ended December 31, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Net Cash Provided By Operating Activities	$	135,755	$	141,293	$	235,562	$	(309,741)	$	202,869

Cash Flows from Investing Activities:
Investment in real estate assets and intangibles	—		(14,479)		(209,540)		—		(224,019)
Intercompany note receivable	—		88,000		—		(88,000)		—


Net sales proceeds from wholly-owned properties	—		36,572		538,655		—		575,227
Note receivable issuance	—		—		(3,200)		—		(3,200)
Note receivable payment	—		—		3,200		—		3,200

Deferred lease costs paid	—		(3,090)		(24,340)		—		(27,430)
Distributions from subsidiaries	349,135		5,405		—		(354,540)		—
Net cash provided by investing activities	349,135		112,408		304,775		(442,540)		323,778
Cash Flows from Financing Activities:
Debt issuance costs paid	—		(1,040)		—		—		(1,040)
Proceeds from debt	—		977,062		—		—		977,062
Repayments of debt	—		(1,019,000)		(1,455)		—		(1,020,455)

Intercompany note payable	—		—		(88,000)		88,000		—
Costs of issuance of common stock	(85)		—		—		—		(85)
Value of shares withheld to pay tax obligations related to employee stock compensation	(2,219)		—		—		—		(2,219)
Repurchases of common stock as part of announced plan	(298,538)		—		—		—		(298,538)

Distributions	(184,048)		(214,596)		(449,212)		663,763		(184,093)

Net cash used in financing activities	(484,890)		(257,574)		(538,667)		751,763		(529,368)
Net increase/(decrease) in cash, cash equivalents, and restricted cash and escrows	—		(3,873)		1,670		(518)		(2,721)
Cash, cash equivalents, and restricted cash and escrows, beginning of year	150		3,907		4,698		—		8,755
Cash, cash equivalents, and restricted cash and escrows, end of year	$	150	$	34	$	6,368	$	(518)	$	6,034


Condensed Consolidated Statements of Cash Flows
For the year ended December 31, 2017
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations		Consolidated
Net Cash Provided/(Used In) by Operating Activities	$	5,497	$	(18,989)	$	256,297	$	—	$	242,805

Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net	—		(1,614)		(113,479)		—		(115,093)
Intercompany note receivable	—		100		(48,710)		48,610		—


Net sales proceeds from wholly-owned properties	—		23,028		352,490		—		375,518
Net sales proceeds received from unconsolidated joint ventures	—		12,334		—		—		12,334
Investments in unconsolidated joint ventures	—		(1,162)		—		—		(1,162)

Deferred lease costs paid	—		(4,081)		(26,904)		—		(30,985)
Net cash provided by investing activities	—		28,605		163,397		48,610		240,612
Cash Flows from Financing Activities:
Debt issuance costs paid	—		(132)		—		—		(132)
Proceeds from debt	—		180,000		—		—		180,000
Repayments of debt	—		(335,000)		(141,401)		—		(476,401)

Intercompany note payable	—		(14,289)		62,899		(48,610)		—
Costs of issuance of common stock	(182)		—		—		—		(182)
Value of shares withheld to pay tax obligations related to employee stock compensation	(3,403)		—		—		—		(3,403)
Repurchases of common stock as part of announced plan	(60,474)		—		—		—		(60,474)
(Distributions to)/repayments from affiliates	180,791		160,019		(340,810)		—		—
Dividends paid and discount on dividend reinvestments	(122,229)		—		(45)		—		(122,274)
Net cash used in financing activities	(5,497)		(9,402)		(419,357)		(48,610)		(482,866)
Net increase in cash, cash equivalents, and restricted cash and escrows	—		214		337		—		551
Cash, cash equivalents, and restricted cash and escrows, beginning of year	150		3,693		4,361		—		8,204
Cash, cash equivalents, and restricted cash and escrows, end of year	$	150	$	3,907	$	4,698	$	—	$	8,755

Organization (Details) ft² in Thousands	12 Months Ended
Organization (Details) ft² in Thousands	Dec. 31, 2019 ft² market property subsidiary segment
Real Estate Properties [Line Items]
Number of wholly owned subsidiaries \| subsidiary	2
Number of real estate properties	4
Rentable square feet \| ft²	16,000
Number of operating segments \| segment	1
Piedmont Office Realty Trust, Inc.
Real Estate Properties [Line Items]
Percentage ownership by sole general partner	99.90%
Piedmont Office Holdings, Inc
Real Estate Properties [Line Items]
Percentage ownership by sole limited partner	0.10%
US
Real Estate Properties [Line Items]
Number of office markets \| market	7
In-Service Office Properties
Real Estate Properties [Line Items]
Number of real estate properties	54
Percentage of Class A commercial office space	91.20%
Redevelopment Asset
Real Estate Properties [Line Items]
Number of real estate properties	1
Rentable square feet \| ft²	487

Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) vote Joint_Venture property $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Feb. 19, 2020 USD ($)
Significant Accounting Policies [Line Items]
Number of real estate properties \| property	4
Number of joint ventures \| Joint_Venture	3
Intangible Lease Liabilities (Below-Market In-Place Leases)	$ 84,292,000	$ 94,852,000
Amortization of Intangible Lease Origination Costs and In-Place Lease Valuation included in amortization expense	62,413,000	48,940,000	$ 58,467,000
Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues	8,322,000	7,615,000	6,575,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Total	80,979,000	77,676,000
Below Market Lease, Net, Amortization Income, Fiscal Maturity [Abstract]
2020	8,304,000
2021	7,901,000
2022	6,421,000
2023	4,616,000
2024	1,706,000
Thereafter	3,778,000
Total	$ 32,726,000
Weighted-Average Amortization Period (in years)	5 years
Significant Accounting Policies [Abstract]
Provision for doubtful accounts		91,000	350,000
Capitalized internal leasing costs		300,000	300,000
Amortization of deferred lease costs	$ 50,300,000	43,600,000	50,800,000
Amortization of lease incentive	3,200,000	2,600,000	4,800,000
Amortization of fair value adjustments	500,000	500,000	500,000
Amortization of debt discount	200,000	200,000	200,000
Amortization of deferred financing costs and fair market value adjustments on notes payable	$ 2,400,000	$ 2,400,000	2,800,000
Shares-in-trust, shares authorized \| shares	150,000,000	150,000,000
Preferred stock, shares authorized \| shares	100,000,000	100,000,000
Common stock, shares authorized \| shares	750,000,000	750,000,000
Common stock, par value (in dollars per share) \| $ / shares	$ 0.01	$ 0.01
Number of votes for each share of common stock \| vote	1
Stock repurchase program, remaining authorized repurchase amount		$ 74,100,000
At-the-market offerings, maximum amount	$ 250,000,000
Dividend reinvestment plan, shareholders discount	2.00%
Income tax expense (benefit)	$ 160,000	(97,000)	13,000
Rental and tenant reimbursement revenue	511,905,000	504,410,000	553,264,000
General and administrative	37,895,000	29,713,000	29,319,000
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits
Significant Accounting Policies [Abstract]
Assets held as trading securities	600,000	400,000
Above-Market In-place Lease Assets
Significant Accounting Policies [Line Items]
Intangible lease assets	2,082,000	7,620,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2020	423,000
2021	367,000
2022	272,000
2023	97,000
2024	64,000
Thereafter	0
Total	$ 1,223,000
Weighted-Average Amortization Period (in years)	3 years
In-Place Lease Valuation
Significant Accounting Policies [Line Items]
Intangible lease assets	$ 157,101,000	157,447,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2020	22,397,000
2021	18,650,000
2022	13,950,000
2023	9,383,000
2024	4,861,000
Thereafter	10,515,000
Total	$ 79,756,000
Weighted-Average Amortization Period (in years)	5 years
Intangible Lease Origination Costs
Significant Accounting Policies [Line Items]
Intangible lease assets	$ 256,627,000	241,516,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2020	34,267,000
2021	30,112,000
2022	23,341,000
2023	16,055,000
2024	9,576,000
Thereafter	22,957,000
Total	$ 136,308,000
Weighted-Average Amortization Period (in years)	6 years
Difference between Revenue Guidance in Effect before and after Topic 606 \| Accounting Standards Update 2014-09
Significant Accounting Policies [Abstract]
Rental income			19,200,000
General and administrative			1,800,000
Restatement Adjustment \| Accounting Standards Update 2016-02
Significant Accounting Policies [Abstract]
Rental income		(411,700,000)	(455,100,000)
Tenant reimbursements		$ (92,700,000)	$ (98,200,000)
Subsequent Event
Significant Accounting Policies [Abstract]
Stock repurchase program, authorized amount				$ 200,000,000
Building
Significant Accounting Policies [Line Items]
Useful life	40 years
Building improvements \| Minimum
Significant Accounting Policies [Line Items]
Useful life	5 years
Building improvements \| Maximum
Significant Accounting Policies [Line Items]
Useful life	25 years
Land improvements \| Minimum
Significant Accounting Policies [Line Items]
Useful life	20 years
Land improvements \| Maximum
Significant Accounting Policies [Line Items]
Useful life	25 years
Furniture, fixtures, and equipment \| Minimum
Significant Accounting Policies [Line Items]
Useful life	3 years
Furniture, fixtures, and equipment \| Maximum
Significant Accounting Policies [Line Items]
Useful life	10 years
1201 Eye Street NW Associates LLC and 1225 Eye Street, NW Associates LLC
Significant Accounting Policies [Line Items]
Number of joint ventures \| Joint_Venture	2

Summary of Significant Accounting Policies - Maturities of Operating Leases Under Prior Guidance (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
2019	$ 370,495
2020	352,541
2021	337,951
2022	324,960
2023	291,603
Thereafter	1,247,649
Total	$ 2,925,199

Acquisitions (Details)	Aug. 23, 2019 USD ($) ft²	May 06, 2019 USD ($) ft²	Dec. 31, 2019 USD ($) ft² a
Business Acquisition [Line Items]
Rentable square feet \| ft²			16,000,000.0
Area of land \| a			11.7
Galleria 100
Business Acquisition [Line Items]
Ownership Percentage Acquired		100.00%
Rentable square feet \| ft²		414,293
Percentage Leased as of Acquisition (Unaudited)		91.00%
Net Contractual Purchase Price \| $		$ 95,100,000
Galleria 400 and 600
Business Acquisition [Line Items]
Ownership Percentage Acquired	100.00%
Rentable square feet \| ft²	863,623
Percentage Leased as of Acquisition (Unaudited)	84.00%
Net Contractual Purchase Price \| $	$ 231,200,000
Unsecured Debt \| Line of Credit \| Unsecured 500 Million 2018 Line Of Credit
Business Acquisition [Line Items]
Amount of line of credit \| $			$ 500,000,000

Debt (Narrative) (Details)	1 Months Ended	12 Months Ended
Debt (Narrative) (Details)	Jan. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) extension	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Weighted average interest rate		3.76%	3.76%
Interest paid		$ 64,000,000.0	$ 63,100,000	$ 67,600,000
Interest capitalized		2,100,000	$ 1,400,000	$ 200,000
Unsecured (Variable and Fixed)
Debt Instrument [Line Items]
Derivative, notional amount		$ 450,000,000
Weighted average interest rate		3.76%
$300 Million Unsecured 2013 Term Loan \| Unsecured (Variable and Fixed)
Debt Instrument [Line Items]
Repayments of debt	$ 300,000,000
Unsecured 500 Million 2018 Line Of Credit \| Unsecured (Variable and Fixed)
Debt Instrument [Line Items]
Face amount of facility		$ 500,000,000
Unsecured 500 Million 2018 Line Of Credit \| Unsecured (Variable and Fixed) \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate		0.90%
Unsecured 500 Million 2018 Line Of Credit \| Unsecured (Variable and Fixed) \| Line of Credit
Debt Instrument [Line Items]
Amount of line of credit		$ 500,000,000
Number of extension periods \| extension		2
Maturity extension period		6 months
Additional extension period		1 year
Amended and Restated $300 Million Unsecured 2011 Term Loan \| Unsecured (Variable and Fixed)
Debt Instrument [Line Items]
Face amount of facility		$ 300,000,000
Amended and Restated $300 Million Unsecured 2011 Term Loan \| Unsecured (Variable and Fixed) \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate		1.00%
$250 Million Unsecured 2018 Term Loan \| Unsecured (Variable and Fixed)
Debt Instrument [Line Items]
Face amount of facility		$ 250,000,000
Derivative, notional amount		$ 150,000,000
$250 Million Unsecured 2018 Term Loan \| Unsecured (Variable and Fixed) \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate		1.60%
Through March 29, 2020 \| $250 Million Unsecured 2018 Term Loan \| Unsecured (Variable and Fixed)
Debt Instrument [Line Items]
Derivative fixed interest rate		4.11%

