Piedmont Office Realty Trust (PDM) 10-K 23 Feb 23 2022 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 22, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-34626
Entity Registrant Name	Piedmont Office Realty Trust, Inc.
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 1,600,619,445
Entity Common Stock, Shares Outstanding		123,642,953
Documents Incorporated by Reference	Registrant incorporates by reference portions of the Piedmont Office Realty Trust, Inc. Definitive Proxy Statement for the 2023 Annual Meeting of Stockholders (Items 10, 11, 12, 13, and 14 of Part III) to be filed no later than May 1, 2023.
Entity Central Index Key	0001042776
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022
Audit Information [Abstract]
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Atlanta, Georgia

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets:
Land	$ 567,244	$ 529,941
Buildings and improvements, less accumulated depreciation of $915,010 and $861,206 as of December 31, 2022 and December 31, 2021, respectively	2,766,990	2,513,697
Intangible lease assets, less accumulated amortization of $90,694 and $83,777 as of December 31, 2022 and December 31, 2021, respectively	114,380	94,380
Construction in progress	52,010	43,406
Real estate assets held for sale, net	0	63,887
Total real estate assets	3,500,624	3,245,311
Cash and cash equivalents	16,536	7,419
Tenant receivables, net of allowance for doubtful accounts of $1,000 and $4,000 as of December 31, 2022 and December 31, 2021, respectively	4,762	2,995
Straight-line rent receivables	172,019	162,632
Notes receivable	0	118,500
Restricted cash and escrows	3,064	1,441
Prepaid expenses and other assets	17,152	20,485
Goodwill	82,937	98,918
Gross derivative assets	4,183	0
Deferred lease costs, less accumulated amortization of $221,731 and $205,100 as of December 31, 2022 and December 31, 2021, respectively	284,248	264,571
Other assets held for sale, net	0	8,393
Total assets	4,085,525	3,930,665
Liabilities:
Unsecured debt, net of discount and unamortized debt issuance costs of $13,319 and $12,210 as of December 31, 2022 and December 31, 2021, respectively	1,786,681	1,877,790
Secured debt	197,000	0
Accounts payable, accrued expenses, and accrued capital expenditures	110,306	114,453
Dividends payable	25,357	26,048
Deferred income	59,977	80,686
Intangible lease liabilities, less accumulated amortization of $36,423 and $35,880 as of December 31, 2022 and December 31, 2021, respectively	56,949	39,341
Interest rate swaps	0	4,924
Total liabilities	2,236,270	2,143,242
Commitments and Contingencies (Note 8)	0	0
Stockholders’ Equity:
Shares-in-trust, 150,000,000 shares authorized, none outstanding as of December 31, 2022 or December 31, 2021	0	0
Preferred stock, no par value, 100,000,000 shares authorized, none outstanding as of December 31, 2022 or December 31, 2021	0	0
Common stock, $0.01 par value; 750,000,000 shares authorized, 123,439,558 shares issued and outstanding as of December 31, 2022; and 123,076,695 shares issued and outstanding at December 31, 2021	1,234	1,231
Additional paid-in capital	3,711,005	3,701,798
Cumulative distributions in excess of earnings	(1,855,893)	(1,899,081)
Accumulated other comprehensive loss	(8,679)	(18,154)
Piedmont stockholders’ equity	1,847,667	1,785,794
Noncontrolling interest	1,588	1,629
Total stockholders’ equity	1,849,255	1,787,423
Total liabilities and stockholders’ equity	$ 4,085,525	$ 3,930,665

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets:
Intangible lease assets, accumulated amortization	$ 90,694	$ 83,777
Tenant receivables, allowance for doubtful accounts	1,000	4,000
Deferred lease costs, accumulated amortization	221,731	205,100
Liabilities:
Intangible lease liabilities, accumulated amortization	$ 36,423	$ 35,880
Stockholders’ Equity:
Shares-in-trust, shares authorized (in shares)	150,000,000	150,000,000
Shares-in-trust, shares outstanding (in shares)	0	0
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	123,439,558	123,076,695
Common stock, shares outstanding (in shares)	123,439,558	123,076,695
Unsecured Debt
Liabilities:
Discount (premium) and unamortized debt issuance costs	$ 13,319	$ 12,210
Building and building improvements
Assets:
Buildings and improvements, accumulated depreciation	$ 915,010	$ 861,206

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Rental and tenant reimbursement revenue	$ 545,741	$ 514,619	$ 519,953
Total revenues	563,766	528,710	535,024
Expenses:
Property operating costs	226,058	210,932	214,933
Depreciation	133,616	120,615	110,575
Amortization	90,937	85,992	93,294
Impairment losses	25,981	41,000	0
General and administrative	29,127	30,252	27,464
Total expenses	505,719	488,791	446,266
Other income (expense):
Interest expense	(65,656)	(51,292)	(54,990)
Other income	2,710	10,206	2,587
Loss on extinguishment of debt	0	0	(9,336)
Gain on sale of real estate assets	151,729	0	205,666
Total other income (expense)	88,783	(41,086)	143,927
Net income/(loss)	146,830	(1,167)	232,685
Net loss applicable to noncontrolling interest	0	14	3
Net income/(loss) applicable to Piedmont	$ 146,830	$ (1,153)	$ 232,688
Per share information— basic and diluted:
Basic earnings per share (in dollars per share)	$ 1.19	$ (0.01)	$ 1.85
Diluted earnings per share (in dollars per share)	$ 1.19	$ (0.01)	$ 1.85
Weighted-average shares outstanding - basic (in shares)	123,351,187	123,977,616	125,730,460
Weighted-average shares outstanding - diluted (in shares)	123,523,881	123,977,616	126,104,321
Property management fee revenue
Revenues:
Property related revenue	$ 1,675	$ 2,496	$ 2,867
Other property related income
Revenues:
Property related revenue	$ 16,350	$ 11,595	$ 12,204

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income/(loss) applicable to Piedmont	$ 146,830	$ (1,153)	$ 232,688
Other comprehensive income/(loss):
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 5)	8,202	2,994	(26,794)
Plus: Reclassification of net loss included in net income (See Note 5)	1,273	2,952	1,727
Other comprehensive income/(loss)	9,475	5,946	(25,067)
Comprehensive income applicable to Piedmont	$ 156,305	$ 4,793	$ 207,621

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Cumulative Distributions in Excess of Earnings	Accumulated Other Comprehensive Income/(Loss)	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2019		125,783,000
Beginning 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]
Stock repurchases as part of an announced plan (in shares)		(2,190,000)
Share repurchases as part of announced plan	(30,671)	$ (22)		(30,649)
Dividends to common stockholders, stockholders of subsidiaries, and dividends reinvested	(105,565)		(5)	(105,520)		(40)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		246,000
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	7,605	$ 2	7,603
Net loss applicable to noncontrolling interests	(3)					(3)
Net income/(loss) applicable to Piedmont	232,688			232,688
Other comprehensive (loss) income	(25,067)				(25,067)
Ending balance, (in shares) at Dec. 31, 2020		123,839,000
Ending balance, value at Dec. 31, 2020	1,897,961	$ 1,238	3,693,996	(1,774,856)	(24,100)	1,683
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchases as part of an announced plan (in shares)		(1,060,000)
Share repurchases as part of announced plan	(18,852)	$ (10)		(18,842)
Offering costs	(55)		(55)
Dividends to common stockholders, stockholders of subsidiaries, and dividends reinvested	(104,270)			(104,230)		(40)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		298,000
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	7,860	$ 3	7,857
Net loss applicable to noncontrolling interests	(14)					(14)
Net income/(loss) applicable to Piedmont	(1,153)			(1,153)
Other comprehensive (loss) income	$ 5,946				5,946
Ending balance, (in shares) at Dec. 31, 2021	123,076,695	123,077,000
Ending balance, value at Dec. 31, 2021	$ 1,787,423	$ 1,231	3,701,798	(1,899,081)	(18,154)	1,629
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Offering costs	(460)		(460)
Dividends to common stockholders, stockholders of subsidiaries, and dividends reinvested	(103,683)			(103,642)		(41)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		363,000
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	9,670	$ 3	9,667
Net loss applicable to noncontrolling interests	0
Net income/(loss) applicable to Piedmont	146,830			146,830
Other comprehensive (loss) income	$ 9,475				9,475
Ending balance, (in shares) at Dec. 31, 2022	123,439,558	123,440,000
Ending balance, value at Dec. 31, 2022	$ 1,849,255	$ 1,234	$ 3,711,005	$ (1,855,893)	$ (8,679)	$ 1,588

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends to common stockholders (in dollars per share)	$ 0.84	$ 0.84	$ 0.84

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities:
Net income/(loss)	$ 146,830	$ (1,167)	$ 232,685
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation	133,616	120,615	110,575
Amortization of debt issuance costs inclusive of settled interest rate swaps	3,757	3,270	2,080
Other amortization	81,777	78,657	84,534
Impairment losses	25,981	41,000	0
Loss on extinguishment of debt	0	0	349
General reserve/(reversal) for uncollectible accounts	(3,000)	(553)	4,553
Stock compensation expense	8,968	10,984	9,718
Gain on sale of real estate assets	(151,729)	0	(205,666)
Changes in other operating assets and liabilities:
Increase in tenant and straight-line rent receivables	(14,163)	(9,691)	(30,887)
Decrease in prepaid expenses and other assets	4,774	1,294	823
Cash received/(paid) upon settlement of interest rate swaps	0	623	(19,930)
Increase/(decrease) in accounts payable and accrued expenses	(1,590)	1,861	6,264
Decrease in deferred income	(20,006)	(4,690)	(1,814)
Net cash provided by operating activities	215,215	242,203	193,284
Cash Flows from Investing Activities:
Acquisition of real estate assets, intangibles, and undeveloped land parcels	(270,908)	(226,011)	(417,056)
Capitalized expenditures	(121,359)	(122,626)	(112,580)
Net Sales Proceeds	297,388	0	360,094
Note receivable repayment	118,500	0	0
Deferred lease costs paid	(24,868)	(20,295)	(28,334)
Net cash used in investing activities	(1,247)	(368,932)	(197,876)
Cash Flows from Financing Activities:
Debt issuance and other costs paid	(374)	(1,038)	(1,363)
Proceeds from debt	803,420	789,580	1,174,383
Repayments of debt	(897,000)	(535,610)	(1,035,077)
Discount paid due to loan modification	(500)	0	(525)
Costs of issuance of common stock	(460)	(55)	0
Value of shares withheld for payment of taxes related to employee stock compensation	(3,940)	(3,060)	(2,703)
Repurchases of common stock as part of announced plan	0	(19,537)	(29,986)
Dividends paid and discount on dividend reinvestments	(104,374)	(103,905)	(106,309)
Net cash (used in)/provided by financing activities	(203,228)	126,375	(1,580)
Net increase/(decrease) in cash, cash equivalents, and restricted cash and escrows	10,740	(354)	(6,172)
Cash, cash equivalents, and restricted cash and escrows, beginning of year	8,860	9,214	15,386
Cash, cash equivalents, and restricted cash and escrows, end of year	$ 19,600	$ 8,860	$ 9,214