Debt (Schedule of Debt) (Details)	12 Months Ended
Debt (Schedule of Debt) (Details)	Dec. 31, 2019 USD ($) extension	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Subtotal/Weighted Average	3.76%	3.76%
Amount Outstanding	$ 1,481,404,000	$ 1,685,472,000
Seven Year Interest Rate Swap Agreement \| Interest rate swaps
Debt Instrument [Line Items]
Derivative, notional amount	$ 100,000,000
Secured Debt
Debt Instrument [Line Items]
Subtotal/Weighted Average	3.79%
Amount Outstanding	$ 189,030,000	190,351,000
Premium (discount) and unamortized debt issuance costs	$ 343,000	645,000
Secured Debt \| Secured 35 Million Mortgage Loan
Debt Instrument [Line Items]
Stated Rate	5.55%
Effective Rate	3.75%
Amount Outstanding	$ 28,687,000	29,706,000
Face amount of facility	$ 35,000,000
Secured Debt \| Fixed Rate 160 Million Loan
Debt Instrument [Line Items]
Stated Rate	3.48%
Effective Rate	3.58%
Amount Outstanding	$ 160,000,000	160,000,000
Face amount of facility	$ 160,000,000
Unsecured Debt
Debt Instrument [Line Items]
Subtotal/Weighted Average	3.76%
Amount Outstanding	$ 1,292,374,000	1,495,121,000
Premium (discount) and unamortized debt issuance costs	(7,626,000)	(9,879,000)
Derivative, notional amount	$ 450,000,000
Unsecured Debt \| Amended and Restated $300 Million Unsecured 2011 Term Loan
Debt Instrument [Line Items]
Effective Rate	3.20%
Amount Outstanding	$ 300,000,000	300,000,000.0
Face amount of facility	$ 300,000,000
Unsecured Debt \| Amended and Restated $300 Million Unsecured 2011 Term Loan \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate	1.00%
Unsecured Debt \| Unsecured 500 Million 2018 Line Of Credit
Debt Instrument [Line Items]
Face amount of facility	$ 500,000,000
Unsecured Debt \| Unsecured 500 Million 2018 Line Of Credit \| Line of Credit
Debt Instrument [Line Items]
Effective Rate	2.70%
Amount Outstanding	$ 0	205,000,000
Additional extension period	1 year
Number of extension periods \| extension	2
Maturity extension period	6 months
Unsecured Debt \| Unsecured 500 Million 2018 Line Of Credit \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate	0.90%
Unsecured Debt \| Unsecured Senior 350 Million Notes
Debt Instrument [Line Items]
Stated Rate	3.40%
Effective Rate	3.43%
Amount Outstanding	$ 350,000,000	350,000,000
Face amount of facility	$ 350,000,000
Unsecured Debt \| Unsecured Senior 400 Million Notes
Debt Instrument [Line Items]
Stated Rate	4.45%
Effective Rate	4.10%
Amount Outstanding	$ 400,000,000	400,000,000
Face amount of facility	$ 400,000,000
Unsecured Debt \| $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Effective Rate	3.83%
Amount Outstanding	$ 250,000,000	$ 250,000,000
Face amount of facility	250,000,000
Derivative, notional amount	$ 150,000,000
Unsecured Debt \| $250 Million Unsecured 2018 Term Loan \| Through March 29, 2020
Debt Instrument [Line Items]
Derivative fixed interest rate	4.11%
Unsecured Debt \| $250 Million Unsecured 2018 Term Loan \| From March 30, 2020 Through March 31, 2025
Debt Instrument [Line Items]
Derivative fixed interest rate	4.21%
Unsecured Debt \| $250 Million Unsecured 2018 Term Loan \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate	1.60%

Debt (Maturities of Long-term Debt) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Debt Disclosure [Abstract]
2020	$ 985
2021	327,702
2022	160,000
2023	350,000
2024	400,000
Thereafter	250,000
Total	$ 1,488,687

Derivative Instruments (Narrative) (Details)	1 Months Ended	12 Months Ended
Derivative Instruments (Narrative) (Details)	Jan. 31, 2018 USD ($) contract	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Maximum length of time of cash flow hedge		63 months
Gain (loss) to be reclassified		$ 300,000
Interest rate swaps
Derivative [Line Items]
Number of terminated derivatives \| contract	6
Gain on cash flow hedging instruments		100,000
Credit Risk Contract
Derivative [Line Items]
Assets needed for immediate settlement, aggregate fair value		5,300,000
Unsecured Debt \| $300 Million Unsecured 2013 Term Loan
Derivative [Line Items]
Repayments of debt	$ 300,000,000
Proceeds from termination of interest rate swap agreement	800,000
Unsecured Debt \| $300 Million Unsecured 2013 Term Loan \| Interest rate swaps
Derivative [Line Items]
Net loss on interest rate cash flow hedge termination	$ 1,300,000
Unsecured Debt \| Amended and Restated $300 Million Unsecured 2011 Term Loan
Derivative [Line Items]
Face amount of facility		300,000,000
Unsecured Debt \| $250 Million Unsecured 2018 Term Loan
Derivative [Line Items]
Face amount of facility		250,000,000
Amount of hedged debt		$ 150,000,000

Derivative Instruments (Schedule of Notional Amounts of Outstanding Derivative Positions) (Details) - Unsecured Debt	Dec. 31, 2019 USD ($) contract
Derivative [Line Items]
Derivative, notional amount	$ 450,000,000
Amended and Restated $300 Million Unsecured 2011 Term Loan
Derivative [Line Items]
Face amount of facility	$ 300,000,000
Amended and Restated $300 Million Unsecured 2011 Term Loan \| Interest Rate Swap 1 through 3
Derivative [Line Items]
Number of swap agreements \| contract	3
Derivative, notional amount	$ 300,000,000
$250 Million Unsecured 2018 Term Loan
Derivative [Line Items]
Derivative, notional amount	150,000,000
Face amount of facility	$ 250,000,000
$250 Million Unsecured 2018 Term Loan \| Interest Rate Swap 4 through 5
Derivative [Line Items]
Number of swap agreements \| contract	2
Derivative, notional amount	$ 100,000,000
$250 Million Unsecured 2018 Term Loan \| Interest Rate Swap 6
Derivative [Line Items]
Number of swap agreements \| contract	1
Derivative, notional amount	$ 50,000,000

Derivative Instruments (Schedule of Interest Rate Derivatives) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross derivative assets	$ 0	$ 1,199
Gross derivative liabilities	(5,121)	(839)
Net derivative asset/(liability)	$ (5,121)	$ 360

Derivative Instruments (Effect on other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI	$ (5,659)	$ 692	$ 2,479
Total amount of Interest Expense presented in the consolidated statements of income	(61,594)	(61,023)	(68,124)
Total amount of Loss on Extinguishment of Debt presented in the consolidated statements of income (1)	0	(1,680)	0
Write off of deferred debt issuance cost	400
Interest rate swaps
Derivative [Line Items]
Total amount of Interest Expense presented in the consolidated statements of income	(61,594)	(61,023)	(68,124)
Interest Expense \| Interest rate swaps
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI	(5,659)	692	2,479
Amount of gain/(loss) reclassified from OCI	1,836	1,558	(3,502)
Gain (Loss) On Extinguishment Of Debt \| Interest rate swaps
Derivative [Line Items]
Amount of gain/(loss) reclassified from OCI	$ 0	$ (1,258)	$ 0

Fair Value Measurements of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps	$ 0	$ 1,199
Interest rate swaps	5,121	839
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	13,545	4,571
Tenant receivables, net and Notes receivable	8,226	10,800
Restricted cash and escrows	1,841	1,463
Accounts payable and accrued expenses	50,049	47,328
Debt, net	1,481,404	1,685,472
Carrying Value \| Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps	0	1,199
Interest rate swaps	5,121	839
Estimated Fair Value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	13,545	4,571
Tenant receivables, net and Notes receivable	8,226	10,800
Restricted cash and escrows	1,841	1,463
Accounts payable and accrued expenses	50,049	47,328
Estimated Fair Value \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, net	1,536,687	1,698,213
Estimated Fair Value \| Level 2 \| Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps	0	1,199
Interest rate swaps	$ 5,121	$ 839

Impairment Loss on Real Estate Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment loss on real estate assets	$ 8,953	$ 0	$ 46,461
Capitalization
Impaired Long-Lived Assets Held and Used [Line Items]
Loss on impairment, measurement input	14.00%
Estimated Selling Costs
Impaired Long-Lived Assets Held and Used [Line Items]
Loss on impairment, measurement input	0.75%
Disposal Group, Held-for-sale, Not Discontinued Operations \| The Dupree
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment loss on real estate assets	$ 1,953	0	0
Disposal Group, Held-for-sale, Not Discontinued Operations \| 600 Corporate Drive
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment loss on real estate assets	7,000	0	0
Disposal Group, Held-for-sale, Not Discontinued Operations \| Disposal Group of 13 Assets
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment loss on real estate assets	$ 0	$ 0	$ 46,461

Commitments and Contingencies (Details) ft² in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) ft² Joint_Venture	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Number of unrecorded tenant allowance commitments \| Joint_Venture	1
Unrecorded tenant allowance commitment	$ 57.4
Unrecorded tenant allowance renewal term	20 years
Unrecorded tenant allowance expansion area \| ft²	520
Collectibility of Tenant Reimbursements
Loss Contingencies [Line Items]
Recovery of previously recognized loss contingencies	$ 0.6
Additional expense related to such tenant audits/disputes		$ 0.5	$ 0.3

Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transactions [Abstract]
Related party consulting agreement expense recognized	$ 0.2	$ 0.3	$ 0.1

Stock Based Compensation (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense and directors' fees related to stock awards	$ 15.1	$ 9.7	$ 9.5
Compensation expense, non-vested awards	$ 13.6	$ 8.6	$ 7.7
Number of shares issued to employees, directors and officers (in shares)	292,675
Nonvested awards, total compensation cost not yet recognized	$ 3.5
Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested awards, total compensation cost not yet recognized, period for recognition	1 year
Stock Awards \| Independent directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year

Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	May 15, 2019	May 03, 2019	May 17, 2018	May 18, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 15, 2019	May 03, 2019	May 17, 2018	May 18, 2017
Stock Awards
Rollforward of deferred stock award activity
Unvested and Potential Stock Awards as of the beginning of the year (in shares)					1,227,483
Unvested and Potential Stock Awards as of end of the year (in shares)					1,045,020	1,227,483
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at beginning of year (in dollars per share)					$ 23.14
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)					25.15	$ 23.14
Grant Date Fair Value (in dollars per share)					$ 25.15	$ 23.14
Unvested shares (in shares)					1,045,020	1,227,483
Deferred Stock Award
Rollforward of deferred stock award activity
Deferred Stock Awards Granted (in shares)					354,057
Deferred Stock Awards Vested (in shares)					(440,450)
Deferred Stock Awards Forfeited (in shares)					(15,116)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Deferred Stock Awards Granted, Weighted-Average Grant Date Fair (in dollars per share)					$ 21.02	$ 17.84	$ 21.38
Deferred Stock Awards Vested, Weighted-Average Grant Date Fair Value (in dollars per share)					19.66
Deferred Stock Awards Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)					$ 19.19
Total Grant Date Fair Value of Deferred Stock Vested During the Period					$ 8,658	$ 6,378	$ 5,899
Performance Shares
Rollforward of deferred stock award activity
Increase in Estimated Potential Future Performance Share Awards, net of forfeitures (in shares)					271,450
Deferred Stock Awards Vested (in shares)					(352,404)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Increase in Estimated Potential Future Performance Share Awards, Weighted Average Grant Date Fair Value (in dollars per share)					$ 28.34
Deferred Stock Awards Vested, Weighted-Average Grant Date Fair Value (in dollars per share)					$ 25.83
Share-based Liability Awards Paid During the Period					$ 6,683	$ 2,947	$ 2,877
Deferred Stock Award, Granted May 18, 2017 \| Deferred Stock Award
Rollforward of deferred stock award activity
Unvested and Potential Stock Awards as of end of the year (in shares)					40,871
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)				$ 21.38
Net Shares Granted (in shares)											196,036
Grant Date Fair Value (in dollars per share)				$ 21.38							$ 21.38
Unvested shares (in shares)					40,871
Deferred Stock Award, Granted May 18, 2017 \| Share-based Compensation Award, Tranche One \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage				25.00%
Deferred Stock Award, Granted May 18, 2017 \| Share-based Compensation Award, Tranche Two \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage				25.00%
Deferred Stock Award, Granted May 18, 2017 \| Share-based Compensation Award, Tranche Three \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage				25.00%
Deferred Stock Award, Granted May 18, 2017 \| Share-based Compensation Award, Tranche Four \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage				25.00%
Performance Share Program Award, Granted May 18, 2017 \| Performance Shares
Rollforward of deferred stock award activity
Unvested and Potential Stock Awards as of end of the year (in shares)					153,368
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)				$ 30.45
Net Shares Granted (in shares)											0
Grant Date Fair Value (in dollars per share)				$ 30.45							$ 30.45
Unvested shares (in shares)					153,368
Deferred Stock Award, Granted May 17, 2018 \| Deferred Stock Award
Rollforward of deferred stock award activity
Unvested and Potential Stock Awards as of end of the year (in shares)					108,031
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)			$ 17.84
Net Shares Granted (in shares)										271,169
Grant Date Fair Value (in dollars per share)			$ 17.84							$ 17.84
Unvested shares (in shares)					108,031
Deferred Stock Award, Granted May 17, 2018 \| Share-based Compensation Award, Tranche One \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage			25.00%
Deferred Stock Award, Granted May 17, 2018 \| Share-based Compensation Award, Tranche Two \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage			25.00%
Deferred Stock Award, Granted May 17, 2018 \| Share-based Compensation Award, Tranche Three \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage			25.00%
Deferred Stock Award, Granted May 17, 2018 \| Share-based Compensation Award, Tranche Four \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage			25.00%
Performance Share Program Award, Granted May 17, 2018 \| Performance Shares
Rollforward of deferred stock award activity
Unvested and Potential Stock Awards as of end of the year (in shares)					200,674
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)			$ 23.52
Net Shares Granted (in shares)										0
Grant Date Fair Value (in dollars per share)			$ 23.52							$ 23.52
Unvested shares (in shares)					200,674
Deferred Stock Award, Granted May 15, 2019 \| Deferred Stock Award \| Independent directors
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage	100.00%
Deferred Stock Award, Granted May 15, 2019 \| Performance Shares
Rollforward of deferred stock award activity
Unvested and Potential Stock Awards as of end of the year (in shares)					25,974
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)	$ 20.79
Net Shares Granted (in shares)								25,974
Grant Date Fair Value (in dollars per share)	$ 20.79							$ 20.79
Unvested shares (in shares)					25,974
Deferred Stock Award, Granted May 3, 2019 \| Performance Shares
Rollforward of deferred stock award activity
Unvested and Potential Stock Awards as of end of the year (in shares)					194,816
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)		$ 21.04
Net Shares Granted (in shares)									300,825
Grant Date Fair Value (in dollars per share)		$ 21.04							$ 21.04
Unvested shares (in shares)					194,816
Deferred Stock Award, Granted May 3, 2019 \| Share-based Compensation Award, Tranche One \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage		25.00%
Deferred Stock Award, Granted May 3, 2019 \| Share-based Compensation Award, Tranche Two \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage		25.00%
Deferred Stock Award, Granted May 3, 2019 \| Share-based Compensation Award, Tranche Three \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage		25.00%
Deferred Stock Award, Granted May 3, 2019 \| Share-based Compensation Award, Tranche Four \| Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Vesting percentage		25.00%
Performance Share Program Award, Granted May 3, 2019 \| Performance Shares
Rollforward of deferred stock award activity
Unvested and Potential Stock Awards as of end of the year (in shares)					321,286
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)		$ 29.43
Net Shares Granted (in shares)									0
Grant Date Fair Value (in dollars per share)		$ 29.43							$ 29.43
Unvested shares (in shares)					321,286

Earnings Per Share (Details) - shares	12 Months Ended
Earnings Per Share (Details) - shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	100,000	100,000	100,000
Weighted-average common shares outstanding - basic (in shares)	125,709,207	130,161,202	145,043,503
Plus: Incremental weighted-average shares from time-vested deferred and performance stock awards (in shares)	473,000	475,000	336,000
Weighted-average common shares outstanding - diluted (in shares)	126,182,137	130,635,650	145,379,994

Operating Leases (Rental Income Maturity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
2020	$ 384,891
2021	378,312
2022	362,977
2023	329,490
2024	287,755
Thereafter	1,520,051
Total	3,263,476
Fixed payments	418,246	$ 411,667	$ 455,125
Variable payments	93,659	92,743	98,139
Rental and tenant reimbursement revenue	$ 511,905	$ 504,410	$ 553,264

Operating Leases (Operating Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Fixed payments	$ 418,246	$ 411,667	$ 455,125
Variable payments	93,659	92,743	98,139
Total Rental and Tenant Reimbursement Revenue	$ 511,905	$ 504,410	$ 553,264

Operating Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
Lessor, Lease, Description [Line Items]
Weighted-average lease term	2 years
Weighted-average discount rate	3.35%
Accounting Standards Update 2016-02
Lessor, Lease, Description [Line Items]
Right-of-use asset		$ 0.2
Lease liability		$ 0.2
Operating lease cost	$ 0.1

Property Dispositions and Assets Held for Sale (Property Dispositions) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 05, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 04, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notes receivable		$ 0	$ 0
Secured Debt \| Secured Promissory Note
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Notes receivable					$ 3,200
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Sarasota Commerce Center II
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets				$ 6,493
Net Sales Proceeds				23,090
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Two Independence Square
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets				109,381
Net Sales Proceeds				352,428
Adjustment to gain on sale of real estate assets	$ 6,100
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| 8560 Upland Drive
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets				3,683
Net Sales Proceeds				$ 12,334
Piedmont’s ownership percentage		72.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| 2017 Disposition Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets			45,275
Net Sales Proceeds			419,644
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| 800 North Brand Boulevard
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets			30,416
Net Sales Proceeds			$ 155,583
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| ONE INDEPENDENCE SQUARE
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets		$ 33,176
Net Sales Proceeds		163,623
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| The Dupree
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets		0
Net Sales Proceeds		12,631
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| 500 WEST MONROE STREET
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets		157,739
Net Sales Proceeds		$ 408,851

Property Dispositions and Assets Held for Sale (Assets Held-for-Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total other assets held for sale, net	$ 0	$ 61,233
Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total real estate assets held for sale, net	0	331,068
Straight-line rent receivables	0	36,584
Prepaid expenses and other assets	0	1,095
Deferred lease costs, less accumulated amortization of $0 and $9,138 as of December 31, 2019 and 2018, respectively	0	23,554
Accumulated amortization on deferred lease costs	0	(9,138)
Total other assets held for sale, net	0	61,233
Accrued expenses	0	8,780
Disposal Group, Held-for-sale, Not Discontinued Operations \| Land
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net:	0	67,552
Disposal Group, Held-for-sale, Not Discontinued Operations \| Building and building improvements
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net:	0	261,463
Accumulated depreciation, real estate assets held for sale	0	(102,476)
Disposal Group, Held-for-sale, Not Discontinued Operations \| Construction in progress
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net:	$ 0	$ 2,053

Supplemental Disclosures for the Statement of Consolidated Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Accrued capital expenditures and deferred lease costs	$ 38,366	$ 10,854	$ 11,276
Change in accrued dividends and discount on dividend reinvestments	(545)	(74,828)	71,267
Change in accrued share repurchases as part of an announced plan	(4,417)	3,140	1,276
Investment in consolidated joint venture	0	0	63,026
Cash and cash equivalents	13,545	4,571	7,382	$ 6,992
Restricted cash and escrows	1,841	1,463	1,373	1,212
Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows	$ 15,386	$ 6,034	$ 8,755	$ 8,204

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Net income applicable to Piedmont	$ 162,478	$ 8,422	$ 8,153	$ 50,208	$ 45,410	$ 16,114	$ 10,942	$ 57,830	$ 229,261	$ 130,296	$ 133,564
Depreciation and amortization expense recognized for financial reporting purposes in excess of amounts recognized for income tax purposes									10,381	54,420	62,916
Rental income accrued for income tax purposes less than amounts for financial reporting purposes									(34,804)	(9,681)	(25,432)
Net amortization of above/below-market lease intangibles for income tax purposes in excess of amounts for financial reporting purposes									(7,698)	(7,453)	(6,041)
Gain on disposal of property for financial reporting purposes less than/(in excess of) amounts for income tax purposes									(85,463)	(36,241)	10,068
Other expenses, including impairment loss on real estate assets, for financial reporting purposes in excess of/ (less than) amounts for income tax purposes									23,127	(37,394)	49,859
Income tax basis net income, prior to dividends paid deduction									$ 135,390	$ 91,794	$ 225,082
Ordinary income, Percent									29.82%	100.00%	53.61%
Return of capital, Percent									0.00%	0.00%	0.00%
Capital gains, Percent									70.18%	0.00%	46.39%
Common Stock Dividends, Percent									100.00%	100.00%	100.00%
Tax basis of total assets	3,300,000				3,600,000				$ 3,300,000	$ 3,600,000
Accrued interest and penalties related to uncertain tax positions	$ 1,000				$ 2,400				1,000	2,400
Recovery of tax expense, including potential interest and penalties									1,400	1,400	$ 100
Piedmont Washington Properties, Inc
Income Taxes [Line Items]
Taxable income for subsidiary in excess of/(less than) amount for financial reporting purposes									411	(2,089)	176
Piedmont Office Holdings, Inc
Income Taxes [Line Items]
Taxable income for subsidiary in excess of/(less than) amount for financial reporting purposes									$ 175	$ (64)	$ (28)

Quarterly Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 134,153	$ 135,421	$ 130,668	$ 132,936	$ 137,185	$ 129,708	$ 129,174	$ 129,900	$ 533,178	$ 525,967	$ 574,173
Gain/(loss) on sale of real estate assets	157,640	32	1,451	37,887	30,505	0	(23)	45,209	197,010	75,691	115,874
Net income	162,476	8,419	8,152	50,209	45,409	16,114	10,940	57,828	229,256	130,291	133,549
Net income/(loss) applicable to Piedmont	$ 162,478	$ 8,422	$ 8,153	$ 50,208	$ 45,410	$ 16,114	$ 10,942	$ 57,830	$ 229,261	$ 130,296	$ 133,564
Basic and diluted earnings per share (in dollars per share)	$ 1.29	$ 0.07	$ 0.06	$ 0.40					$ 1.82	$ 1.00	$ 0.92
Basic earnings per share (in dollars per share)					$ 0.35	$ 0.13	$ 0.09	$ 0.43
Diluted earnings per share (in dollars per share)					0.35	0.13	0.09	0.42
Dividends declared (in dollars per share)	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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+ Details