Organization

Organization	12 Months Ended
	Dec. 31, 2022
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 ownership, management, development, redevelopment, and operation of high-quality, Class A office properties located primarily in major U.S. Sunbelt markets. Piedmont was incorporated in 1997 and commenced operations in 1998. Piedmont conducts business through its wholly-owned subsidiary, Piedmont Operating Partnership, L.P. (“Piedmont OP”), a Delaware limited partnership. 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, 2022, Piedmont owned 51 in-service office properties and one redevelopment asset, primarily located in major U.S. Sunbelt office markets. As of December 31, 2022, the in-service office properties comprised approximately 16.7 million square feet (unaudited) and were 86.7% leased.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	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, own the 1201 and 1225 Eye Street buildings, respectively, in Washington, D.C. The other joint venture, Piedmont-CNL Towers Orlando, LLC, owns CNL Center I and II, in Orlando, Florida. All three joint venture investments are 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. Further, 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. The most significant of these estimates includes the underlying cash flows and holding periods used in assessing impairment, judgements regarding the recoverability of goodwill including the assumptions associated with the capitalization rates and discount rates used in valuing the properties in each reporting unit, and the assessment of the collectibility of receivables. While Piedmont has made, what it believes to be, appropriate accounting estimates based on the facts and circumstances available as of the reporting date, actual results could materially 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 and other costs such as taxes and insurance 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 operating properties 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 a direct cost associated with obtaining a tenant includes commissions, tenant improvements, and other direct costs and is 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 as of December 31, 2022 and 2021, respectively, are as follows (in thousands): December 31, 2022 December 31, 2021 Intangible Lease Assets: Above-Market In-Place Lease Assets $ 1,147 $ 1,882 In-Place Lease Valuation $ 203,927 $ 176,275 Intangible Lease Origination Costs (included as component of Deferred Lease Costs) $ 285,777 $ 266,575 Intangible Lease Liabilities (Below-Market In-Place Leases) $ 93,372 $ 75,221 For the years ended December 31, 2022, 2021, and 2020, respectively, Piedmont recognized amortization of intangible lease costs in the accompanying consolidated statements of operations, as follows (in thousands): 2022 2021 2020 Amortization of Intangible Lease Origination Costs and In-Place Lease Valuation included in Amortization $ 74,167 $ 69,388 $ 77,000 Amortization of Above-Market and Below-Market In-Place Lease Intangibles as a net increase to Rental and Tenant Reimbursement Revenue $ 13,426 $ 11,180 $ 12,191 Net intangible assets and liabilities as of December 31, 2022 will be amortized as follows (in thousands): Intangible Lease Assets Above-Market In-Place Lease Valuation Intangible Lease Origination Costs (1) Below-Market For the year ending December 31: 2023 $ 143 $ 29,520 $ 34,495 $ 12,581 2024 109 22,076 26,892 10,071 2025 31 16,680 21,541 8,440 2026 14 13,146 18,227 6,904 2027 13 10,426 15,010 5,814 Thereafter 30 22,192 33,220 13,139 $ 340 $ 114,040 $ 149,385 $ 56,949 Weighted-Average Amortization Period (in years) 4 6 6 6 (1) Included as a component of Deferred Lease Costs in the accompanying consolidated balance sheets. 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 associated with 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. Piedmont evaluates the collectibility of its operating lease receivables on a tenant/lease-specific basis and recognizes changes in the collectibility assessment of its operating lease receivables as a reduction of rental and tenant reimbursement revenues. Allowance for Doubtful Accounts As detailed above, Piedmont records contra-revenue adjustments for tenant/lease-specific changes in the collectibility assessments of its operating lease receivables as a reduction of rental and tenant reimbursement revenues. These charges reduce tenant and straight-line rent receivable to net realizable value upon recognition. In addition, during the year ended December 31, 2020, Piedmont also established an allowance for doubtful accounts for amounts that may become uncollectible in the future. Details of Piedmont's allowance for doubtful accounts for the years ended December 31, 2022, 2021, and 2020 are as follows: Balance at Beginning of Period Additions/Reversals as Decrease/(Increase) to Revenue Write-offs Balance at End of Period Year Ended December 31, 2022 $ 4,000 $ (3,000) $ — $ 1,000 2021 $ 4,553 $ 35 $ (588) $ 4,000 2020 $ — $ 8,734 $ (4,181) $ 4,553 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, and is allocated to each of Piedmont's reporting units. (See Note 16 below for further detail). Piedmont tests the carrying value of the goodwill assigned to each of its reporting units for impairment on an annual basis, or on an interim basis if an event occurs or circumstances change that would indicate it is more likely than not that the fair value of a reporting unit may be less than its carrying value. 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 the carrying value of the entity. In performing its goodwill impairment assessment, Piedmont compares the estimated fair value of each of its reporting units to the reporting unit’s carrying value. If Piedmont concludes that the fair value of a reporting unit is less than its carrying value, then Piedmont would recognize a goodwill impairment loss equal to 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). Estimation of the fair value of each reporting unit involves projections of discounted future cash flows, which are derived using certain assumptions that are subjective in nature. Piedmont also makes assumptions about future market rental income amounts subsequent to the expiration of current lease agreements, property operating expenses, and the number of months it takes to re-lease the property, among other factors. Piedmont determined that its goodwill was impaired during the year ended December 31, 2022, and recorded a goodwill impairment loss equal to the excess of its Washington, D.C/Northern Virginia reporting unit’s carrying amount over its estimated fair value, or approximately $16.0 million, in the accompanying consolidated statement of operations. The fair value measurements used in the evaluation described above are considered to be Level 3 valuations within the fair value hierarchy as defined by GAAP as they involve projections of discounted future cash flows, which are derived from unobservable assumptions, the most subjective of which are capitalization rates and discount rates for each respective reporting unit. Interest Rate Derivatives Piedmont periodically enters into interest rate derivative agreements to hedge its exposure to changing interest rates. As of December 31, 2022 and 2021, 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 operations 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. Additionally, in conjunction with entering into various interest rate swap agreements during the year ended December 31, 2022 which are based upon the Secured Overnight Financing Rate ("SOFR") while the underlying debt is currently based upon LIBOR, Piedmont made an accounting policy election in accordance with Accounting Standards Codification ("ASC") Topic 848 Reference Rate Reform to assert that the hedged forecasted transactions remain probable of occurring and that the LIBOR reference rate is expected to be replaced by SOFR. 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. Deferred lease costs are amortized on a straight-line basis over the terms of the related underlying leases in the accompanying consolidated statements of operations as follows: • Approximately $57.9 million, $56.4 million, and $60.2 million of deferred lease costs are included in amortization expense for the years ended December 31, 2022, 2021, and 2020, respectively; and • Approximately $4.2 million, $3.9 million, and $3.4 million, of deferred lease costs related to lease incentives granted to tenants are included as an offset to rental and tenant reimbursement revenue for the years ended December 31, 2022, 2021, and 2020, respectively. Upon receipt of an early lease termination notice, Piedmont recognizes any unamortized deferred lease costs 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. 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, $0.3 million, and $0.5 million for the years ended December 31, 2022, 2021, and 2020, 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 $0.6 million, $0.5 million and $0.3 million for the years ended December 31, 2022, 2021, and 2020, 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, 2022, 2021, and 2020 of approximately $2.8 million, $2.7 million, and $3.0 million, respectively. Deferred income Deferred income is primarily comprised of the following items: • prepaid rent from tenants; • tenant reimbursements related to operating expense or property tax expenses which may be due to tenants as part of an annual operating expense reconciliation; and • tenant improvement allowance overages or improvements funded by the tenant where Piedmont owns the underlying improvements. Deferred income related to prepaid rents from tenants will be recognized as rental 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 or improvements paid for 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. Under its board-authorized stock repurchase program, 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, 2022, Piedmont had approximately $150.5 million of remaining capacity under the program which may be used for share repurchases through February 2024. 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”). Piedmont previously 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. During the year ended December 31, 2020, the board of directors terminated the company-funded DRP offered through its transfer agent. 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 operations. 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 tenants for tenant improvements owned by Piedmont are treated as deferred income 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 and 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 is satisfied over the length of the contract, not at any specific point in time, and has 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 (t

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisitions During the year ended December 31, 2022, Piedmont acquired 100% of the ownership interest in 1180 Peachtree Street in Midtown Atlanta, Georgia (part of the Atlanta geographic segment), consisting of 691,092 square feet and 95% leased. The net contractual purchase price of $465.7 million included the assumption of an existing $197 million, 4.10% mortgage secured by the property. The remaining cash portion of the purchase price was primarily funded using the $200 Million Unsecured 2022 Term Loan Facility (further described in Note 4 below), as well as cash on hand and our $600 Million Unsecured 2022 Line of Credit. The purchase price of 1180 Peachtree Street, inclusive of approximately $2.2 million of closing costs, was allocated as follows: 1180 Peachtree Street Land $ 56,932 Building and improvements 336,228 Intangible lease assets (1) 53,426 Lease acquisition costs, net of tenant credits received from seller (1) (4,071) Intangible lease origination costs (1) 56,748 Intangible lease liabilities (1) (31,355) Total allocated purchase price $ 467,908 Assumption of secured mortgage note (197,000) Net cash paid upon acquisition $ 270,908 (1) Amortization of in-place lease intangibles and lease acquisition costs are recognized using the straight-line method over approximately 7.4 years, the average remaining life of in-place leases.