Guarantor and Non-Guarantor Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real estate assets, at cost:
Land	$ 506,389		$ 470,432
Buildings and improvements, less accumulated depreciation	2,325,222		2,121,570
Intangible lease assets, less accumulated amortization	80,979		77,676
Construction in progress	29,920		15,848
Real estate assets held for sale, net	0		331,068
Total real estate assets	2,942,510		3,016,594
Cash and cash equivalents	13,545		4,571	$ 7,382	$ 6,992
Tenant and straight-line receivables, net	159,344		147,562
Investment in subsidiaries	0		0
Notes receivable	0		0
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	27,268		27,353
Goodwill	98,918		98,918
Deferred lease costs, net	275,172		236,198
Other assets held for sale, net	0		61,233
Total assets	3,516,757		3,592,429
Liabilities:
Debt, net	1,481,404		1,685,472
Accounts payable, accrued expenses, dividends payable, interest rate swaps and accrued capital expenditures	149,044		121,550
Deferred income	34,609		28,779
Intangible lease liabilities, net	32,726		35,708
Liabilities held for sale, net	0		8,780
Total liabilities	1,697,783		1,880,289
Equity:
Total stockholders’ equity	1,818,974		1,712,140	$ 1,986,489	$ 2,097,703
Total liabilities and stockholders’ equity	3,516,757		3,592,429
Eliminations
Real estate assets, at cost:
Land	0		0
Buildings and improvements, less accumulated depreciation	(300)		(300)
Intangible lease assets, less accumulated amortization	0		0
Construction in progress	0		0
Real estate assets held for sale, net			0
Total real estate assets	(300)		(300)
Cash and cash equivalents	0		(518)
Tenant and straight-line receivables, net	0		0
Investment in subsidiaries	(4,656,833)		(4,448,625)
Notes receivable	(145,310)		(145,310)
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	(24)		(24)
Goodwill	0		0
Deferred lease costs, net	0		0
Other assets held for sale, net			0
Total assets	(4,802,467)		(4,594,777)
Liabilities:
Debt, net	(145,310)		(145,310)
Accounts payable, accrued expenses, dividends payable, interest rate swaps and accrued capital expenditures	(24)		(542)
Deferred income	0		0
Intangible lease liabilities, net	0		0
Liabilities held for sale, net			0
Total liabilities	(145,334)		(145,852)
Equity:
Total stockholders’ equity	(4,657,133)	$ (4,448,925)	(4,448,925)
Total liabilities and stockholders’ equity	(4,802,467)		(4,594,777)
Piedmont (Parent) (Guarantor) \| Reportable Legal Entities
Real estate assets, at cost:
Land	0		0
Buildings and improvements, less accumulated depreciation	0		0
Intangible lease assets, less accumulated amortization	0		0
Construction in progress	0		0
Real estate assets held for sale, net			0
Total real estate assets	0		0
Cash and cash equivalents	150		150
Tenant and straight-line receivables, net	0		0
Investment in subsidiaries	1,845,797		1,744,122
Notes receivable	0		0
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	0		42
Goodwill	0		0
Deferred lease costs, net	0		0
Other assets held for sale, net			0
Total assets	1,845,947		1,744,314
Liabilities:
Debt, net	0		0
Accounts payable, accrued expenses, dividends payable, interest rate swaps and accrued capital expenditures	26,973		32,174
Deferred income	0		0
Intangible lease liabilities, net	0		0
Liabilities held for sale, net			0
Total liabilities	26,973		32,174
Equity:
Total stockholders’ equity	1,818,974		1,712,140
Total liabilities and stockholders’ equity	1,845,947		1,744,314
Piedmont OP (the Issuer) \| Reportable Legal Entities
Real estate assets, at cost:
Land	36,094		36,094
Buildings and improvements, less accumulated depreciation	177,798		176,927
Intangible lease assets, less accumulated amortization	0		0
Construction in progress	2,412		5,708
Real estate assets held for sale, net			0
Total real estate assets	216,304		218,729
Cash and cash equivalents	9,674		0
Tenant and straight-line receivables, net	16,450		16,143
Investment in subsidiaries	2,810,875		2,704,337
Notes receivable	810		810
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	6,180		5,682
Goodwill	98,918		98,918
Deferred lease costs, net	16,249		15,158
Other assets held for sale, net			0
Total assets	3,175,460		3,059,777
Liabilities:
Debt, net	1,292,334		1,495,065
Accounts payable, accrued expenses, dividends payable, interest rate swaps and accrued capital expenditures	21,069		15,382
Deferred income	3,505		2,274
Intangible lease liabilities, net	0		0
Liabilities held for sale, net			0
Total liabilities	1,316,908		1,512,721
Equity:
Total stockholders’ equity	1,858,552	$ 1,547,056	1,547,056
Total liabilities and stockholders’ equity	3,175,460		3,059,777
Non-Guarantor Subsidiaries \| Reportable Legal Entities
Real estate assets, at cost:
Land	470,295		434,338
Buildings and improvements, less accumulated depreciation	2,147,724		1,944,943
Intangible lease assets, less accumulated amortization	80,979		77,676
Construction in progress	27,508		10,140
Real estate assets held for sale, net			331,068
Total real estate assets	2,726,506		2,798,165
Cash and cash equivalents	3,721		4,939
Tenant and straight-line receivables, net	142,894		131,419
Investment in subsidiaries	161		166
Notes receivable	144,500		144,500
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	21,112		21,653
Goodwill	0		0
Deferred lease costs, net	258,923		221,040
Other assets held for sale, net			61,233
Total assets	3,297,817		3,383,115
Liabilities:
Debt, net	334,380		335,717
Accounts payable, accrued expenses, dividends payable, interest rate swaps and accrued capital expenditures	101,026		74,536
Deferred income	31,104		26,505
Intangible lease liabilities, net	32,726		35,708
Liabilities held for sale, net			8,780
Total liabilities	499,236		481,246
Equity:
Total stockholders’ equity	2,798,581		2,901,869
Total liabilities and stockholders’ equity	$ 3,297,817		$ 3,383,115

Guarantor and Non-Guarantor Financial Information - Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Rental and tenant reimbursement revenue									$ 511,905	$ 504,410	$ 553,264
Total revenues	$ 134,153	$ 135,421	$ 130,668	$ 132,936	$ 137,185	$ 129,708	$ 129,174	$ 129,900	533,178	525,967	574,173
Expenses:
Property operating costs									211,380	209,338	222,441
Depreciation									106,015	107,956	119,288
Amortization									76,666	63,295	75,367
Impairment loss on real estate assets									8,953	0	46,461
General and administrative									37,895	29,713	29,319
Expenses									440,909	410,302	492,876
Other income (expense):
Interest expense									(61,594)	(61,023)	(68,124)
Other income/(expense)									1,571	1,638	657
Equity in income of unconsolidated joint ventures									0	0	3,845
Loss on extinguishment of debt									0	(1,680)	0
Gain on sale of real estate assets, net	157,640	32	1,451	37,887	30,505	0	(23)	45,209	197,010	75,691	115,874
Nonoperating Income (Expense)									136,987	14,626	52,252
Income/(loss) before consolidated subsidiaries									229,256	130,291
Income from subsidiaries									0	0
Net income/(loss)	162,476	8,419	8,152	50,209	45,409	16,114	10,940	57,828	229,256	130,291	133,549
Net loss applicable to noncontrolling interest									5	5	15
Net income applicable to Piedmont	$ 162,478	$ 8,422	$ 8,153	$ 50,208	$ 45,410	$ 16,114	$ 10,942	$ 57,830	229,261	130,296	133,564
Eliminations
Revenues:
Rental and tenant reimbursement revenue									(2,834)	(2,473)	(2,265)
Total revenues									(18,798)	(18,141)	(18,735)
Expenses:
Property operating costs									(18,798)	(18,141)	(18,735)
Depreciation									0	0	0
Amortization									0	0	0
Impairment loss on real estate assets									0		0
General and administrative									0	0	0
Expenses									(18,798)	(18,141)	(18,735)
Other income (expense):
Interest expense									7,535	7,630	15,360
Other income/(expense)									(7,535)	(7,630)	(15,360)
Equity in income of unconsolidated joint ventures											0
Loss on extinguishment of debt										0
Gain on sale of real estate assets, net									0	0	0
Nonoperating Income (Expense)									0	0	0
Income/(loss) before consolidated subsidiaries									0	0
Income from subsidiaries									(484,804)	(309,233)
Net income/(loss)									(484,804)	(309,233)	0
Net loss applicable to noncontrolling interest									0	0	0
Net income applicable to Piedmont									(484,804)	(309,233)	0
Piedmont (Parent) (Guarantor) \| Reportable Legal Entities
Revenues:
Rental and tenant reimbursement revenue									0	0	0
Total revenues									0	0	0
Expenses:
Property operating costs									0	0	0
Depreciation									0	0	0
Amortization									0	0	0
Impairment loss on real estate assets									0		0
General and administrative									218	289	347
Expenses									218	289	347
Other income (expense):
Interest expense									0	0	0
Other income/(expense)									0	0	0
Equity in income of unconsolidated joint ventures											0
Loss on extinguishment of debt										0
Gain on sale of real estate assets, net									0	0	0
Nonoperating Income (Expense)									0	0	0
Income/(loss) before consolidated subsidiaries									(218)	(289)
Income from subsidiaries									229,479	130,585
Net income/(loss)									229,261	130,296	(347)
Net loss applicable to noncontrolling interest									0	0	0
Net income applicable to Piedmont									229,261	130,296	(347)
Piedmont OP (the Issuer) \| Reportable Legal Entities
Revenues:
Rental and tenant reimbursement revenue									46,669	44,710	54,109
Total revenues									46,827	44,840	54,253
Expenses:
Property operating costs									21,314	19,583	22,805
Depreciation									12,171	11,514	12,995
Amortization									1,940	1,990	3,049
Impairment loss on real estate assets									7,000		87
General and administrative									6,716	6,576	6,443
Expenses									49,141	39,663	45,379
Other income (expense):
Interest expense									(54,721)	(54,095)	(56,769)
Other income/(expense)									188	144	9,168
Equity in income of unconsolidated joint ventures											3,845
Loss on extinguishment of debt										(1,680)
Gain on sale of real estate assets, net									113	1,417	6,431
Nonoperating Income (Expense)									(54,420)	(54,214)	(37,325)
Income/(loss) before consolidated subsidiaries									(56,734)	(49,037)
Income from subsidiaries									255,325	178,648
Net income/(loss)									198,591	129,611	(28,451)
Net loss applicable to noncontrolling interest									0	0	0
Net income applicable to Piedmont									198,591	129,611	(28,451)
Non-Guarantor Subsidiaries \| Reportable Legal Entities
Revenues:
Rental and tenant reimbursement revenue									468,070	462,173	501,420
Total revenues									505,149	499,268	538,655
Expenses:
Property operating costs									208,864	207,896	218,371
Depreciation									93,844	96,442	106,293
Amortization									74,726	61,305	72,318
Impairment loss on real estate assets									1,953		46,374
General and administrative									30,961	22,848	22,529
Expenses									410,348	388,491	465,885
Other income (expense):
Interest expense									(14,408)	(14,558)	(26,715)
Other income/(expense)									8,918	9,124	6,849
Equity in income of unconsolidated joint ventures											0
Loss on extinguishment of debt										0
Gain on sale of real estate assets, net									196,897	74,274	109,443
Nonoperating Income (Expense)									191,407	68,840	89,577
Income/(loss) before consolidated subsidiaries									286,208	179,617
Income from subsidiaries									0	0
Net income/(loss)									286,208	179,617	162,347
Net loss applicable to noncontrolling interest									5	5	15
Net income applicable to Piedmont									286,213	179,622	162,362
Management Service
Revenues:
Property management fee revenue									3,398	1,450	1,735
Management Service \| Eliminations
Revenues:
Property management fee revenue									(15,964)	(15,668)	(16,470)
Management Service \| Piedmont (Parent) (Guarantor) \| Reportable Legal Entities
Revenues:
Property management fee revenue									0	0	0
Management Service \| Piedmont OP (the Issuer) \| Reportable Legal Entities
Revenues:
Property management fee revenue									0	0	0
Management Service \| Non-Guarantor Subsidiaries \| Reportable Legal Entities
Revenues:
Property management fee revenue									19,362	17,118	18,205
Other property related income
Revenues:
Property management fee revenue									17,875	20,107	19,174
Other property related income \| Eliminations
Revenues:
Property management fee revenue									0	0	0
Other property related income \| Piedmont (Parent) (Guarantor) \| Reportable Legal Entities
Revenues:
Property management fee revenue									0	0	0
Other property related income \| Piedmont OP (the Issuer) \| Reportable Legal Entities
Revenues:
Property management fee revenue									158	130	144
Other property related income \| Non-Guarantor Subsidiaries \| Reportable Legal Entities
Revenues:
Property management fee revenue									$ 17,717	$ 19,977	$ 19,030

Guarantor and Non-Guarantor Financial Information - Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income applicable to Piedmont	$ 162,478	$ 8,422	$ 8,153	$ 50,208	$ 45,410	$ 16,114	$ 10,942	$ 57,830	$ 229,261	$ 130,296	$ 133,564
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 5)									(5,659)	692	2,479
Plus: Reclassification of net (gain)/loss included in net income									(1,836)	(300)	3,502
Other comprehensive income									(7,495)	392	6,060
Comprehensive income applicable to Piedmont									221,766	130,688	139,624
Reportable Legal Entities \| Piedmont (Parent) (Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income applicable to Piedmont									229,261	130,296	(347)
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 5)									(5,659)	692
Plus: Reclassification of net (gain)/loss included in net income									(1,836)	(300)
Other comprehensive income									(7,495)	392
Comprehensive income applicable to Piedmont									221,766	130,688
Reportable Legal Entities \| Piedmont OP (the Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income applicable to Piedmont									198,591	129,611	(28,451)
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 5)									(5,659)	692
Plus: Reclassification of net (gain)/loss included in net income									(1,836)	(300)
Other comprehensive income									(7,495)	392
Comprehensive income applicable to Piedmont									191,096	130,003
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income applicable to Piedmont									286,213	179,622	162,362
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 5)									0	0
Plus: Reclassification of net (gain)/loss included in net income									0	0
Other comprehensive income									0	0
Comprehensive income applicable to Piedmont									286,213	179,622
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income applicable to Piedmont									(484,804)	(309,233)	$ 0
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 5)									5,659	(692)
Plus: Reclassification of net (gain)/loss included in net income									1,836	300
Other comprehensive income									7,495	(392)
Comprehensive income applicable to Piedmont									$ (477,309)	$ (309,625)