Debt

Debt	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Debt	Debt As noted above, in conjunction with the acquisition of 1180 Peachtree Street during the year ended December 31, 2022, Piedmont entered into a Loan Assignment and Assumption Agreement for an existing $197 million fixed rate mortgage secured by the property (the “$197 Million Fixed Rate Mortgage”). The $197 Million Fixed Rate Mortgage has a remaining term of approximately six years and a final maturity date of October 1, 2028. Interest only at a fixed rate of 4.10% per annum is payable until October 1, 2023, at which point the loan becomes amortizing. During the year ended December 31, 2022, Piedmont also entered into a new $200 million, floating-rate, unsecured term loan facility (the “$200 Million Unsecured 2022 Term Loan Facility”). The $200 Million Unsecured 2022 Term Loan Facility has a maturity date of December 16, 2024, and Piedmont may extend the term for six months through an available extension provided Piedmont is not then in default and all representations and warranties are true and correct in all material respects and upon payment of applicable extension fees. Piedmont may prepay the loan in whole or in part, at any time without premium or penalty. The stated interest rate spread over Adjusted SOFR can vary from 0.80% to 1.65% based upon the then current credit rating of Piedmont. As of December 31, 2022, the applicable interest rate spread on the loan was 1.00%. During the year ended December 31, 2022, Piedmont amended and restated its $500 Million Unsecured 2018 Line of Credit which had an initial maturity date of September 30, 2022. As amended and restated, the capacity of the line of credit has been expanded to $600 million (the "$600 Million Unsecured 2022 Line of Credit"). The term of the new $600 Million Unsecured 2022 Line of Credit was extended to June 30, 2026, and Piedmont may extend the term for up to one The $600 Million Unsecured 2022 Line of Credit has the option to bear interest at varying levels (determined with reference to the greater of the credit rating for Piedmont or Piedmont OP) based on the Adjusted SOFR Rate, Adjusted Daily Effective SOFR Rate, or the Base Rate, all as defined in the facility agreement. Further, the Base Rate is defined as the greater of the prime rate, the federal funds rate plus 0.5%, or the Adjusted SOFR Rate for a one-month period plus 1.0%. The term SOFR loans are available with interest periods selected by Piedmont of one three The following table summarizes the terms of Piedmont’s indebtedness outstanding as of December 31, 2022 and 2021, including net discounts/premiums and unamortized debt issuance costs (in thousands): Facility (1) Stated Rate Effective Rate (2) Maturity Amount Outstanding as of 2022 2021 Secured (Fixed) $197 Million Fixed Rate Mortgage 4.10 % 10/1/2028 $ 197,000 $ — 197,000 — Unsecured (Variable and Fixed) $350 Million Unsecured Senior Notes due 2023 3.40 % 3.43 % 6/01/2023 (3) 350,000 350,000 $200 Million Unsecured 2022 Term Loan Facility SOFR + 1.00% 5.42 % (4) 12/16/2024 (5) 200,000 — $400 Million Unsecured Senior Notes due 2024 4.45 % 4.10 % 3/15/2024 400,000 400,000 $250 Million Unsecured 2018 Term Loan LIBOR + 0.95% 4.54 % 3/31/2025 250,000 250,000 $600 Million Unsecured 2022 Line of Credit (6) SOFR + 0.85% — % (4) 6/30/2026 (7) — 290,000 $300 Million Unsecured Senior Notes due 2030 3.15 % 3.90 % 8/15/2030 300,000 300,000 $300 Million Unsecured Senior Notes due 2032 2.75 % 2.78 % 4/1/2032 300,000 300,000 Discounts and unamortized debt issuance costs (13,319) (12,210) Subtotal/Weighted Average (8) 3.87 % 1,786,681 1,877,790 Total/Weighted Average (8) 3.89 % $ 1,983,681 $ 1,877,790 (1) All of Piedmont’s outstanding debt as of December 31, 2022 is interest-only until maturity, except for the $197 Million Fixed Rate Mortgage, secured by 1180 Peachtree Street, which will begin amortizing principal in October 2023. (2) Effective rate after consideration of settled or in-place interest rate swap agreements and issuance discounts. (3) Piedmont currently intends to repay the $350 Million Unsecured Senior Notes due 2023 using proceeds from a new $215 million term loan (see Note 17 ), and a combination of cash on hand, proceeds from select property dispositions, and borrowings under our $600 Million Unsecured 2022 Line of Credit. (4) On a periodic basis, Piedmont may select from multiple interest rate options, including the prime rate and various-length SOFR locks on all or a portion of the principal. All SOFR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating. (5) Piedmont may extend the term for six additional months to a final extended maturity date of June 18, 2025, provided Piedmont is not then in default and all representations and warranties are true and correct in all material respects and upon payment of extension fees. (6) The $500 Million Unsecured 2018 Line of Credit was amended and restated during the year ended December 31, 2022 and is now reflected as the $600 Million Unsecured 2022 Line of Credit. The $500 Million Unsecured 2018 Line of Credit had a stated rate of LIBOR + 0.90% as of December 31, 2021. (7) Piedmont may extend the term for up to one (8) Weighted average is based on contractual balance of outstanding debt and the stated or effectively fixed interest rates as of December 31, 2022. A summary of Piedmont's consolidated principal outstanding for aggregate debt maturities of its indebtedness as of December 31, 2022, is provided below (in thousands): 2023 $ 350,000 2024 600,000 2025 250,000 2026 — 2027 — Thereafter 797,000 Total $ 1,997,000 Piedmont’s weighted-average interest rate as of December 31, 2022 and 2021, for the aforementioned borrowings was approximately 3.89% and 2.93%, respectively. Piedmont made interest payments on all indebtedness, including interest rate swap cash settlements, of approximately $66.1 million, $49.4 million, and $50.7 million during the years ended December 31, 2022, 2021, and 2020, respectively. Also, Piedmont capitalized interest of approximately $4.2 million, $3.7 million, and $1.0 million for the years ended December 31, 2022, 2021, and 2020, respectively. As of December 31, 2022, 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, 2022.

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	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. As of December 31, 2022, Piedmont was party to a total of eight interest rate swap agreements which are designated as effective cash flow hedges and fully hedge the variable cash flows covering the entire outstanding balance of the $250 Million Unsecured 2018 Term Loan through the maturity of the loan in March 2025. The maximum length of time over which Piedmont is hedging its exposure to the variability in future cash flows related to these interest rate swap agreements is 27 months. Of the eight swaps outstanding as of December 31, 2022, six swaps, each with a notional value of $25 million, were entered into during the year ended December 31, 2022. During the year ended December 31, 2021, Piedmont entered into, and subsequently settled, one forward starting interest rate swap agreement with a notional value of $50 million to hedge the risk of changes in the interest-related cash flows associated with the issuance of the $300 Million Unsecured Senior Notes due 2032 (see Note 4 ). The settlement resulted in a gain of approximately $0.6 million, which was recorded as accumulated OCI and is being amortized as an offset to interest expense over the following ten years. During the year ended December 31, 2020, Piedmont entered into and subsequently settled four forward starting interest rate swap agreements with a total notional value of $200 million to hedge the risk of changes in the interest-related cash flows associated with the issuance of the $300 Million Unsecured Senior Notes due 2030 (see Note 4 ). The settlement resulted in a loss of approximately $19.9 million, which was recorded as accumulated OCI and is being amortized as additional interest expense over the ten-year term of the $300 Million Unsecured Senior Notes due 2030. A detail of Piedmont’s interest rate derivatives outstanding as of December 31, 2022 is as follows: Interest Rate Derivatives: Number of Swap Agreements Associated Debt Instrument Notional Amount Effective Date Maturity Date Interest rate swaps 2 $250 Million Unsecured 2018 Term Loan $ 100 3/29/2018 3/31/2025 Interest rate swaps 3 $250 Million Unsecured 2018 Term Loan 75 12/2/2022 3/31/2025 Interest rate swaps 3 $250 Million Unsecured 2018 Term Loan 75 12/12/2022 3/31/2025 Total $ 250 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, 2022 and 2021, respectively, is as follows (in thousands): Interest rate swaps classified as: December 31, 2022 December 31, 2021 Gross derivative assets $ 4,183 $ — Gross derivative liabilities — (4,924) Net derivative liability $ 4,183 $ (4,924) The gain/(loss) on Piedmont's interest rate derivatives, including previously settled forward starting interest rate swaps, that was recorded in OCI and the accompanying consolidated statements of operations as a component of interest expense for the years ended December 31, 2022, 2021, and 2020, respectively, was as follows (in thousands): Interest Rate Swaps in Cash Flow Hedging Relationships: 2022 2021 2020 Amount of gain/(loss) recognized in OCI $ 8,202 $ 2,994 $ (26,794) Amount of previously recorded gain/(loss) reclassified from OCI into Interest Expense $ (1,273) $ (2,952) $ (1,727) Total amount of Interest Expense presented in the consolidated statements of operations $ (65,656) $ (51,292) $ (54,990) Total amount of Loss on Extinguishment of Debt presented in the consolidated statements of operations $ — $ — $ (9,336) Piedmont estimates that approximately $2.8 million will be reclassified from OCI as an increase 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, 2022. 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 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. However, as of December 31, 2022, all of Piedmont's interest rate swap agreements are in an asset position. 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 Fina

Fair Value Measurements of Financial Instruments	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements of Financial Instruments	Fair Value Measurements of Financial Instruments Piedmont considers its cash and cash equivalents, tenant receivables, notes receivable, 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, 2022 and 2021, respectively (in thousands): December 31, 2022 December 31, 2021 Financial Instrument Carrying Value Estimated Level Within Fair Value Hierarchy Carrying Value Estimated Level Within Fair Value Hierarchy Assets: Cash and cash equivalents (1) $ 16,536 $ 16,536 Level 1 $ 7,419 $ 7,419 Level 1 Tenant receivables, net (1) $ 4,762 $ 4,762 Level 1 $ 2,995 $ 2,995 Level 1 Notes receivable $ — $ — Level 2 $ 118,500 $ 120,075 Level 2 Restricted cash and escrows (1) $ 3,064 $ 3,064 Level 1 $ 1,441 $ 1,441 Level 1 Interest rate swaps $ 4,183 $ 4,183 Level 2 $ — $ — Level 2 Liabilities: Accounts payable and accrued expenses (1) $ 63,225 $ 63,225 Level 1 $ 45,065 $ 45,065 Level 1 Interest rate swaps $ — $ — Level 2 $ 4,924 $ 4,924 Level 2 Debt, net $ 1,983,681 $ 1,825,723 Level 2 $ 1,877,790 $ 1,938,563 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, 2022 and 2021, and its notes receivable were carried at book value as of December 31, 2021; however, Piedmont's estimate of the fair value of each of these financial instruments as of each period end is disclosed in the table above. Piedmont uses widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of its notes receivables and debt, including the period to maturity of each note receivable and debt facility, and uses observable market-based inputs for similar loan and debt facilities which have transacted recently in the market. Scaling adjustments are made to these inputs to make them applicable to the remaining life of Piedmont's notes receivables and outstanding debt. Consequently, the estimated fair values of the notes receivable and debt as of December 31, 2021 and the estimated fair value of debt as of December 31, 2022 are considered to be based on significant other observable inputs (Level 2). Piedmont has not changed its valuation technique for estimating the fair value of its notes receivable or debt. Piedmont’s interest rate swap agreements presented above, and as further discussed in Note 5 are classified as “Interest rate swaps” in the accompanying consolidated balance sheets and were carried at estimated fair value as of December 31, 2022 and 2021. 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 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, 2022 and 2021, 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 derivatives to be Level 3 financial instruments.

Impairment Loss on Real Estate

Impairment Loss on Real Estate Assets	12 Months Ended
	Dec. 31, 2022
Real Estate [Abstract]
Impairment Loss on Real Estate Assets	Impairment Loss on Real Estate Assets Piedmont recorded the following impairment losses on real estate assets for the years ended December 31, 2022, 2021, and 2020 (in thousands): 2022 2021 2020 9320 Excelsior Boulevard (1) $ 10,000 $ — $ — Two Pierce Place (1) — 41,000 — Total impairment loss on real estate assets $ 10,000 $ 41,000 $ — (1) Management shortened the intended hold period for the building 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 less costs to sell. The estimated fair values were determined based on net contract prices with unrelated, third-party purchasers. The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
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. Such commitments are accrued and capitalized as the related expenditures are incurred. In addition to the amounts that Piedmont has already committed to as a part of executed leases, Piedmont also anticipates continuing to incur similar market-based tenant improvement allowances and leasing commissions in conjunction with procuring future leases for its existing portfolio of properties. Both the timing and magnitude of expenditures related to future leasing activity can vary due to a number of factors and are highly dependent on the size of the leased square footage and the competitive market conditions of the particular office market at the time a lease is being negotiated. 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, whic h could result in requests for refunds of previously recognized tenant reimbursement revenues, resulting in financial loss to Piedmont. There were no such reductions during the three years ended December 31, 2022. 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

Related Party Transactions	12 Months Ended
	Dec. 31, 2022
Related Party Transactions [Abstract]
Related-Party Transactions	Related-Party Transactions There were no related-party transactions during the three years ended December 31, 2022 other than d uring the year ended December 31, 2020, Piedmont recognized approximately $0.1 million of expense related to a consulting agreement with its former Chief Investment Officer.

Stock Based Compensation

Stock Based Compensation	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Stock Based Compensation	Stock Based CompensationThe Compensation Committee of Piedmont's Board of Directors has granted deferred stock award units to eligible employees at its discretion based upon the previous year's financial results measured against various board approved performance metrics. Most employee awards vest ratably over three years. In addition, Piedmont's independent directors receive an annual grant of deferred stock award units for services rendered and such awards vest over a one year service period. Certain management employees' long-term equity incentive program is split equally between the deferred stock award units described above and a multi-year performance share program whereby actual awards are contingent upon Piedmont's total stockholder return ("TSR") performance relative to the TSR of a peer group of office REITs. The target incentives for these certain employees, as well as the peer group to be used for comparative purposes, are predetermined by the board of directors, advised by an outside compensation consultant. The number of shares earned, if any, are determined at the end of the multi-year performance period (or upon termination) and vest immediately. In the event that a participant's employment is terminated prior to the end of the multi-year period, in certain circumstances the participant may be entitled to a pro-rated award based on Piedmont's TSR relative performance as of the termination date. The grant date fair value of the multi-year performance share awards is estimated using the Monte Carlo valuation method. A rollforward of Piedmont's equity based award activity for the year ended December 31, 2022 is as follows: Shares Weighted-Average Grant Date Fair Value Unvested and Potential Stock Awards as of December 31, 2021 1,099,181 $ 23.97 Deferred Stock Awards Granted 311,050 $ 16.30 Change in Estimated Potential Share Awards based on TSR Performance (74,487) $ 21.84 Performance Stock Awards Vested (300,634) $ 28.80 Deferred Stock Awards Vested (296,229) $ 19.02 Deferred Stock Awards Forfeited (9,457) $ 17.94 Unvested and Potential Stock Awards as of December 31, 2022 729,424 $ 19.21 The following table provides additional information regarding stock award activity during the years ended 2022, 2021, and 2020 (in thousands except for per share amounts): 2022 2021 2020 Weighted-Average Grant Date Fair Value per share of Deferred Stock Granted During the Period $ 16.30 $ 17.24 $ 22.39 Total Grant Date Fair Value of Deferred Stock Vested During the Period $ 6,414 $ 5,242 $ 4,826 Share-based Liability Awards Paid During the Period (1) $ 5,481 $ 3,610 $ 4,116 (1) Amounts reflect the issuance of performance share awards related to the 2019-21, 2018-20, and 2017-19 Performance Share Plans during the years ended December 31, 2022, 2021, and 2020, respectively. A detail of Piedmont’s outstanding stock awards and programs as of December 31, 2022 is as follows: Date of grant Type of Award Net Shares Granted (1) Grant Vesting Schedule Unvested and Potential Shares as of December 31, 2022 May 3, 2019 Deferred Stock Award 30,958 (2) $ 21.04 Of the shares granted, 20% vested or will vest on July 1, 2020, 2021, 2022, 2023 and 2024, respectively. 19,011 February 19, 2020 Deferred Stock Award 141,018 $ 24.41 Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on February 19, 2021, 2022, and 2023, respectively. 37,691 March 19, 2020 Fiscal Year 2020-2022 Performance Share Program — $ 25.83 Shares awarded, if any, will vest immediately upon determination of award in 2023. 90,063 February 17, 2021 Deferred Stock Award 236,388 $ 17.15 Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on February 17, 2022, 2023, and 2024, respectively. 117,647 February 18, 2021 Fiscal Year 2021-2023 Performance Share Program — $ 23.04 Shares awarded, if any, will vest immediately upon determination of award in 2024. 77,394 (3) February 10, 2022 Deferred Stock Award 227,436 $ 16.85 Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on February 10, 2023, 2023, and 2025, respectively. 172,306 February 17, 2022 Fiscal Year 2022-2024 Performance Share Program — $ 17.77 Shares awarded, if any, will vest immediately upon determination of award in 2025. 162,550 (3) May 11, 2022 Deferred Stock Award-Board of Directors 52,762 $ 13.61 Of the shares granted, 100% will vest on the earlier of the 2023 Annual Meeting or May 11, 2023. 52,762 Total 729,424 (1) Amounts reflect the total original grant to employees and independent directors, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2022. (2) Includes a special, one-time deferred stock award to Piedmont's Chief Executive Officer effective July 1, 2019, the date of his promotion to the position, which vests in ratable installments over a five year period beginning July 1, 2020. (3) Estimated based on Piedmont's cumulative TSR for the respective performance period through December 31, 2022. Share estimates are subject to change in future periods based upon Piedmont's relative TSR performance compared to its peer group of office REITs. During the years ended December 31, 2022, 2021, and 2020, Piedmont recognized approximately $8.8 million, $11.0 million and $9.7 million of compensation expense related to stock awards, of which approximately $7.7 million, $9.7 million and $8.5 million related to the amortization of unvested shares and potential stock awards and the fair value adjustment for liability awards, respectively. During the year ended December 31, 2022, a total of 362,863 shares (net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations) were issued to employees and independent directors. As of December 31, 2022, approximately $5.5 million of unrecognized compensation cost related to unvested and potential stock awards remained, which Piedmont will record in its consolidated statements of operations over a weighted-average vesting period of approximately one year.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share There are no adjustments to “Net income/(loss) applicable to Piedmont” for the diluted earnings per share computations. Net income/(loss) 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 unvested deferred stock awards. Diluted weighted average number of common shares reflects the potential dilution under the treasury stock method that would occur if the remaining unvested and potential stock awards vested and resulted in additional common shares outstanding. Unvested and potential stock awards which are determined to be anti-dilutive are not included in the calculation of diluted weighted average common shares. For each of the years ended December 31, 2022, 2021, and 2020, Piedmont calculated and excluded weighted average outstanding anti-dilutive shares of approximately 421,005, 1,114,025, and 289,681, respectively. 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, 2022, 2021, and 2020, respectively (in thousands): 2022 2021 2020 Weighted-average common shares—basic 123,351 123,978 125,730 Plus: Incremental weighted-average shares from time-vested deferred and performance stock awards 173 — 374 Weighted-average common shares—diluted 123,524 123,978 126,104

Operating Leases

Operating Leases	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Operating Leases	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 exists 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, 2022 is presented below (in thousands): Years ending December 31: 2023 $ 427,890 2024 406,853 2025 364,400 2026 318,914 2027 275,993 Thereafter 1,049,204 Total $ 2,843,254 Piedmont recognized the following fixed and variable lease payments, which together comprised rental and tenant reimbursement revenue in the accompanying consolidated statements of operations for the years ended December 31, 2022, 2021, and 2020, respectively, as follows (in thousands): 2022 2021 2020 Fixed payments $ 451,403 $ 427,174 $ 433,841 Variable payments 94,338 87,445 86,112 Total Rental and Tenant Reimbursement Revenue $ 545,741 $ 514,619 $ 519,953 Operating leases where Piedmont is the lessee relat e primarily to office space in buildings owned by third parties and managed by Piedmont. Piedmont's right to use asset lease liability . For both the years ended December 31, 2022 and December 31, 2021, Piedmont recognized approximately $0.1 million of operating lease costs. As of December 31, 2022, the lease term of Piedmont's right of use asset is two years, and the discount rate is 3.86%.
Operating Leases	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 exists 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, 2022 is presented below (in thousands): Years ending December 31: 2023 $ 427,890 2024 406,853 2025 364,400 2026 318,914 2027 275,993 Thereafter 1,049,204 Total $ 2,843,254 Piedmont recognized the following fixed and variable lease payments, which together comprised rental and tenant reimbursement revenue in the accompanying consolidated statements of operations for the years ended December 31, 2022, 2021, and 2020, respectively, as follows (in thousands): 2022 2021 2020 Fixed payments $ 451,403 $ 427,174 $ 433,841 Variable payments 94,338 87,445 86,112 Total Rental and Tenant Reimbursement Revenue $ 545,741 $ 514,619 $ 519,953 Operating leases where Piedmont is the lessee relat e primarily to office space in buildings owned by third parties and managed by Piedmont. Piedmont's right to use asset lease liability . For both the years ended December 31, 2022 and December 31, 2021, Piedmont recognized approximately $0.1 million of operating lease costs. As of December 31, 2022, the lease term of Piedmont's right of use asset is two years, and the discount rate is 3.86%.

Property Dispositions and Asset

Property Dispositions and Assets Held for Sale	12 Months Ended
	Dec. 31, 2022
Discontinued Operations and Disposal Groups [Abstract]
Property Dispositions and Assets Held for Sale	Property Dispositions and Assets Held for Sale Property Dispositions None of Piedmont's property dispositions during the three years ended December 31, 2022 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 operations. Details of such properties sold are presented below (in thousands): Buildings Sold Location Reportable Segment Date of Sale Gain on Sale of Real Estate Assets Net Sales Proceeds 1901 Market Street Philadelphia, Pennsylvania Other June 25, 2020 $ 191,030 $ 350,805 New Jersey Portfolio Various (1) New York October 28, 2020 $ 14,636 $ 9,289 (2) Two Pierce Place Itasca, Illinois Other January 25, 2022 $ 1,741 $ 24,272 225 and 235 Presidential Way Boston, Massachusetts Boston January 28, 2022 $ 49,218 $ 119,609 Cambridge Portfolio (3) Cambridge, Massachusetts Boston December 2022 (3) $ 102,570 $ 155,307 (1) The New Jersey Portfolio is comprised of the following three properties: 200 Bridgewater Crossing in Bridgewater, New Jersey; 400 Bridgewater Crossing in Bridgewater, New Jersey; and 600 Corporate Drive in Lebanon, New Jersey. (2) Excludes $118.5 million in proceeds received by Piedmont during the year ended December 31, 2022 resulting from the payoff of two notes receivable that Piedmont had received in late 2020 from the buyer of the New Jersey Portfolio. Additionally, during the year ended December 31, 2022, Piedmont reduced the gain on sale previously recognized as a result of returning $1.8 million in previously escrowed sales proceeds to the purchaser. (3) The Cambridge Portfolio is comprised of the One Brattle Square building and the 1414 Massachusetts Avenue building in Cambridge, Massachusetts. The closing date for One Brattle Square was December 13, 2022, and the sale of 1414 Massachusetts Avenue closed on December 20, 2022. Assets Held for Sale The 225 and 235 Presidential Way assets met the criteria to be presented in the accompanying consolidated balance sheet as held for sale assets as of December 31, 2021. Details of such amounts as of December 31, 2021 are as follows (in thousands): December 31, 2021 Real estate assets held for sale, net: Land $ 7,750 Building and improvements, less accumulated depreciation of $16,699 as of December 31, 2021 55,110 Construction in progress 1,027 Total real estate assets held for sale, net $ 63,887 Other assets held for sale, net: Straight-line rent receivables $ 2,966 Deferred lease costs, less accumulated amortization of $996 as of December 31, 2021 5,427 Total other assets held for sale, net $ 8,393