Guarantor and Non-Guarantor Financial Information - Cash Flows (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided By/(Used In) Operating Activities	$ 208,484,000	$ 202,869,000	$ 242,805,000
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	(429,753,000)	(224,019,000)	(115,093,000)
Net sale proceeds from wholly-owned properties	589,767,000	575,227,000	375,518,000
Intercompany note receivable		0	0
Net sale proceeds received from unconsolidated joint ventures	0	0	12,334,000
Note receivable issuance	0	(3,200,000)	0
Note receivable payment	0	3,200,000	0
Investments in unconsolidated joint ventures			(1,162,000)
Deferred lease costs paid	(25,639,000)	(27,430,000)	(30,985,000)
Distributions from subsidiaries	0	0
Net cash provided by/(used in) investing activities	134,375,000	323,778,000	240,612,000
Cash Flows from Financing Activities:
Debt issuance costs paid	(151,000)	(1,040,000)	(132,000)
Proceeds from debt	592,000,000	977,062,000	180,000,000
Repayments of debt	(798,019,000)	(1,020,455,000)	(476,401,000)
Intercompany note payable		0	0
Costs of issuance of common stock	(710,000)	(85,000)	(182,000)
Value of shares withheld for payment of taxes related to employee stock compensation	(3,295,000)	(2,219,000)	(3,403,000)
Repurchases of common stock as part of announced plan	(16,899,000)	(298,538,000)	(60,474,000)
(Distributions to)/repayments from affiliates			0
Dividends paid and discount on dividend reinvestments	(106,433,000)	(184,093,000)	(122,274,000)
Net cash used in financing activities	(333,507,000)	(529,368,000)	(482,866,000)
Net increase/(decrease) in cash, cash equivalents, and restricted cash and escrows	9,352,000	(2,721,000)	551,000
Cash, cash equivalents, and restricted cash and escrows, beginning of year	6,034,000	8,755,000	8,204,000
Cash, cash equivalents, and restricted cash and escrows, end of year	15,386,000	6,034,000	8,755,000
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided By/(Used In) Operating Activities	(484,275,000)	(309,741,000)	0
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	0	0	0
Net sale proceeds from wholly-owned properties	0	0	0
Intercompany note receivable		(88,000,000)	48,610,000
Net sale proceeds received from unconsolidated joint ventures			0
Note receivable issuance		0
Note receivable payment		0
Investments in unconsolidated joint ventures			0
Deferred lease costs paid	0	0	0
Distributions from subsidiaries	89,631,000	(354,540,000)
Net cash provided by/(used in) investing activities	89,631,000	(442,540,000)	48,610,000
Cash Flows from Financing Activities:
Debt issuance costs paid	0	0	0
Proceeds from debt	0	0	0
Repayments of debt	0	0	0
Intercompany note payable		88,000,000	(48,610,000)
Costs of issuance of common stock	0	0	0
Value of shares withheld for payment of taxes related to employee stock compensation	0	0	0
Repurchases of common stock as part of announced plan	0	0	0
(Distributions to)/repayments from affiliates			0
Dividends paid and discount on dividend reinvestments	395,162,000	663,763,000	0
Net cash used in financing activities	395,162,000	751,763,000	(48,610,000)
Net increase/(decrease) in cash, cash equivalents, and restricted cash and escrows	518,000	(518,000)	0
Cash, cash equivalents, and restricted cash and escrows, beginning of year	(518,000)	0	0
Cash, cash equivalents, and restricted cash and escrows, end of year	0	(518,000)	0
Piedmont (Parent) (Guarantor) \| Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided By/(Used In) Operating Activities	236,214,000	135,755,000	5,497,000
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	0	0	0
Net sale proceeds from wholly-owned properties	0	0	0
Intercompany note receivable		0	0
Net sale proceeds received from unconsolidated joint ventures			0
Note receivable issuance		0
Note receivable payment		0
Investments in unconsolidated joint ventures			0
Deferred lease costs paid	0	0	0
Distributions from subsidiaries	(108,918,000)	349,135,000
Net cash provided by/(used in) investing activities	(108,918,000)	349,135,000	0
Cash Flows from Financing Activities:
Debt issuance costs paid	0	0	0
Proceeds from debt	0	0	0
Repayments of debt	0	0	0
Intercompany note payable		0	0
Costs of issuance of common stock	(710,000)	(85,000)	(182,000)
Value of shares withheld for payment of taxes related to employee stock compensation	(3,295,000)	(2,219,000)	(3,403,000)
Repurchases of common stock as part of announced plan	(16,899,000)	(298,538,000)	(60,474,000)
(Distributions to)/repayments from affiliates			180,791,000
Dividends paid and discount on dividend reinvestments	(106,392,000)	(184,048,000)	(122,229,000)
Net cash used in financing activities	(127,296,000)	(484,890,000)	(5,497,000)
Net increase/(decrease) in cash, cash equivalents, and restricted cash and escrows	0	0	0
Cash, cash equivalents, and restricted cash and escrows, beginning of year	150,000	150,000	150,000
Cash, cash equivalents, and restricted cash and escrows, end of year	150,000	150,000	150,000
Piedmont OP (the Issuer) \| Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided By/(Used In) Operating Activities	220,068,000	141,293,000	(18,989,000)
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	(16,020,000)	(14,479,000)	(1,614,000)
Net sale proceeds from wholly-owned properties	113,000	36,572,000	23,028,000
Intercompany note receivable		88,000,000	100,000
Net sale proceeds received from unconsolidated joint ventures			12,334,000
Note receivable issuance		0
Note receivable payment		0
Investments in unconsolidated joint ventures			(1,162,000)
Deferred lease costs paid	(3,220,000)	(3,090,000)	(4,081,000)
Distributions from subsidiaries	19,287,000	5,405,000
Net cash provided by/(used in) investing activities	160,000	112,408,000	28,605,000
Cash Flows from Financing Activities:
Debt issuance costs paid	(151,000)	(1,040,000)	(132,000)
Proceeds from debt	592,000,000	977,062,000	180,000,000
Repayments of debt	(797,000,000)	(1,019,000,000)	(335,000,000)
Intercompany note payable		0	(14,289,000)
Costs of issuance of common stock	0	0	0
Value of shares withheld for payment of taxes related to employee stock compensation	0	0	0
Repurchases of common stock as part of announced plan	0	0	0
(Distributions to)/repayments from affiliates			160,019,000
Dividends paid and discount on dividend reinvestments	(5,420,000)	(214,596,000)	0
Net cash used in financing activities	(210,571,000)	(257,574,000)	(9,402,000)
Net increase/(decrease) in cash, cash equivalents, and restricted cash and escrows	9,657,000	(3,873,000)	214,000
Cash, cash equivalents, and restricted cash and escrows, beginning of year	34,000	3,907,000	3,693,000
Cash, cash equivalents, and restricted cash and escrows, end of year	9,691,000	34,000	3,907,000
Non-Guarantor Subsidiaries \| Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided By/(Used In) Operating Activities	236,477,000	235,562,000	256,297,000
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	(413,733,000)	(209,540,000)	(113,479,000)
Net sale proceeds from wholly-owned properties	589,654,000	538,655,000	352,490,000
Intercompany note receivable		0	(48,710,000)
Net sale proceeds received from unconsolidated joint ventures			0
Note receivable issuance		(3,200,000)
Note receivable payment		3,200,000
Investments in unconsolidated joint ventures			0
Deferred lease costs paid	(22,419,000)	(24,340,000)	(26,904,000)
Distributions from subsidiaries	0	0
Net cash provided by/(used in) investing activities	153,502,000	304,775,000	163,397,000
Cash Flows from Financing Activities:
Debt issuance costs paid	0	0	0
Proceeds from debt	0	0	0
Repayments of debt	(1,019,000)	(1,455,000)	(141,401,000)
Intercompany note payable		(88,000,000)	62,899,000
Costs of issuance of common stock	0	0	0
Value of shares withheld for payment of taxes related to employee stock compensation	0	0	0
Repurchases of common stock as part of announced plan	0	0	0
(Distributions to)/repayments from affiliates			(340,810,000)
Dividends paid and discount on dividend reinvestments	(389,783,000)	(449,212,000)	(45,000)
Net cash used in financing activities	(390,802,000)	(538,667,000)	(419,357,000)
Net increase/(decrease) in cash, cash equivalents, and restricted cash and escrows	(823,000)	1,670,000	337,000
Cash, cash equivalents, and restricted cash and escrows, beginning of year	6,368,000	4,698,000	4,361,000
Cash, cash equivalents, and restricted cash and escrows, end of year	$ 5,545,000	$ 6,368,000	$ 4,698,000

Subsequent events (Details) $ / shares in Units, ft² in Millions				3 Months Ended								12 Months Ended
	Feb. 12, 2020 USD ($) ft² a property numberOfHotelRooms numberOfRestaurants $ / ft²	Feb. 10, 2020 USD ($)	Feb. 04, 2020 $ / shares	Dec. 31, 2019 USD ($) ft² a $ / shares	Sep. 30, 2019 $ / shares	Jun. 30, 2019 $ / shares	Mar. 31, 2019 $ / shares	Dec. 31, 2018 $ / shares	Sep. 30, 2018 $ / shares	Jun. 30, 2018 $ / shares	Mar. 31, 2018 $ / shares	Dec. 31, 2019 USD ($) ft² a
Subsequent Event [Line Items]
Dividends declared (in dollars per share) \| $ / shares				$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21
Rentable square feet \| ft²				16.0								16.0
Area of land \| a				11.7								11.7
Unsecured 500 Million 2018 Line Of Credit \| Unsecured Debt
Subsequent Event [Line Items]
Face amount of facility				$ 500,000,000								$ 500,000,000
Line of Credit \| Unsecured 500 Million 2018 Line Of Credit \| Unsecured Debt
Subsequent Event [Line Items]
Amount of line of credit				$ 500,000,000								$ 500,000,000
LIBOR \| Unsecured 500 Million 2018 Line Of Credit \| Unsecured Debt
Subsequent Event [Line Items]
Spread on variable rate												0.90%
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share) \| $ / shares			$ 0.21
Face amount of facility		$ 150,000,000
Subsequent Event \| Dallas Galleria Office Towers
Subsequent Event [Line Items]
Rentable square feet \| ft²	1.4
Number of office towers \| property	3
Area of land \| a	1.9
Area of mixed use development \| ft²	3.7
Dining establishments \| numberOfRestaurants	30
Area of retail space \| ft²	1.5
Number of hotel rooms \| numberOfHotelRooms	448
Asset contractual purchase price	$ 396,000,000
Price per square foot \| $ / ft²	275
Subsequent Event \| Line of Credit \| Unsecured 500 Million 2018 Line Of Credit \| Unsecured Debt
Subsequent Event [Line Items]
Amount of line of credit	$ 500,000,000
Subsequent Event \| LIBOR
Subsequent Event [Line Items]
Spread on variable rate		0.95%

Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Real Estate and Accumulated Depreciation [Line Items]
Gross Amount at Which Carried, Total	$ 3,924,531,000	$ 3,924,531,000	$ 4,800,025,000	$ 3,818,287,000	$ 3,924,531,000
Accumulated Depreciation and Amortization	875,777,000	1,053,467,000	1,058,704,000	875,777,000	907,937,000
Tax basis of total assets				3,300,000,000	$ 3,600,000,000
Real Estate:
Balance at the beginning of the year	3,924,531,000	4,438,209,000	4,800,025,000
Additions to/improvements of real estate	406,833,000	206,442,000	85,368,000
Assets disposed	(452,672,000)	(675,692,000)	(353,911,000)
Assets impaired	(8,953,000)	0	(46,461,000)
Write-offs of intangible assets	(36,429,000)	(33,067,000)	(37,188,000)
Write-offs of fully depreciated/amortized assets	(15,023,000)	(11,361,000)	(9,624,000)
Balance at the end of the year	3,818,287,000	3,924,531,000	4,438,209,000
Accumulated Depreciation and Amortization:
Balance at the beginning of the year	907,937,000	1,053,467,000	1,058,704,000
Depreciation and amortization expense	132,600,000	128,456,000	145,837,000
Assets disposed	(113,309,000)	(229,558,000)	(104,262,000)
Write-offs of intangible assets	(36,428,000)	(33,067,000)	(37,188,000)
Write-offs of fully depreciated/amortized assets	(15,023,000)	(11,361,000)	(9,624,000)
Balance at the end of the year	$ 875,777,000	$ 907,937,000	$ 1,053,467,000
Building
Real Estate and Accumulated Depreciation [Line Items]
Useful life	40 years
Wholly Owned Properties
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost, Land				474,206,000
Initial Cost, Buildings and Improvements				3,103,994,000
Initial Cost, Total				3,578,200,000
Costs Capitalized Subsequent to Acquisition				240,087,000
Gross Amount at Which Carried, Land				506,389,000
Gross Amount at Which Carried, Buildings and Improvements				3,311,898,000
Gross Amount at Which Carried, Total	$ 3,818,287,000			3,818,287,000
Accumulated Depreciation and Amortization	875,777,000			$ 875,777,000
Real Estate:
Balance at the end of the year	3,818,287,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 875,777,000
Minimum \| Building improvements
Real Estate and Accumulated Depreciation [Line Items]
Useful life	5 years
Minimum \| Land improvements
Real Estate and Accumulated Depreciation [Line Items]
Useful life	20 years
Maximum \| Building improvements
Real Estate and Accumulated Depreciation [Line Items]
Useful life	25 years
Maximum \| Land improvements
Real Estate and Accumulated Depreciation [Line Items]
Useful life	25 years
1430 ENCLAVE PARKWAY
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 7,100,000
Initial Cost, Buildings and Improvements				37,915,000
Initial Cost, Total				45,015,000
Costs Capitalized Subsequent to Acquisition				5,516,000
Gross Amount at Which Carried, Land				5,506,000
Gross Amount at Which Carried, Buildings and Improvements				45,025,000
Gross Amount at Which Carried, Total	$ 50,531,000			50,531,000
Accumulated Depreciation and Amortization	20,078,000			$ 20,078,000
Real Estate:
Balance at the end of the year	50,531,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 20,078,000
1430 ENCLAVE PARKWAY \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
1430 ENCLAVE PARKWAY \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
CRESCENT RIDGE II
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 7,700,000
Initial Cost, Buildings and Improvements				45,154,000
Initial Cost, Total				52,854,000
Costs Capitalized Subsequent to Acquisition				12,099,000
Gross Amount at Which Carried, Land				8,021,000
Gross Amount at Which Carried, Buildings and Improvements				56,932,000
Gross Amount at Which Carried, Total	$ 64,953,000			64,953,000
Accumulated Depreciation and Amortization	27,328,000			$ 27,328,000
Real Estate:
Balance at the end of the year	64,953,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 27,328,000
CRESCENT RIDGE II \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
CRESCENT RIDGE II \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
90 CENTRAL STREET
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 3,642,000
Initial Cost, Buildings and Improvements				29,497,000
Initial Cost, Total				33,139,000
Costs Capitalized Subsequent to Acquisition				2,059,000
Gross Amount at Which Carried, Land				3,642,000
Gross Amount at Which Carried, Buildings and Improvements				31,556,000
Gross Amount at Which Carried, Total	$ 35,198,000			35,198,000
Accumulated Depreciation and Amortization	13,992,000			$ 13,992,000
Real Estate:
Balance at the end of the year	35,198,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 13,992,000
90 CENTRAL STREET \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
90 CENTRAL STREET \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
6031 CONNECTION DRIVE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 3,157,000
Initial Cost, Buildings and Improvements				43,656,000
Initial Cost, Total				46,813,000
Costs Capitalized Subsequent to Acquisition				5,310,000
Gross Amount at Which Carried, Land				3,157,000
Gross Amount at Which Carried, Buildings and Improvements				48,966,000
Gross Amount at Which Carried, Total	$ 52,123,000			52,123,000
Accumulated Depreciation and Amortization	21,764,000			$ 21,764,000
Real Estate:
Balance at the end of the year	52,123,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 21,764,000
6031 CONNECTION DRIVE \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
6031 CONNECTION DRIVE \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
6021 CONNECTION DRIVE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 3,157,000
Initial Cost, Buildings and Improvements				42,662,000
Initial Cost, Total				45,819,000
Costs Capitalized Subsequent to Acquisition				11,194,000
Gross Amount at Which Carried, Land				3,157,000
Gross Amount at Which Carried, Buildings and Improvements				53,856,000
Gross Amount at Which Carried, Total	$ 57,013,000			57,013,000
Accumulated Depreciation and Amortization	23,940,000			$ 23,940,000
Real Estate:
Balance at the end of the year	57,013,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 23,940,000
6021 CONNECTION DRIVE \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
6021 CONNECTION DRIVE \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
6011 CONNECTION DRIVE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 3,157,000
Initial Cost, Buildings and Improvements				29,034,000
Initial Cost, Total				32,191,000
Costs Capitalized Subsequent to Acquisition				18,451,000
Gross Amount at Which Carried, Land				3,157,000
Gross Amount at Which Carried, Buildings and Improvements				47,485,000
Gross Amount at Which Carried, Total	$ 50,642,000			50,642,000
Accumulated Depreciation and Amortization	13,932,000			$ 13,932,000
Real Estate:
Balance at the end of the year	50,642,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 13,932,000
6011 CONNECTION DRIVE \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
6011 CONNECTION DRIVE \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
US BANCORP CENTER
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 11,138,000
Initial Cost, Buildings and Improvements				175,629,000
Initial Cost, Total				186,767,000
Costs Capitalized Subsequent to Acquisition				31,031,000
Gross Amount at Which Carried, Land				11,138,000
Gross Amount at Which Carried, Buildings and Improvements				206,660,000
Gross Amount at Which Carried, Total	$ 217,798,000			217,798,000
Accumulated Depreciation and Amortization	84,479,000			$ 84,479,000
Real Estate:
Balance at the end of the year	217,798,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 84,479,000
US BANCORP CENTER \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
US BANCORP CENTER \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
GLENRIDGE HIGHLANDS TWO
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 6,662,000
Initial Cost, Buildings and Improvements				69,031,000
Initial Cost, Total				75,693,000
Costs Capitalized Subsequent to Acquisition				(16,167,000)
Gross Amount at Which Carried, Land				6,662,000
Gross Amount at Which Carried, Buildings and Improvements				52,864,000
Gross Amount at Which Carried, Total	$ 59,526,000			59,526,000
Accumulated Depreciation and Amortization	25,404,000			$ 25,404,000
Real Estate:
Balance at the end of the year	59,526,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 25,404,000
GLENRIDGE HIGHLANDS TWO \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
GLENRIDGE HIGHLANDS TWO \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
200 BRIDGEWATER CROSSING
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 8,182,000
Initial Cost, Buildings and Improvements				84,160,000
Initial Cost, Total				92,342,000
Costs Capitalized Subsequent to Acquisition				(11,288,000)
Gross Amount at Which Carried, Land				8,328,000
Gross Amount at Which Carried, Buildings and Improvements				72,726,000
Gross Amount at Which Carried, Total	$ 81,054,000			81,054,000
Accumulated Depreciation and Amortization	30,985,000			$ 30,985,000
Real Estate:
Balance at the end of the year	81,054,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 30,985,000
200 BRIDGEWATER CROSSING \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
200 BRIDGEWATER CROSSING \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
400 VIRGINIA AVE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 22,146,000
Initial Cost, Buildings and Improvements				49,740,000
Initial Cost, Total				71,886,000
Costs Capitalized Subsequent to Acquisition				1,579,000
Gross Amount at Which Carried, Land				22,146,000
Gross Amount at Which Carried, Buildings and Improvements				51,319,000
Gross Amount at Which Carried, Total	$ 73,465,000			73,465,000
Accumulated Depreciation and Amortization	20,412,000			$ 20,412,000
Real Estate:
Balance at the end of the year	73,465,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 20,412,000
400 VIRGINIA AVE \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
400 VIRGINIA AVE \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
4250 NORTH FAIRFAX DRIVE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 13,636,000
Initial Cost, Buildings and Improvements				70,918,000
Initial Cost, Total				84,554,000
Costs Capitalized Subsequent to Acquisition				13,783,000
Gross Amount at Which Carried, Land				13,636,000
Gross Amount at Which Carried, Buildings and Improvements				84,701,000
Gross Amount at Which Carried, Total	$ 98,337,000			98,337,000
Accumulated Depreciation and Amortization	32,525,000			32,525,000
Real Estate:
Balance at the end of the year	98,337,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 32,525,000
4250 NORTH FAIRFAX DRIVE \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
4250 NORTH FAIRFAX DRIVE \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
1225 EYE STREET
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost, Land				21,959,000
Initial Cost, Buildings and Improvements				47,602,000
Initial Cost, Total				69,561,000
Costs Capitalized Subsequent to Acquisition				9,139,000
Gross Amount at Which Carried, Land				21,959,000
Gross Amount at Which Carried, Buildings and Improvements				56,741,000
Gross Amount at Which Carried, Total	$ 78,700,000			78,700,000
Accumulated Depreciation and Amortization	$ 23,701,000			23,701,000
Piedmont’s % Ownership of Entity	98.10%
Real Estate:
Balance at the end of the year	$ 78,700,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 23,701,000
1225 EYE STREET \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
1225 EYE STREET \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
1201 EYE STREET
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost, Land				31,985,000
Initial Cost, Buildings and Improvements				63,139,000
Initial Cost, Total				95,124,000
Costs Capitalized Subsequent to Acquisition				9,416,000
Gross Amount at Which Carried, Land				31,985,000
Gross Amount at Which Carried, Buildings and Improvements				72,555,000
Gross Amount at Which Carried, Total	$ 104,540,000			104,540,000
Accumulated Depreciation and Amortization	$ 26,779,000			$ 26,779,000
Piedmont’s % Ownership of Entity	98.60%
Real Estate:
Balance at the end of the year	$ 104,540,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 26,779,000
1201 EYE STREET \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
1201 EYE STREET \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
1901 MARKET STREET
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Encumbrances				$ 160,000
Initial Cost, Land				13,584,000
Initial Cost, Buildings and Improvements				166,683,000
Initial Cost, Total				180,267,000
Costs Capitalized Subsequent to Acquisition				53,684,000
Gross Amount at Which Carried, Land				20,829,000
Gross Amount at Which Carried, Buildings and Improvements				213,122,000
Gross Amount at Which Carried, Total	$ 233,951,000			233,951,000
Accumulated Depreciation and Amortization	94,261,000			$ 94,261,000
Real Estate:
Balance at the end of the year	233,951,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 94,261,000
1901 MARKET STREET \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
1901 MARKET STREET \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
60 BROAD STREET
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 32,522,000
Initial Cost, Buildings and Improvements				168,986,000
Initial Cost, Total				201,508,000
Costs Capitalized Subsequent to Acquisition				12,105,000
Gross Amount at Which Carried, Land				60,708,000
Gross Amount at Which Carried, Buildings and Improvements				152,905,000
Gross Amount at Which Carried, Total	$ 213,613,000			213,613,000
Accumulated Depreciation and Amortization	58,955,000			$ 58,955,000
Real Estate:
Balance at the end of the year	213,613,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 58,955,000
60 BROAD STREET \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
60 BROAD STREET \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
1414 MASSACHUSETTS AVENUE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 4,210,000
Initial Cost, Buildings and Improvements				35,821,000
Initial Cost, Total				40,031,000
Costs Capitalized Subsequent to Acquisition				(8,030,000)
Gross Amount at Which Carried, Land				4,365,000
Gross Amount at Which Carried, Buildings and Improvements				27,636,000
Gross Amount at Which Carried, Total	$ 32,001,000			32,001,000
Accumulated Depreciation and Amortization	11,120,000			$ 11,120,000
Real Estate:
Balance at the end of the year	32,001,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 11,120,000
1414 MASSACHUSETTS AVENUE \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
1414 MASSACHUSETTS AVENUE \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
ONE BRATTLE SQUARE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 6,974,000
Initial Cost, Buildings and Improvements				64,940,000
Initial Cost, Total				71,914,000
Costs Capitalized Subsequent to Acquisition				(23,111,000)
Gross Amount at Which Carried, Land				7,113,000
Gross Amount at Which Carried, Buildings and Improvements				41,690,000
Gross Amount at Which Carried, Total	$ 48,803,000			48,803,000