Supplemental Disclosures for th

Supplemental Disclosures for the Statement of Consolidated Cash Flows	12 Months Ended
	Dec. 31, 2022
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosures for the Statement of Consolidated Cash Flows	Supplemental Disclosures for the Statement of Consolidated Cash Flows Certain noncash investing and financing activities for the years ended December 31, 2022, 2021, and 2020 (in thousands) are outlined below: 2022 2021 2020 Accrued capital expenditures and deferred lease costs $ 24,379 $ 24,817 $ 20,103 Change in accrued dividends $ (691) $ (365) $ (744) Change in accrued share repurchases as part of an announced plan $ — $ (685) $ 685 Notes receivable issued in conjunction with property dispositions $ — $ — $ 118,500 Accrued deferred financing costs $ 44 $ — $ — The following table provides a reconciliation of cash, cash equivalents, and restricted cash and escrows as presented in the accompanying consolidated statements of cash flows for the years ended December 31, 2022, 2021, and 2020 to the consolidated balance sheets for the respective period (in thousands): 2022 2021 2020 Cash and cash equivalents, beginning of period $ 7,419 $ 7,331 $ 13,545 Restricted cash and escrows, beginning of period 1,441 1,883 1,841 Total cash, cash equivalents, and restricted cash and escrows as presented in the accompanying consolidated statement of cash flows, beginning of period $ 8,860 $ 9,214 $ 15,386 Cash and cash equivalents, end of period $ 16,536 $ 7,419 $ 7,331 Restricted cash and escrows, end of period 3,064 1,441 1,883 Total cash, cash equivalents, and restricted cash and escrows as presented in the accompanying consolidated statement of cash flows, end of period $ 19,600 $ 8,860 $ 9,214 Amounts in restricted cash and escrows typically represent: escrow accounts required for future property repairs; escrow accounts for the payment of real estate taxes as required under certain of Piedmont's debt agreements; earnest money deposited by a buyer to secure the purchase of one of Piedmont's properties; or security or utility deposits held for tenants as a condition of their lease agreement.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Piedmont’s income tax basis net income/(loss) for the years ended December 31, 2022, 2021, and 2020, is calculated as follows (in thousands): 2022 2021 2020 GAAP basis financial statement net income/(loss) $ 146,830 $ (1,153) $ 232,688 Increase/(decrease) in net income/(loss) resulting from: Depreciation and amortization expense recognized for financial reporting purposes in excess of amounts recognized for income tax purposes 96,694 75,969 73,784 Rental income accrued for income tax purposes less than amounts for financial reporting purposes (26,211) (18,798) (25,726) Net amortization of above/below-market lease intangibles for income tax purposes in excess of amounts for financial reporting purposes (13,022) (9,465) (11,625) Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes (137,871) — (222,037) Taxable income or loss of Piedmont Washington Properties, Inc., in excess of amount for financial reporting purposes 3,111 3,518 1,345 Other expenses, including impairment loss on real estate assets, for financial reporting purposes in excess of amounts for income tax purposes 30,310 51,095 10,970 Taxable income for POH in excess of/(less than) amount for financial reporting purposes — (654) 1,499 Income tax basis net income, prior to dividends paid deduction $ 99,841 $ 100,512 $ 60,898 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: 2022 2021 2020 Ordinary income 82.85 % 96.34 % 91.91 % Return of capital 3.79 % 3.66 % 8.09 % Capital gains 13.36 % — % — % 100 % 100 % 100 % Piedmont has no uncertain tax positions as of December 31, 2022 and 2021, respectively. Piedmont recognized approximately $0, $0, and $1.0 million of recoveries of previously recorded estimated accrued interest and penalties for the years ended December 31, 2022, 2021 and 2020. The tax years 2019 to 2021 remain open to examination by various federal and state taxing authorities.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Segment Information	Segment Information Piedmont's President and Chief Executive Officer has been identified as Piedmont's chief operating decision maker ("CODM"), as defined by GAAP. The CODM evaluates Piedmont's portfolio and assesses the ongoing operations and performance of its properties utilizing the following geographic segments: Atlanta, Dallas, Washington, D.C./Northern Virginia, Boston, Orlando, Minneapolis, and New York. These operating segments are also Piedmont’s reportable segments. As of December 31, 2022, Piedmont also owned two properties in Houston that do not meet the definition of an operating or reportable segment as the CODM does not regularly review these properties for purposes of allocating resources or assessing performance. Further, Piedmont does not maintain a significant presence or anticipate further investment in this market. These two properties are the primary contributors to accrual-based net operating income ("NOI") included in "Other" below. During the periods presented, there have been no material inter segment transactions. The accounting policies of the reportable segments are the same as Piedmont's accounting policies. Accrual-based net operating income ("NOI") by geographic segment is the primary performance measure reviewed by Piedmont's CODM to assess operating performance and consists only of revenues and expenses directly related to real estate rental operations. NOI is calculated by deducting property operating costs from lease revenues and other property related income. NOI reflects property acquisitions and dispositions, occupancy levels, rental rate increases or decreases, and the recoverability of operating expenses. Piedmont's calculation of NOI may not be directly comparable to similarly titled measures calculated by other REITs. Asset value information and capital expenditures by segment are not reported because the CODM does not use these measures to assess performance. The following table presents accrual-based lease revenue and other property related income included in NOI by geographic reportable segment (in thousands): Years Ended December 31, 2022 2021 2020 Atlanta $ 131,230 $ 98,330 $ 95,403 Dallas 109,298 110,729 101,727 Washington, D.C./Northern Virginia 63,534 60,329 59,760 Minneapolis 61,530 61,563 61,465 Boston 59,212 65,445 61,338 Orlando 58,203 54,603 54,886 New York 56,189 52,454 69,827 Total reportable segments 539,196 503,453 504,406 Other 24,570 25,257 30,618 Total Revenues $ 563,766 $ 528,710 $ 535,024 The following table presents NOI by geographic reportable segments (in thousands): Years Ended December 31, 2022 2021 2020 Atlanta $ 82,878 $ 62,772 $ 60,276 Dallas 62,444 66,155 59,845 Washington, D.C./Northern Virginia 39,994 36,914 36,696 Boston 39,101 45,587 41,722 Orlando 35,327 33,449 34,427 Minneapolis 31,886 32,538 33,588 New York 31,252 30,049 38,990 Total reportable segments 322,882 307,464 305,544 Other 14,685 10,163 13,915 Total NOI $ 337,567 $ 317,627 $ 319,459 A reconciliation of Net income/(loss) applicable to Piedmont to NOI is presented below (in thousands): Years Ended December 31, 2022 2021 2020 Net income/(loss) applicable to Piedmont $ 146,830 $ (1,153) $ 232,688 Management fee revenue (1) (1,004) (1,269) (1,495) Depreciation and amortization 224,553 206,608 203,869 Impairment losses 25,981 41,000 — General and administrative expenses 29,127 30,252 27,464 Interest expense 65,656 51,292 54,990 Other income (1,847) (9,089) (1,724) Loss on extinguishment of debt — — 9,336 Gain on sale of real estate assets (151,729) — (205,666) Net loss applicable to noncontrolling interests — (14) (3) NOI $ 337,567 $ 317,627 $ 319,459 (1) Presented net of related operating expenses incurred to earn such management fee revenue. Such operating expenses are a component of property operating costs in the accompanying consolidated statements of operations.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Declaration of Dividend for the First Quarter 2023 On February 1, 2023, the board of directors declared a dividend for the first quarter 2023 in the amount of $0.21 per share on its common stock to stockholders of record as of the close of business on February 24, 2023, payable on March 17, 2023. Term Loan Facility On January 31, 2023, Piedmont entered into an additional new $215 million term loan facility priced at Adjusted SOFR + 105 basis points with a final extended maturity date of January 31, 2025, inclusive of a one year extension option. Piedmont intends to use the proceeds from the facility, along with a combination of cash on hand, proceeds from select property dispositions, and/or a draw on its $600 Million Unsecured 2022 Line of Credit to repay its $350 Million Unsecured Senior Notes due 2023 that mature June 1, 2023.

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2022
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III - Real Estate and Accumulated Depreciation	Schedule III - Real Estate and Accumulated Depreciation December 31, 2022 (dollars in thousands) Initial Cost to Piedmont Gross Amount of Which Carried at December 31, 2022 Description (1) Location Ownership Encumbrances Land Buildings and Total (2) Costs Capitalized Subsequent to Acquisition (3) Land Buildings and Total (4) Accumulated Date of Date 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 7,248 5,506 46,757 52,263 24,647 1994 12/21/2000 0 - 40 CRESCENT RIDGE II Minnetonka, MN 100 % None 7,700 45,154 52,854 12,887 8,021 57,720 65,741 30,950 2000 12/21/2000 0 - 40 90 CENTRAL STREET Boxborough, MA 100 % None 3,642 29,497 33,139 3,408 3,642 32,905 36,547 16,649 2001 5/3/2002 0 - 40 6031 CONNECTION DRIVE Irving, TX 100 % None 3,157 43,656 46,813 9,664 3,157 53,320 56,477 25,236 1999 8/15/2002 0 - 40 6021 CONNECTION DRIVE Irving, TX 100 % None 3,157 42,662 45,819 12,160 3,157 54,822 57,979 29,809 2000 8/15/2002 0 - 40 6011 CONNECTION DRIVE Irving, TX 100 % None 3,157 29,034 32,191 18,524 3,157 47,558 50,715 18,888 1999 8/15/2002 0 - 40 US BANCORP CENTER Minneapolis, MN 100 % None 11,138 175,629 186,767 31,293 11,138 206,922 218,060 105,153 2000 5/1/2003 0 - 40 GLENRIDGE HIGHLANDS TWO Atlanta, GA 100 % None 6,662 69,031 75,693 (2,744) 6,662 66,287 72,949 29,321 2000 8/1/2003 0 - 40 400 VIRGINIA AVE Washington, DC 100 % None 22,146 49,740 71,886 6,868 22,146 56,608 78,754 24,751 1985 11/19/2003 0 - 40 4250 NORTH FAIRFAX DRIVE Arlington, VA 100 % None 13,636 70,918 84,554 18,576 13,636 89,494 103,130 43,595 1998 11/19/2003 0 - 40 1225 EYE STREET Washington, DC 98.1 % None 21,959 47,602 69,561 9,900 21,959 57,502 79,461 29,964 1986 11/19/2003 0 - 40 1201 EYE STREET Washington, DC 98.6 % None 31,985 63,139 95,124 13,236 31,985 76,375 108,360 34,935 2001 11/19/2003 0 - 40 60 BROAD STREET New York, NY 100 % None 32,522 168,986 201,508 94,553 60,708 235,353 296,061 77,272 1962 12/31/2003 0 - 40 3100 CLARENDON BOULEVARD Arlington, VA 100 % None 11,700 69,705 81,405 52,362 11,791 121,976 133,767 48,497 1987 12/9/2004 0 - 40 LAS COLINAS CORPORATE CENTER I Irving, TX 100 % None 3,912 18,830 22,742 (3,056) 2,543 17,143 19,686 7,839 1998 8/31/2006 0 - 40 LAS COLINAS CORPORATE CENTER II Irving, TX 100 % None 4,496 29,881 34,377 (826) 2,543 31,008 33,551 14,532 1998 8/31/2006 0 - 40 ONE MERIDIAN CROSSINGS Richfield, MN 100 % None 2,919 24,398 27,317 931 2,919 25,329 28,248 8,620 1997 10/1/2010 0 - 40 Initial Cost Gross Amount of Which Carried at December 31, 2022 Description (1) Location Ownership Encumbrances Land Buildings and Total (2) Costs Capitalized Subsequent to Acquisition (3) Land Buildings and Total (4) Accumulated Date of Date Life on which Depreciation and Amortization in Latest Statements of Comprehensive Income is Computed (in years) (5) TWO MERIDIAN CROSSINGS Richfield, MN 100 % None 2,661 25,742 28,403 1,027 2,661 26,769 29,430 8,903 1998 10/1/2010 0 - 40 THE MEDICI Atlanta, GA 100 % None 1,780 11,510 13,290 5,193 1,780 16,703 18,483 7,013 2008 6/7/2011 0 - 40 400 TOWNPARK Lake Mary, FL 100 % None 2,570 20,555 23,125 4,824 2,570 25,379 27,949 9,360 2008 11/10/2011 0 - 40 ARLINGTON GATEWAY Arlington, VA 100 % None 36,930 129,070 166,000 3,364 36,930 132,434 169,364 36,149 2005 3/4/2013 0 - 40 5 & 15 WAYSIDE ROAD Burlington, MA 100 % None 7,190 55,445 62,635 5,772 7,190 61,217 68,407 18,590 1999 / 2001 3/22/2013 0 - 40 6565 MACARTHUR BOULEVARD Irving, TX 100 % None 4,820 37,767 42,587 4,480 4,820 42,247 47,067 11,623 1998 12/5/2013 0 - 40 ONE LINCOLN PARK Dallas, TX 100 % None 6,640 44,810 51,450 9,598 6,640 54,408 61,048 12,418 1999 12/20/2013 0 - 40 161 CORPORATE CENTER Irving, TX 100 % None 2,020 10,680 12,700 745 2,020 11,425 13,445 2,928 1998 12/30/2013 0 - 40 5 WALL STREET Burlington, MA 100 % None 9,560 50,276 59,836 6,108 9,560 56,384 65,944 12,851 2008 6/27/2014 0 - 40 1155 PERIMETER CENTER WEST Atlanta, GA 100 % None 5,870 66,849 72,719 18,665 5,870 85,514 91,384 16,629 2000 8/28/2014 0 - 40 500 TOWNPARK Lake Mary, FL 100 % None 2,147 21,925 24,072 5,123 2,147 27,048 29,195 5,609 2016 N/A 0 - 40 PARK PLACE ON TURTLE CREEK Dallas, TX 100 % None 4,470 38,048 42,518 7,553 4,470 45,601 50,071 10,682 1986 1/16/2015 0 - 40 80 CENTRAL STREET Boxborough, MA 100 % None 1,980 8,930 10,910 2,350 1,980 11,280 13,260 2,075 1988 7/24/2015 0 - 40 ENCLAVE PLACE Houston, TX 100 % None 1,890 60,094 61,984 35,319 1,890 95,413 97,303 17,620 2015 N/A 0 - 40 200 SOUTH ORANGE AVENUE Orlando, FL 100 % None 11,660 139,015 150,675 35,603 11,660 174,618 186,278 34,010 1988 11/4/2015 0 - 40 GALLERIA 300 Atlanta, GA 100 % None 4,000 73,554 77,554 8,916 4,000 82,470 86,470 18,462 1987 11/4/2015 0 - 40 GLENRIDGE HIGHLANDS ONE Atlanta, GA 100 % None 5,960 50,013 55,973 4,778 5,960 54,791 60,751 11,258 1998 11/24/2015 0 - 40 CNL CENTER I Orlando, FL 99 % None 6,470 77,858 84,328 1,191 6,470 79,049 85,519 16,141 1999 8/1/2016 0 - 40 CNL CENTER II Orlando, FL 99 % None 4,550 55,609 60,159 1,748 4,550 57,357 61,907 13,095 2006 8/1/2016 0 - 40 ONE WAYSIDE ROAD Boston, MA 100 % None 6,240 57,124 63,364 2,029 6,240 59,153 65,393 10,909 1997 / 2008 8/10/2016 0 - 40 Initial Cost Gross Amount of Which Carried at December 31, 2022 Description (1) Location Ownership Encumbrances Land Buildings and Total (2) Costs Capitalized Subsequent to Acquisition (3) Land Buildings and Total (4) Accumulated Date of Date Life on which Depreciation and Amortization in Latest Statements of Comprehensive Income is Computed (in years) (5) GALLERIA 200 Atlanta, GA 100 % None 6,470 55,825 62,295 20,446 6,470 76,271 82,741 14,027 1984 10/7/2016 0 - 40 750 WEST JOHN CARPENTER FREEWAY Irving, TX 100 % None 7,860 36,303 44,163 4,017 7,860 40,320 48,180 12,350 1999 11/30/2016 0 - 40 NORMAN POINTE I Bloomington, MN 100 % None 4,358 22,322 26,680 4,571 4,361 26,890 31,251 6,407 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 5,756 2003 2/23/2018 0 - 40 9320 EXCELSIOR BOULEVARD (6) Hopkins, MN 100 % None 3,760 35,289 39,049 (10,553) 3,707 24,789 28,496 8,654 2010 10/25/2018 0 - 40 25 BURLINGTON MALL ROAD Burlington, MA 100 % None 10,230 54,787 65,017 7,314 10,230 62,101 72,331 10,554 1987 12/12/2018 0 - 40 GALLERIA 100 Atlanta, GA 100 % None 7,285 72,449 79,734 2,592 7,285 75,041 82,326 10,639 1982 5/6/2019 0 - 40 GALLERIA 400 Atlanta, GA 100 % None 5,687 92,915 98,602 222 5,687 93,137 98,824 9,999 1999 8/23/2019 0 - 40 GALLERIA 600 Atlanta, GA 100 % None 5,418 81,003 86,421 5,281 5,418 86,284 91,702 8,144 2002 8/23/2019 0 - 40 ONE GALLERIA TOWER Dallas, TX 100 % None 5,286 107,767 113,053 11,985 5,286 119,752 125,038 17,500 1982 2/12/2020 0 40 TWO GALLERIA TOWER Dallas, TX 100 % None 3,835 109,605 113,440 5,330 3,836 114,934 118,770 16,309 1985 2/12/2020 0 40 THREE GALLERIA TOWER Dallas, TX 100 % None 6,541 125,490 132,031 9,141 6,541 134,631 141,172 17,539 1991 2/12/2020 0 40 222 SOUTH ORANGE AVENUE Orlando, FL 100 % None 1,899 18,417 20,316 3,534 1,899 21,951 23,850 57 1959 10/29/2020 0 40 999 PEACHTREE STREET Atlanta, GA 100 % None 49,067 156,109 205,176 6,422 49,067 162,531 211,598 13,123 1987 10/22/2021 0 40 1180 PEACHTREE STREET Atlanta, GA 100 % $ 197,000 56,932 389,654 446,586 (2) 56,932 389,652 446,584 7,524 2005 8/10/2022 0 40 UNDEVELOPED LAND PARCELS (7) Various 100 % None 48,667 — 48,667 3,457 45,782 6,342 52,124 139 N/A Various N/A Total—All Properties $ 546,496 $ 3,436,705 $ 3,983,201 $ 523,127 $ 567,244 $ 3,939,084 $ 4,506,328 $ 1,005,704 (1) All of Piedmont's properties are office buildings, except for the separately described Undeveloped Land Parcels. (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 $3.9 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) During the year ended December 31, 2022, Piedmont recognized a $10.0 million impairment charge on the 9320 Excelsior Boulevard asset. See Note 7 to the accompanying consolidated financial statements for further detail. (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, 2022 (dollars in thousands) 2022 2021 2020 Real Estate: Balance at the beginning of the year $ 4,206,993 $ 3,891,426 $ 3,818,287 Additions to/improvements of real estate 565,552 379,516 493,760 Assets disposed (214,728) — (393,231) Assets impaired (1) (10,000) (41,000) — Write-offs of intangible assets (2) (26,430) (13,646) (15,891) Write-offs of fully depreciated/amortized assets (15,059) (9,303) (11,499) Balance at the end of the year $ 4,506,328 $ 4,206,993 $ 3,891,426 Accumulated Depreciation and Amortization: Balance at the beginning of the year $ 961,682 $ 835,392 $ 875,777 Depreciation and amortization expense 166,234 149,239 142,762 Assets disposed (80,723) — (155,757) Write-offs of intangible assets (2) (26,430) (13,646) (15,891) Write-offs of fully depreciated/amortized assets (15,059) (9,303) (11,499) Balance at the end of the year $ 1,005,704 $ 961,682 $ 835,392 (1) Piedmont recognized an impairment loss on the 9320 Excelsior Building during the year ended December 31, 2022, as well as the Two Pierce Place building during the year ended December 31, 2021. (see Note 7 to the accompanying consolidated financial statements). (2) Consists of write-offs of intangible lease assets related to lease restructurings, amendments, and terminations.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Basis of Presentation	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.
Principles of Consolidation	All inter-company balances and transactions have been eliminated upon consolidation. Further, 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	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. The most significant of these estimates includes the underlying cash flows and holding periods used in assessing impairment, judgements regarding the recoverability of goodwill including the assumptions associated with the capitalization rates and discount rates used in valuing the properties in each reporting unit, and the assessment of the collectibility of receivables. While Piedmont has made, what it believes to be, appropriate accounting estimates based on the facts and circumstances available as of the reporting date, actual results could materially differ from those estimates.
Real Estate Assets	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 and other costs such as taxes and insurance 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 operating properties 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	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 a direct cost associated with obtaining a tenant includes commissions, tenant improvements, and other direct costs and is 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.
Cash and Cash Equivalents	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 associated with Piedmont's non-qualified deferred compensation program carried at estimated fair value.
Tenant Receivables and Straight-line Rent Receivables	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. Piedmont evaluates the collectibility of its operating lease receivables on a tenant/lease-specific basis and recognizes changes in the collectibility assessment of its operating lease receivables as a reduction of rental and tenant reimbursement revenues.
Allowance for Doubtful Accounts	Allowance for Doubtful AccountsAs detailed above, Piedmont records contra-revenue adjustments for tenant/lease-specific changes in the collectibility assessments of its operating lease receivables as a reduction of rental and tenant reimbursement revenues. These charges reduce tenant and straight-line rent receivable to net realizable value upon recognition. In addition, during the year ended December 31, 2020, Piedmont also established an allowance for doubtful accounts for amounts that may become uncollectible in the future.
Restricted Cash and Escrows	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 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 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, and is allocated to each of Piedmont's reporting units. (See Note 16 below for further detail). Piedmont tests the carrying value of the goodwill assigned to each of its reporting units for impairment on an annual basis, or on an interim basis if an event occurs or circumstances change that would indicate it is more likely than not that the fair value of a reporting unit may be less than its carrying value. 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 the carrying value of the entity. In performing its goodwill impairment assessment, Piedmont compares the estimated fair value of each of its reporting units to the reporting unit’s carrying value. If Piedmont concludes that the fair value of a reporting unit is less than its carrying value, then Piedmont would recognize a goodwill impairment loss equal to 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). Estimation of the fair value of each reporting unit involves projections of discounted future cash flows, which are derived using certain assumptions that are subjective in nature. Piedmont also makes assumptions about future market rental income amounts subsequent to the expiration of current lease agreements, property operating expenses, and the number of months it takes to re-lease the property, among other factors. Piedmont determined that its goodwill was impaired during the year ended December 31, 2022, and recorded a goodwill impairment loss equal to the excess of its Washington, D.C/Northern Virginia reporting unit’s carrying amount over its estimated fair value, or approximately $16.0 million, in the accompanying consolidated statement of operations. The fair value measurements used in the evaluation described above are considered to be Level 3 valuations within the fair value hierarchy as defined by GAAP as they involve projections of discounted future cash flows, which are derived from unobservable assumptions, the most subjective of which are capitalization rates and discount rates for each respective reporting unit.
Interest Rate Derivatives and Risk Management Objective of Using Derivatives	Interest Rate Derivatives Piedmont periodically enters into interest rate derivative agreements to hedge its exposure to changing interest rates. As of December 31, 2022 and 2021, 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 operations 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. Additionally, in conjunction with entering into various interest rate swap agreements during the year ended December 31, 2022 which are based upon the Secured Overnight Financing Rate ("SOFR") while the underlying debt is currently based upon LIBOR, Piedmont made an accounting policy election in accordance with Accounting Standards Codification ("ASC") Topic 848 Reference Rate Reform to assert that the hedged forecasted transactions remain probable of occurring and that the LIBOR reference rate is expected to be replaced by SOFR. 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.
Deferred Lease Costs	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. Deferred lease costs are amortized on a straight-line basis over the terms of the related underlying leases in the accompanying consolidated statements of operations as follows: • Approximately $57.9 million, $56.4 million, and $60.2 million of deferred lease costs are included in amortization expense for the years ended December 31, 2022, 2021, and 2020, respectively; and • Approximately $4.2 million, $3.9 million, and $3.4 million, of deferred lease costs related to lease incentives granted to tenants are included as an offset to rental and tenant reimbursement revenue for the years ended December 31, 2022, 2021, and 2020, respectively. Upon receipt of an early lease termination notice, Piedmont recognizes any unamortized deferred lease costs 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.
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; • tenant reimbursements related to operating expense or property tax expenses which may be due to tenants as part of an annual operating expense reconciliation; and • tenant improvement allowance overages or improvements funded by the tenant where Piedmont owns the underlying improvements. Deferred income related to prepaid rents from tenants will be recognized as rental 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 or improvements paid for 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. 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 tenants for tenant improvements owned by Piedmont are treated as deferred income 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 and 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 is satisfied over the length of the contract, not at any specific point in time, and has 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
Shares-in-trust, Preferred Stock, Common Stock, Dividends	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. Under its board-authorized stock repurchase program, 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, 2022, Piedmont had approximately $150.5 million of remaining capacity under the program which may be used for share repurchases through February 2024. 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
Noncontrolling Interest	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 operations.
Stock-based Compensation	Stock-based Compensation Piedmont has issued stock-based compensation in the form of deferred stock units to its employees and board of directors. For employees, Piedmont's Long-term Incentive Compensation ("LTIC") program is comprised of an annual deferred stock unit component (the "Annual Deferred Stock Unit" program) and a multi-year performance share component (the "Performance Share" program). All awards granted during the three years ended December 31, 2022 pursuant to both the Annual Deferred Stock Unit and Performance Share programs, as well as director's awards, were classified as equity awards and expensed on a straight-line basis over the vesting period, with issuances recorded as a reduction to additional paid in capital. Forfeitures are recorded when they occur. Prior to the three years ended December 31, 2022, awards granted pursuant to the Performance Share component of the LTIC program were classified as liability awards and remeasured at fair value as of the end of each reporting period during the service period, with issuances recorded as a reduction to accrued expense. 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 board of directors in the accompanying consolidated statements of operations.
Net Income/(Loss) Available to Common Stockholders Per Share	Net Income/(Loss) Available to Common Stockholders Per Share Net income/(loss) per share-basic is calculated as net income/(loss) available to common stockholders divided by the weighted average number of common shares outstanding during the period. Net income/(loss) per share-diluted is calculated as net income/(loss) 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	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 which have been provided for in the financial statements. These operations resulted in approximately $(10,000), $(379,000), and $4,000 in income tax expense/(recoveries) for the years ended December 31, 2022, 2021, and 2020, respectively, as a component of other income/(expense) in the accompanying consolidated statements of operations. 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 property operating costs in the accompanying consolidated financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Schedule of Real Estate Assets Useful Lives	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	Gross intangible assets and liabilities, inclusive of amounts classified as real estate assets held for sale, recorded as of December 31, 2022 and 2021, respectively, are as follows (in thousands): December 31, 2022 December 31, 2021 Intangible Lease Assets: Above-Market In-Place Lease Assets $ 1,147 $ 1,882 In-Place Lease Valuation $ 203,927 $ 176,275 Intangible Lease Origination Costs (included as component of Deferred Lease Costs) $ 285,777 $ 266,575 Intangible Lease Liabilities (Below-Market In-Place Leases) $ 93,372 $ 75,221
Schedule of Amortization Of Intangible Lease Costs	For the years ended December 31, 2022, 2021, and 2020, respectively, Piedmont recognized amortization of intangible lease costs in the accompanying consolidated statements of operations, as follows (in thousands): 2022 2021 2020 Amortization of Intangible Lease Origination Costs and In-Place Lease Valuation included in Amortization $ 74,167 $ 69,388 $ 77,000 Amortization of Above-Market and Below-Market In-Place Lease Intangibles as a net increase to Rental and Tenant Reimbursement Revenue $ 13,426 $ 11,180 $ 12,191
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Net intangible assets and liabilities as of December 31, 2022 will be amortized as follows (in thousands): Intangible Lease Assets Above-Market In-Place Lease Valuation Intangible Lease Origination Costs (1) Below-Market For the year ending December 31: 2023 $ 143 $ 29,520 $ 34,495 $ 12,581 2024 109 22,076 26,892 10,071 2025 31 16,680 21,541 8,440 2026 14 13,146 18,227 6,904 2027 13 10,426 15,010 5,814 Thereafter 30 22,192 33,220 13,139 $ 340 $ 114,040 $ 149,385 $ 56,949 Weighted-Average Amortization Period (in years) 4 6 6 6 (1) Included as a component of Deferred Lease Costs in the accompanying consolidated balance sheets.
Schedule of Allowance For Doubtful Accounts	Details of Piedmont's allowance for doubtful accounts for the years ended December 31, 2022, 2021, and 2020 are as follows: Balance at Beginning of Period Additions/Reversals as Decrease/(Increase) to Revenue Write-offs Balance at End of Period Year Ended December 31, 2022 $ 4,000 $ (3,000) $ — $ 1,000 2021 $ 4,553 $ 35 $ (588) $ 4,000 2020 $ — $ 8,734 $ (4,181) $ 4,553