Accumulated Depreciation and Amortization	16,976,000			$ 16,976,000
Real Estate:
Balance at the end of the year	48,803,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 16,976,000
ONE BRATTLE SQUARE \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
ONE BRATTLE SQUARE \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
600 CORPORATE DRIVE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 3,934,000
Initial Cost, Buildings and Improvements				0
Initial Cost, Total				3,934,000
Costs Capitalized Subsequent to Acquisition				9,281,000
Gross Amount at Which Carried, Land				3,934,000
Gross Amount at Which Carried, Buildings and Improvements				9,281,000
Gross Amount at Which Carried, Total	$ 13,215,000			13,215,000
Accumulated Depreciation and Amortization	8,775,000			$ 8,775,000
Real Estate:
Balance at the end of the year	13,215,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 8,775,000
600 CORPORATE DRIVE \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
600 CORPORATE DRIVE \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
3100 CLARENDON BOULEVARD
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 11,700,000
Initial Cost, Buildings and Improvements				69,705,000
Initial Cost, Total				81,405,000
Costs Capitalized Subsequent to Acquisition				46,824,000
Gross Amount at Which Carried, Land				11,791,000
Gross Amount at Which Carried, Buildings and Improvements				116,438,000
Gross Amount at Which Carried, Total	$ 128,229,000			128,229,000
Accumulated Depreciation and Amortization	34,112,000			$ 34,112,000
Real Estate:
Balance at the end of the year	128,229,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 34,112,000
3100 CLARENDON BOULEVARD \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
3100 CLARENDON BOULEVARD \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
400 BRIDGEWATER CROSSING
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 10,400,000
Initial Cost, Buildings and Improvements				71,052,000
Initial Cost, Total				81,452,000
Costs Capitalized Subsequent to Acquisition				(14,328,000)
Gross Amount at Which Carried, Land				10,400,000
Gross Amount at Which Carried, Buildings and Improvements				56,724,000
Gross Amount at Which Carried, Total	$ 67,124,000			67,124,000
Accumulated Depreciation and Amortization	19,542,000			$ 19,542,000
Real Estate:
Balance at the end of the year	67,124,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 19,542,000
400 BRIDGEWATER CROSSING \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
400 BRIDGEWATER CROSSING \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
LAS COLINAS CORPORATE CENTER I
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 3,912,000
Initial Cost, Buildings and Improvements				18,830,000
Initial Cost, Total				22,742,000
Costs Capitalized Subsequent to Acquisition				(3,459,000)
Gross Amount at Which Carried, Land				2,543,000
Gross Amount at Which Carried, Buildings and Improvements				16,740,000
Gross Amount at Which Carried, Total	$ 19,283,000			19,283,000
Accumulated Depreciation and Amortization	6,961,000			$ 6,961,000
Real Estate:
Balance at the end of the year	19,283,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 6,961,000
LAS COLINAS CORPORATE CENTER I \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
LAS COLINAS CORPORATE CENTER I \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
LAS COLINAS CORPORATE CENTER II
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 4,496,000
Initial Cost, Buildings and Improvements				29,881,000
Initial Cost, Total				34,377,000
Costs Capitalized Subsequent to Acquisition				(3,484,000)
Gross Amount at Which Carried, Land				2,543,000
Gross Amount at Which Carried, Buildings and Improvements				28,350,000
Gross Amount at Which Carried, Total	$ 30,893,000			30,893,000
Accumulated Depreciation and Amortization	11,032,000			$ 11,032,000
Real Estate:
Balance at the end of the year	30,893,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 11,032,000
LAS COLINAS CORPORATE CENTER II \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
LAS COLINAS CORPORATE CENTER II \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
TWO PIERCE PLACE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 4,370,000
Initial Cost, Buildings and Improvements				70,632,000
Initial Cost, Total				75,002,000
Costs Capitalized Subsequent to Acquisition				13,155,000
Gross Amount at Which Carried, Land				8,156,000
Gross Amount at Which Carried, Buildings and Improvements				80,001,000
Gross Amount at Which Carried, Total	$ 88,157,000			88,157,000
Accumulated Depreciation and Amortization	23,285,000			$ 23,285,000
Real Estate:
Balance at the end of the year	88,157,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 23,285,000
TWO PIERCE PLACE \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
TWO PIERCE PLACE \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
ONE MERIDIAN CROSSINGS
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 2,919,000
Initial Cost, Buildings and Improvements				24,398,000
Initial Cost, Total				27,317,000
Costs Capitalized Subsequent to Acquisition				460,000
Gross Amount at Which Carried, Land				2,919,000
Gross Amount at Which Carried, Buildings and Improvements				24,858,000
Gross Amount at Which Carried, Total	$ 27,777,000			27,777,000
Accumulated Depreciation and Amortization	6,456,000			$ 6,456,000
Real Estate:
Balance at the end of the year	27,777,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 6,456,000
ONE MERIDIAN CROSSINGS \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
ONE MERIDIAN CROSSINGS \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
TWO MERIDIAN CROSSINGS
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 2,661,000
Initial Cost, Buildings and Improvements				25,742,000
Initial Cost, Total				28,403,000
Costs Capitalized Subsequent to Acquisition				766,000
Gross Amount at Which Carried, Land				2,661,000
Gross Amount at Which Carried, Buildings and Improvements				26,508,000
Gross Amount at Which Carried, Total	$ 29,169,000			29,169,000
Accumulated Depreciation and Amortization	6,964,000			$ 6,964,000
Real Estate:
Balance at the end of the year	29,169,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 6,964,000
TWO MERIDIAN CROSSINGS \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
TWO MERIDIAN CROSSINGS \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
THE MEDICI
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 1,780,000
Initial Cost, Buildings and Improvements				11,510,000
Initial Cost, Total				13,290,000
Costs Capitalized Subsequent to Acquisition				5,473,000
Gross Amount at Which Carried, Land				1,780,000
Gross Amount at Which Carried, Buildings and Improvements				16,983,000
Gross Amount at Which Carried, Total	$ 18,763,000			18,763,000
Accumulated Depreciation and Amortization	5,561,000			$ 5,561,000
Real Estate:
Balance at the end of the year	18,763,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 5,561,000
THE MEDICI \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
THE MEDICI \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
225 PRESIDENTIAL WAY
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 3,626,000
Initial Cost, Buildings and Improvements				36,916,000
Initial Cost, Total				40,542,000
Costs Capitalized Subsequent to Acquisition				(5,419,000)
Gross Amount at Which Carried, Land				3,612,000
Gross Amount at Which Carried, Buildings and Improvements				31,511,000
Gross Amount at Which Carried, Total	$ 35,123,000			35,123,000
Accumulated Depreciation and Amortization	6,479,000			$ 6,479,000
Real Estate:
Balance at the end of the year	35,123,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 6,479,000
225 PRESIDENTIAL WAY \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
225 PRESIDENTIAL WAY \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
235 PRESIDENTIAL WAY
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 4,154,000
Initial Cost, Buildings and Improvements				44,048,000
Initial Cost, Total				48,202,000
Costs Capitalized Subsequent to Acquisition				(6,851,000)
Gross Amount at Which Carried, Land				4,138,000
Gross Amount at Which Carried, Buildings and Improvements				37,213,000
Gross Amount at Which Carried, Total	$ 41,351,000			41,351,000
Accumulated Depreciation and Amortization	7,691,000			$ 7,691,000
Real Estate:
Balance at the end of the year	41,351,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 7,691,000
235 PRESIDENTIAL WAY \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
235 PRESIDENTIAL WAY \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
400 TOWNPARK
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 2,570,000
Initial Cost, Buildings and Improvements				20,555,000
Initial Cost, Total				23,125,000
Costs Capitalized Subsequent to Acquisition				5,487,000
Gross Amount at Which Carried, Land				2,570,000
Gross Amount at Which Carried, Buildings and Improvements				26,042,000
Gross Amount at Which Carried, Total	$ 28,612,000			28,612,000
Accumulated Depreciation and Amortization	6,900,000			$ 6,900,000
Real Estate:
Balance at the end of the year	28,612,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 6,900,000
400 TOWNPARK \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
400 TOWNPARK \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
ARLINGTON GATEWAY
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 36,930,000
Initial Cost, Buildings and Improvements				129,070,000
Initial Cost, Total				166,000,000
Costs Capitalized Subsequent to Acquisition				(525,000)
Gross Amount at Which Carried, Land				36,930,000
Gross Amount at Which Carried, Buildings and Improvements				128,545,000
Gross Amount at Which Carried, Total	$ 165,475,000			165,475,000
Accumulated Depreciation and Amortization	23,215,000			$ 23,215,000
Real Estate:
Balance at the end of the year	165,475,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 23,215,000
ARLINGTON GATEWAY \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
ARLINGTON GATEWAY \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
5 & 15 WAYSIDE ROAD
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 7,190,000
Initial Cost, Buildings and Improvements				55,445,000
Initial Cost, Total				62,635,000
Costs Capitalized Subsequent to Acquisition				7,432,000
Gross Amount at Which Carried, Land				7,190,000
Gross Amount at Which Carried, Buildings and Improvements				62,877,000
Gross Amount at Which Carried, Total	$ 70,067,000			70,067,000
Accumulated Depreciation and Amortization	12,914,000			$ 12,914,000
Real Estate:
Balance at the end of the year	70,067,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 12,914,000
5 & 15 WAYSIDE ROAD \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
5 & 15 WAYSIDE ROAD \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
6565 MACARTHUR BOULEVARD
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 4,820,000
Initial Cost, Buildings and Improvements				37,767,000
Initial Cost, Total				42,587,000
Costs Capitalized Subsequent to Acquisition				209,000
Gross Amount at Which Carried, Land				4,820,000
Gross Amount at Which Carried, Buildings and Improvements				37,976,000
Gross Amount at Which Carried, Total	$ 42,796,000			42,796,000
Accumulated Depreciation and Amortization	7,052,000			$ 7,052,000
Real Estate:
Balance at the end of the year	42,796,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 7,052,000
6565 MACARTHUR BOULEVARD \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
6565 MACARTHUR BOULEVARD \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
ONE LINCOLN PARK
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 6,640,000
Initial Cost, Buildings and Improvements				44,810,000
Initial Cost, Total				51,450,000
Costs Capitalized Subsequent to Acquisition				1,250,000
Gross Amount at Which Carried, Land				6,640,000
Gross Amount at Which Carried, Buildings and Improvements				46,060,000
Gross Amount at Which Carried, Total	$ 52,700,000			52,700,000
Accumulated Depreciation and Amortization	9,352,000			$ 9,352,000
Real Estate:
Balance at the end of the year	52,700,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 9,352,000
ONE LINCOLN PARK \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
ONE LINCOLN PARK \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
161 CORPORATE CENTER
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 2,020,000
Initial Cost, Buildings and Improvements				10,680,000
Initial Cost, Total				12,700,000
Costs Capitalized Subsequent to Acquisition				(239,000)
Gross Amount at Which Carried, Land				2,020,000
Gross Amount at Which Carried, Buildings and Improvements				10,441,000
Gross Amount at Which Carried, Total	$ 12,461,000			12,461,000
Accumulated Depreciation and Amortization	2,894,000			$ 2,894,000
Real Estate:
Balance at the end of the year	12,461,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 2,894,000
161 CORPORATE CENTER \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
161 CORPORATE CENTER \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
5 WALL STREET
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Encumbrances				$ 28,687
Initial Cost, Land				9,560,000
Initial Cost, Buildings and Improvements				50,276,000
Initial Cost, Total				59,836,000
Costs Capitalized Subsequent to Acquisition				(3,722,000)
Gross Amount at Which Carried, Land				9,560,000
Gross Amount at Which Carried, Buildings and Improvements				46,554,000
Gross Amount at Which Carried, Total	$ 56,114,000			56,114,000
Accumulated Depreciation and Amortization	7,357,000			$ 7,357,000
Real Estate:
Balance at the end of the year	56,114,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 7,357,000
5 WALL STREET \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
5 WALL STREET \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
1155 PERIMETER CENTER WEST
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 5,870,000
Initial Cost, Buildings and Improvements				66,849,000
Initial Cost, Total				72,719,000
Costs Capitalized Subsequent to Acquisition				(2,452,000)
Gross Amount at Which Carried, Land				5,870,000
Gross Amount at Which Carried, Buildings and Improvements				64,397,000
Gross Amount at Which Carried, Total	$ 70,267,000			70,267,000
Accumulated Depreciation and Amortization	10,589,000			$ 10,589,000
Real Estate:
Balance at the end of the year	70,267,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 10,589,000
1155 PERIMETER CENTER WEST \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
1155 PERIMETER CENTER WEST \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
500 TOWNPARK
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 2,147,000
Initial Cost, Buildings and Improvements				21,925,000
Initial Cost, Total				24,072,000
Costs Capitalized Subsequent to Acquisition				4,092,000
Gross Amount at Which Carried, Land				2,147,000
Gross Amount at Which Carried, Buildings and Improvements				26,017,000
Gross Amount at Which Carried, Total	$ 28,164,000			28,164,000
Accumulated Depreciation and Amortization	2,582,000			$ 2,582,000