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Schedule of Purchase Price Allocation	The purchase price of 1180 Peachtree Street, inclusive of approximately $2.2 million of closing costs, was allocated as follows: 1180 Peachtree Street Land $ 56,932 Building and improvements 336,228 Intangible lease assets (1) 53,426 Lease acquisition costs, net of tenant credits received from seller (1) (4,071) Intangible lease origination costs (1) 56,748 Intangible lease liabilities (1) (31,355) Total allocated purchase price $ 467,908 Assumption of secured mortgage note (197,000) Net cash paid upon acquisition $ 270,908 (1) Amortization of in-place lease intangibles and lease acquisition costs are recognized using the straight-line method over approximately 7.4 years, the average remaining life of in-place leases.

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Schedule of Debt	The following table summarizes the terms of Piedmont’s indebtedness outstanding as of December 31, 2022 and 2021, including net discounts/premiums and unamortized debt issuance costs (in thousands): Facility (1) Stated Rate Effective Rate (2) Maturity Amount Outstanding as of 2022 2021 Secured (Fixed) $197 Million Fixed Rate Mortgage 4.10 % 10/1/2028 $ 197,000 $ — 197,000 — Unsecured (Variable and Fixed) $350 Million Unsecured Senior Notes due 2023 3.40 % 3.43 % 6/01/2023 (3) 350,000 350,000 $200 Million Unsecured 2022 Term Loan Facility SOFR + 1.00% 5.42 % (4) 12/16/2024 (5) 200,000 — $400 Million Unsecured Senior Notes due 2024 4.45 % 4.10 % 3/15/2024 400,000 400,000 $250 Million Unsecured 2018 Term Loan LIBOR + 0.95% 4.54 % 3/31/2025 250,000 250,000 $600 Million Unsecured 2022 Line of Credit (6) SOFR + 0.85% — % (4) 6/30/2026 (7) — 290,000 $300 Million Unsecured Senior Notes due 2030 3.15 % 3.90 % 8/15/2030 300,000 300,000 $300 Million Unsecured Senior Notes due 2032 2.75 % 2.78 % 4/1/2032 300,000 300,000 Discounts and unamortized debt issuance costs (13,319) (12,210) Subtotal/Weighted Average (8) 3.87 % 1,786,681 1,877,790 Total/Weighted Average (8) 3.89 % $ 1,983,681 $ 1,877,790 (1) All of Piedmont’s outstanding debt as of December 31, 2022 is interest-only until maturity, except for the $197 Million Fixed Rate Mortgage, secured by 1180 Peachtree Street, which will begin amortizing principal in October 2023. (2) Effective rate after consideration of settled or in-place interest rate swap agreements and issuance discounts. (3) Piedmont currently intends to repay the $350 Million Unsecured Senior Notes due 2023 using proceeds from a new $215 million term loan (see Note 17 ), and a combination of cash on hand, proceeds from select property dispositions, and borrowings under our $600 Million Unsecured 2022 Line of Credit. (4) On a periodic basis, Piedmont may select from multiple interest rate options, including the prime rate and various-length SOFR locks on all or a portion of the principal. All SOFR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating. (5) Piedmont may extend the term for six additional months to a final extended maturity date of June 18, 2025, provided Piedmont is not then in default and all representations and warranties are true and correct in all material respects and upon payment of extension fees. (6) The $500 Million Unsecured 2018 Line of Credit was amended and restated during the year ended December 31, 2022 and is now reflected as the $600 Million Unsecured 2022 Line of Credit. The $500 Million Unsecured 2018 Line of Credit had a stated rate of LIBOR + 0.90% as of December 31, 2021. (7) Piedmont may extend the term for up to one (8) Weighted average is based on contractual balance of outstanding debt and the stated or effectively fixed interest rates as of December 31, 2022.
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, 2022, is provided below (in thousands): 2023 $ 350,000 2024 600,000 2025 250,000 2026 — 2027 — Thereafter 797,000 Total $ 1,997,000

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 is as follows: Interest Rate Derivatives: Number of Swap Agreements Associated Debt Instrument Notional Amount Effective Date Maturity Date Interest rate swaps 2 $250 Million Unsecured 2018 Term Loan $ 100 3/29/2018 3/31/2025 Interest rate swaps 3 $250 Million Unsecured 2018 Term Loan 75 12/2/2022 3/31/2025 Interest rate swaps 3 $250 Million Unsecured 2018 Term Loan 75 12/12/2022 3/31/2025 Total $ 250
Schedule of Interest Rate Derivatives	A detail of Piedmont’s interest rate derivatives on a gross and net basis as of December 31, 2022 and 2021, respectively, is as follows (in thousands): Interest rate swaps classified as: December 31, 2022 December 31, 2021 Gross derivative assets $ 4,183 $ — Gross derivative liabilities — (4,924) Net derivative liability $ 4,183 $ (4,924)
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)	The gain/(loss) on Piedmont's interest rate derivatives, including previously settled forward starting interest rate swaps, that was recorded in OCI and the accompanying consolidated statements of operations as a component of interest expense for the years ended December 31, 2022, 2021, and 2020, respectively, was as follows (in thousands): Interest Rate Swaps in Cash Flow Hedging Relationships: 2022 2021 2020 Amount of gain/(loss) recognized in OCI $ 8,202 $ 2,994 $ (26,794) Amount of previously recorded gain/(loss) reclassified from OCI into Interest Expense $ (1,273) $ (2,952) $ (1,727) Total amount of Interest Expense presented in the consolidated statements of operations $ (65,656) $ (51,292) $ (54,990) Total amount of Loss on Extinguishment of Debt presented in the consolidated statements of operations $ — $ — $ (9,336)