Real Estate:
Balance at the end of the year	28,164,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 2,582,000
500 TOWNPARK \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
500 TOWNPARK \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
PARK PLACE ON TURTLE CREEK
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 4,470,000
Initial Cost, Buildings and Improvements				38,048,000
Initial Cost, Total				42,518,000
Costs Capitalized Subsequent to Acquisition				3,959,000
Gross Amount at Which Carried, Land				4,470,000
Gross Amount at Which Carried, Buildings and Improvements				42,007,000
Gross Amount at Which Carried, Total	$ 46,477,000			46,477,000
Accumulated Depreciation and Amortization	7,615,000			$ 7,615,000
Real Estate:
Balance at the end of the year	46,477,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 7,615,000
PARK PLACE ON TURTLE CREEK \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
PARK PLACE ON TURTLE CREEK \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
80 CENTRAL STREET
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 1,980,000
Initial Cost, Buildings and Improvements				8,930,000
Initial Cost, Total				10,910,000
Costs Capitalized Subsequent to Acquisition				3,021,000
Gross Amount at Which Carried, Land				1,980,000
Gross Amount at Which Carried, Buildings and Improvements				11,951,000
Gross Amount at Which Carried, Total	$ 13,931,000			13,931,000
Accumulated Depreciation and Amortization	1,250,000			$ 1,250,000
Real Estate:
Balance at the end of the year	13,931,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 1,250,000
80 CENTRAL STREET \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
80 CENTRAL STREET \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
ENCLAVE PLACE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 1,890,000
Initial Cost, Buildings and Improvements				60,094,000
Initial Cost, Total				61,984,000
Costs Capitalized Subsequent to Acquisition				35,631,000
Gross Amount at Which Carried, Land				1,890,000
Gross Amount at Which Carried, Buildings and Improvements				95,725,000
Gross Amount at Which Carried, Total	$ 97,615,000			97,615,000
Accumulated Depreciation and Amortization	7,078,000			$ 7,078,000
Real Estate:
Balance at the end of the year	97,615,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 7,078,000
ENCLAVE PLACE \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
ENCLAVE PLACE \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
SUNTRUST CENTER
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 11,660,000
Initial Cost, Buildings and Improvements				139,015,000
Initial Cost, Total				150,675,000
Costs Capitalized Subsequent to Acquisition				6,612,000
Gross Amount at Which Carried, Land				11,660,000
Gross Amount at Which Carried, Buildings and Improvements				145,627,000
Gross Amount at Which Carried, Total	$ 157,287,000			157,287,000
Accumulated Depreciation and Amortization	18,244,000			$ 18,244,000
Real Estate:
Balance at the end of the year	157,287,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 18,244,000
SUNTRUST CENTER \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
SUNTRUST CENTER \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
GALLERIA 300
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 4,000,000
Initial Cost, Buildings and Improvements				73,554,000
Initial Cost, Total				77,554,000
Costs Capitalized Subsequent to Acquisition				5,145,000
Gross Amount at Which Carried, Land				4,000,000
Gross Amount at Which Carried, Buildings and Improvements				78,699,000
Gross Amount at Which Carried, Total	$ 82,699,000			82,699,000
Accumulated Depreciation and Amortization	12,434,000			$ 12,434,000
Real Estate:
Balance at the end of the year	82,699,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 12,434,000
GALLERIA 300 \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
GALLERIA 300 \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
GLENRIDGE HIGHLANDS ONE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 5,960,000
Initial Cost, Buildings and Improvements				50,013,000
Initial Cost, Total				55,973,000
Costs Capitalized Subsequent to Acquisition				1,515,000
Gross Amount at Which Carried, Land				5,960,000
Gross Amount at Which Carried, Buildings and Improvements				51,528,000
Gross Amount at Which Carried, Total	$ 57,488,000			57,488,000
Accumulated Depreciation and Amortization	7,794,000			$ 7,794,000
Real Estate:
Balance at the end of the year	57,488,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 7,794,000
GLENRIDGE HIGHLANDS ONE \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
GLENRIDGE HIGHLANDS ONE \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
CNL CENTER I
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				99.00%
Initial Cost, Land				$ 6,470,000
Initial Cost, Buildings and Improvements				77,858,000
Initial Cost, Total				84,328,000
Costs Capitalized Subsequent to Acquisition				(2,089,000)
Gross Amount at Which Carried, Land				6,470,000
Gross Amount at Which Carried, Buildings and Improvements				75,769,000
Gross Amount at Which Carried, Total	$ 82,239,000			82,239,000
Accumulated Depreciation and Amortization	9,175,000			$ 9,175,000
Real Estate:
Balance at the end of the year	82,239,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 9,175,000
CNL CENTER I \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
CNL CENTER I \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
CNL CENTER II
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				99.00%
Initial Cost, Land				$ 4,550,000
Initial Cost, Buildings and Improvements				55,609,000
Initial Cost, Total				60,159,000
Costs Capitalized Subsequent to Acquisition				771,000
Gross Amount at Which Carried, Land				4,550,000
Gross Amount at Which Carried, Buildings and Improvements				56,380,000
Gross Amount at Which Carried, Total	$ 60,930,000			60,930,000
Accumulated Depreciation and Amortization	7,582,000			$ 7,582,000
Real Estate:
Balance at the end of the year	60,930,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 7,582,000
CNL CENTER II \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
CNL CENTER II \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
ONE WAYSIDE ROAD
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 6,240,000
Initial Cost, Buildings and Improvements				57,124,000
Initial Cost, Total				63,364,000
Costs Capitalized Subsequent to Acquisition				(4,471,000)
Gross Amount at Which Carried, Land				6,240,000
Gross Amount at Which Carried, Buildings and Improvements				52,653,000
Gross Amount at Which Carried, Total	$ 58,893,000			58,893,000
Accumulated Depreciation and Amortization	4,872,000			$ 4,872,000
Real Estate:
Balance at the end of the year	58,893,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 4,872,000
ONE WAYSIDE ROAD \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
ONE WAYSIDE ROAD \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
GALLERIA 200
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 6,470,000
Initial Cost, Buildings and Improvements				55,825,000
Initial Cost, Total				62,295,000
Costs Capitalized Subsequent to Acquisition				3,757,000
Gross Amount at Which Carried, Land				6,470,000
Gross Amount at Which Carried, Buildings and Improvements				59,582,000
Gross Amount at Which Carried, Total	$ 66,052,000			66,052,000
Accumulated Depreciation and Amortization	6,596,000			$ 6,596,000
Real Estate:
Balance at the end of the year	66,052,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 6,596,000
GALLERIA 200 \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
GALLERIA 200 \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
750 WEST JOHN CARPENTER FREEWAY
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 7,860,000
Initial Cost, Buildings and Improvements				36,303,000
Initial Cost, Total				44,163,000
Costs Capitalized Subsequent to Acquisition				2,034,000
Gross Amount at Which Carried, Land				7,860,000
Gross Amount at Which Carried, Buildings and Improvements				38,337,000
Gross Amount at Which Carried, Total	$ 46,197,000			46,197,000
Accumulated Depreciation and Amortization	6,284,000			$ 6,284,000
Real Estate:
Balance at the end of the year	46,197,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 6,284,000
750 WEST JOHN CARPENTER FREEWAY \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
750 WEST JOHN CARPENTER FREEWAY \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
NORMAN POINTE I
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 4,358,000
Initial Cost, Buildings and Improvements				22,322,000
Initial Cost, Total				26,680,000
Costs Capitalized Subsequent to Acquisition				1,191,000
Gross Amount at Which Carried, Land				4,360,000
Gross Amount at Which Carried, Buildings and Improvements				23,511,000
Gross Amount at Which Carried, Total	$ 27,871,000			27,871,000
Accumulated Depreciation and Amortization	2,064,000			$ 2,064,000
Real Estate:
Balance at the end of the year	27,871,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 2,064,000
NORMAN POINTE I \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
NORMAN POINTE I \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
501 West Church Street
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 2,805,000
Initial Cost, Buildings and Improvements				28,119,000
Initial Cost, Total				30,924,000
Costs Capitalized Subsequent to Acquisition				0
Gross Amount at Which Carried, Land				2,805,000
Gross Amount at Which Carried, Buildings and Improvements				28,119,000
Gross Amount at Which Carried, Total	$ 30,924,000			30,924,000
Accumulated Depreciation and Amortization	2,215,000			$ 2,215,000
Real Estate:
Balance at the end of the year	30,924,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 2,215,000
501 West Church Street \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
501 West Church Street \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
9320 Excelsior Boulevard
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 3,760,000
Initial Cost, Buildings and Improvements				35,289,000
Initial Cost, Total				39,049,000
Costs Capitalized Subsequent to Acquisition				(553,000)
Gross Amount at Which Carried, Land				3,707,000
Gross Amount at Which Carried, Buildings and Improvements				34,789,000
Gross Amount at Which Carried, Total	$ 38,496,000			38,496,000
Accumulated Depreciation and Amortization	2,469,000			$ 2,469,000
Real Estate:
Balance at the end of the year	38,496,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 2,469,000
9320 Excelsior Boulevard \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
9320 Excelsior Boulevard \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
25 Burlington Mall Road
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 10,230,000
Initial Cost, Buildings and Improvements				54,787,000
Initial Cost, Total				65,017,000
Costs Capitalized Subsequent to Acquisition				(1,002,000)
Gross Amount at Which Carried, Land				10,230,000
Gross Amount at Which Carried, Buildings and Improvements				53,785,000
Gross Amount at Which Carried, Total	$ 64,015,000			64,015,000
Accumulated Depreciation and Amortization	5,203,000			$ 5,203,000
Real Estate:
Balance at the end of the year	64,015,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 5,203,000
25 Burlington Mall Road \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
25 Burlington Mall Road \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
PIEDMONT POWER, LLC
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 0
Initial Cost, Buildings and Improvements				79,000
Initial Cost, Total				79,000
Costs Capitalized Subsequent to Acquisition				2,740,000
Gross Amount at Which Carried, Land				0
Gross Amount at Which Carried, Buildings and Improvements				2,819,000
Gross Amount at Which Carried, Total	$ 2,819,000			2,819,000
Accumulated Depreciation and Amortization	960,000			$ 960,000
Real Estate:
Balance at the end of the year	2,819,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 960,000
PIEDMONT POWER, LLC \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
PIEDMONT POWER, LLC \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
UNDEVELOPED LAND PARCELS
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 40,503,000
Initial Cost, Buildings and Improvements				0
Initial Cost, Total				40,503,000
Costs Capitalized Subsequent to Acquisition				(601,000)
Gross Amount at Which Carried, Land				37,614,000
Gross Amount at Which Carried, Buildings and Improvements				2,288,000
Gross Amount at Which Carried, Total	$ 39,902,000			39,902,000
Accumulated Depreciation and Amortization	206,000			$ 206,000
Real Estate:
Balance at the end of the year	39,902,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	206,000
Galleria 100
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 7,285,000
Initial Cost, Buildings and Improvements				72,449,000
Initial Cost, Total				79,734,000
Costs Capitalized Subsequent to Acquisition				946,000
Gross Amount at Which Carried, Land				7,285,000
Gross Amount at Which Carried, Buildings and Improvements				73,395,000
Gross Amount at Which Carried, Total	80,680,000			80,680,000
Accumulated Depreciation and Amortization	3,863,000			$ 3,863,000
Real Estate:
Balance at the end of the year	80,680,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 3,863,000
Galleria 100 \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
Galleria 100 \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
Galleria 400
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 5,687,000
Initial Cost, Buildings and Improvements				92,915,000
Initial Cost, Total				98,602,000
Costs Capitalized Subsequent to Acquisition				203,000
Gross Amount at Which Carried, Land				5,687,000
Gross Amount at Which Carried, Buildings and Improvements				93,118,000
Gross Amount at Which Carried, Total	$ 98,805,000			98,805,000
Accumulated Depreciation and Amortization	1,614,000			$ 1,614,000
Real Estate:
Balance at the end of the year	98,805,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 1,614,000
Galleria 400 \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
Galleria 400 \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
Galleria 600
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage				100.00%
Initial Cost, Land				$ 5,418,000
Initial Cost, Buildings and Improvements				81,003,000
Initial Cost, Total				86,421,000
Costs Capitalized Subsequent to Acquisition				558,000
Gross Amount at Which Carried, Land				5,418,000
Gross Amount at Which Carried, Buildings and Improvements				81,561,000
Gross Amount at Which Carried, Total	$ 86,979,000			86,979,000
Accumulated Depreciation and Amortization	1,915,000			$ 1,915,000
Real Estate:
Balance at the end of the year	86,979,000
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 1,915,000
Galleria 600 \| Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
Galleria 600 \| Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 0
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(94,000)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 94,000