Fair Value Measurements of Fi_2

Fair Value Measurements of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Schedule of 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, 2022 and 2021, respectively (in thousands): December 31, 2022 December 31, 2021 Financial Instrument Carrying Value Estimated Level Within Fair Value Hierarchy Carrying Value Estimated Level Within Fair Value Hierarchy Assets: Cash and cash equivalents (1) $ 16,536 $ 16,536 Level 1 $ 7,419 $ 7,419 Level 1 Tenant receivables, net (1) $ 4,762 $ 4,762 Level 1 $ 2,995 $ 2,995 Level 1 Notes receivable $ — $ — Level 2 $ 118,500 $ 120,075 Level 2 Restricted cash and escrows (1) $ 3,064 $ 3,064 Level 1 $ 1,441 $ 1,441 Level 1 Interest rate swaps $ 4,183 $ 4,183 Level 2 $ — $ — Level 2 Liabilities: Accounts payable and accrued expenses (1) $ 63,225 $ 63,225 Level 1 $ 45,065 $ 45,065 Level 1 Interest rate swaps $ — $ — Level 2 $ 4,924 $ 4,924 Level 2 Debt, net $ 1,983,681 $ 1,825,723 Level 2 $ 1,877,790 $ 1,938,563 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 Estat_2

Impairment Loss on Real Estate Assets (Tables)	12 Months Ended
	Dec. 31, 2022
Real Estate [Abstract]
Schedule of Impairment Loss on Real Estate Assets	Piedmont recorded the following impairment losses on real estate assets for the years ended December 31, 2022, 2021, and 2020 (in thousands): 2022 2021 2020 9320 Excelsior Boulevard (1) $ 10,000 $ — $ — Two Pierce Place (1) — 41,000 — Total impairment loss on real estate assets $ 10,000 $ 41,000 $ — (1) Management shortened the intended hold period for the building 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 less costs to sell. The estimated fair values were determined based on net contract prices with unrelated, third-party purchasers. The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers.

Stock Based Compensation (Table

Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Schedule of Nonvested Share Activity	A rollforward of Piedmont's equity based award activity for the year ended December 31, 2022 is as follows: Shares Weighted-Average Grant Date Fair Value Unvested and Potential Stock Awards as of December 31, 2021 1,099,181 $ 23.97 Deferred Stock Awards Granted 311,050 $ 16.30 Change in Estimated Potential Share Awards based on TSR Performance (74,487) $ 21.84 Performance Stock Awards Vested (300,634) $ 28.80 Deferred Stock Awards Vested (296,229) $ 19.02 Deferred Stock Awards Forfeited (9,457) $ 17.94 Unvested and Potential Stock Awards as of December 31, 2022 729,424 $ 19.21 The following table provides additional information regarding stock award activity during the years ended 2022, 2021, and 2020 (in thousands except for per share amounts): 2022 2021 2020 Weighted-Average Grant Date Fair Value per share of Deferred Stock Granted During the Period $ 16.30 $ 17.24 $ 22.39 Total Grant Date Fair Value of Deferred Stock Vested During the Period $ 6,414 $ 5,242 $ 4,826 Share-based Liability Awards Paid During the Period (1) $ 5,481 $ 3,610 $ 4,116 (1) Amounts reflect the issuance of performance share awards related to the 2019-21, 2018-20, and 2017-19 Performance Share Plans during the years ended December 31, 2022, 2021, and 2020, respectively.
Schedule of Outstanding Employee Deferred Stock Awards	A detail of Piedmont’s outstanding stock awards and programs as of December 31, 2022 is as follows: Date of grant Type of Award Net Shares Granted (1) Grant Vesting Schedule Unvested and Potential Shares as of December 31, 2022 May 3, 2019 Deferred Stock Award 30,958 (2) $ 21.04 Of the shares granted, 20% vested or will vest on July 1, 2020, 2021, 2022, 2023 and 2024, respectively. 19,011 February 19, 2020 Deferred Stock Award 141,018 $ 24.41 Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on February 19, 2021, 2022, and 2023, respectively. 37,691 March 19, 2020 Fiscal Year 2020-2022 Performance Share Program — $ 25.83 Shares awarded, if any, will vest immediately upon determination of award in 2023. 90,063 February 17, 2021 Deferred Stock Award 236,388 $ 17.15 Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on February 17, 2022, 2023, and 2024, respectively. 117,647 February 18, 2021 Fiscal Year 2021-2023 Performance Share Program — $ 23.04 Shares awarded, if any, will vest immediately upon determination of award in 2024. 77,394 (3) February 10, 2022 Deferred Stock Award 227,436 $ 16.85 Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on February 10, 2023, 2023, and 2025, respectively. 172,306 February 17, 2022 Fiscal Year 2022-2024 Performance Share Program — $ 17.77 Shares awarded, if any, will vest immediately upon determination of award in 2025. 162,550 (3) May 11, 2022 Deferred Stock Award-Board of Directors 52,762 $ 13.61 Of the shares granted, 100% will vest on the earlier of the 2023 Annual Meeting or May 11, 2023. 52,762 Total 729,424 (1) Amounts reflect the total original grant to employees and independent directors, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2022. (2) Includes a special, one-time deferred stock award to Piedmont's Chief Executive Officer effective July 1, 2019, the date of his promotion to the position, which vests in ratable installments over a five year period beginning July 1, 2020.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of 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, 2022, 2021, and 2020, respectively (in thousands): 2022 2021 2020 Weighted-average common shares—basic 123,351 123,978 125,730 Plus: Incremental weighted-average shares from time-vested deferred and performance stock awards 173 — 374 Weighted-average common shares—diluted 123,524 123,978 126,104

Operating Leases (Tables)

Operating Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Schedule of 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, 2022 is presented below (in thousands): Years ending December 31: 2023 $ 427,890 2024 406,853 2025 364,400 2026 318,914 2027 275,993 Thereafter 1,049,204 Total $ 2,843,254
Schedule of Operating Lease, Lease Income	Piedmont recognized the following fixed and variable lease payments, which together comprised rental and tenant reimbursement revenue in the accompanying consolidated statements of operations for the years ended December 31, 2022, 2021, and 2020, respectively, as follows (in thousands): 2022 2021 2020 Fixed payments $ 451,403 $ 427,174 $ 433,841 Variable payments 94,338 87,445 86,112 Total Rental and Tenant Reimbursement Revenue $ 545,741 $ 514,619 $ 519,953

Property Dispositions and Ass_2

Property Dispositions and Assets Held for Sale (Tables)	12 Months Ended
	Dec. 31, 2022
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 Reportable Segment Date of Sale Gain on Sale of Real Estate Assets Net Sales Proceeds 1901 Market Street Philadelphia, Pennsylvania Other June 25, 2020 $ 191,030 $ 350,805 New Jersey Portfolio Various (1) New York October 28, 2020 $ 14,636 $ 9,289 (2) Two Pierce Place Itasca, Illinois Other January 25, 2022 $ 1,741 $ 24,272 225 and 235 Presidential Way Boston, Massachusetts Boston January 28, 2022 $ 49,218 $ 119,609 Cambridge Portfolio (3) Cambridge, Massachusetts Boston December 2022 (3) $ 102,570 $ 155,307 (1) The New Jersey Portfolio is comprised of the following three properties: 200 Bridgewater Crossing in Bridgewater, New Jersey; 400 Bridgewater Crossing in Bridgewater, New Jersey; and 600 Corporate Drive in Lebanon, New Jersey. (2) Excludes $118.5 million in proceeds received by Piedmont during the year ended December 31, 2022 resulting from the payoff of two notes receivable that Piedmont had received in late 2020 from the buyer of the New Jersey Portfolio. Additionally, during the year ended December 31, 2022, Piedmont reduced the gain on sale previously recognized as a result of returning $1.8 million in previously escrowed sales proceeds to the purchaser. (3) The Cambridge Portfolio is comprised of the One Brattle Square building and the 1414 Massachusetts Avenue building in Cambridge, Massachusetts. The closing date for One Brattle Square was December 13, 2022, and the sale of 1414 Massachusetts Avenue closed on December 20, 2022.
Schedule of Assets Held For Sale and Discontinued Operations	Details of such amounts as of December 31, 2021 are as follows (in thousands): December 31, 2021 Real estate assets held for sale, net: Land $ 7,750 Building and improvements, less accumulated depreciation of $16,699 as of December 31, 2021 55,110 Construction in progress 1,027 Total real estate assets held for sale, net $ 63,887 Other assets held for sale, net: Straight-line rent receivables $ 2,966 Deferred lease costs, less accumulated amortization of $996 as of December 31, 2021 5,427 Total other assets held for sale, net $ 8,393

Supplemental Disclosures for _2

Supplemental Disclosures for the Statement of Consolidated Cash Flows (Tables)	12 Months Ended
	Dec. 31, 2022
Supplemental Cash Flow Elements [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	Certain noncash investing and financing activities for the years ended December 31, 2022, 2021, and 2020 (in thousands) are outlined below: 2022 2021 2020 Accrued capital expenditures and deferred lease costs $ 24,379 $ 24,817 $ 20,103 Change in accrued dividends $ (691) $ (365) $ (744) Change in accrued share repurchases as part of an announced plan $ — $ (685) $ 685 Notes receivable issued in conjunction with property dispositions $ — $ — $ 118,500 Accrued deferred financing costs $ 44 $ — $ — The following table provides a reconciliation of cash, cash equivalents, and restricted cash and escrows as presented in the accompanying consolidated statements of cash flows for the years ended December 31, 2022, 2021, and 2020 to the consolidated balance sheets for the respective period (in thousands): 2022 2021 2020 Cash and cash equivalents, beginning of period $ 7,419 $ 7,331 $ 13,545 Restricted cash and escrows, beginning of period 1,441 1,883 1,841 Total cash, cash equivalents, and restricted cash and escrows as presented in the accompanying consolidated statement of cash flows, beginning of period $ 8,860 $ 9,214 $ 15,386 Cash and cash equivalents, end of period $ 16,536 $ 7,419 $ 7,331 Restricted cash and escrows, end of period 3,064 1,441 1,883 Total cash, cash equivalents, and restricted cash and escrows as presented in the accompanying consolidated statement of cash flows, end of period $ 19,600 $ 8,860 $ 9,214

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule of Tax Basis Income	Piedmont’s income tax basis net income/(loss) for the years ended December 31, 2022, 2021, and 2020, is calculated as follows (in thousands): 2022 2021 2020 GAAP basis financial statement net income/(loss) $ 146,830 $ (1,153) $ 232,688 Increase/(decrease) in net income/(loss) resulting from: Depreciation and amortization expense recognized for financial reporting purposes in excess of amounts recognized for income tax purposes 96,694 75,969 73,784 Rental income accrued for income tax purposes less than amounts for financial reporting purposes (26,211) (18,798) (25,726) Net amortization of above/below-market lease intangibles for income tax purposes in excess of amounts for financial reporting purposes (13,022) (9,465) (11,625) Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes (137,871) — (222,037) Taxable income or loss of Piedmont Washington Properties, Inc., in excess of amount for financial reporting purposes 3,111 3,518 1,345 Other expenses, including impairment loss on real estate assets, for financial reporting purposes in excess of amounts for income tax purposes 30,310 51,095 10,970 Taxable income for POH in excess of/(less than) amount for financial reporting purposes — (654) 1,499 Income tax basis net income, prior to dividends paid deduction $ 99,841 $ 100,512 $ 60,898
Schedule of Characterization Of Dividends To Common Stockholders	The composition of Piedmont’s distributions per common share is presented below: 2022 2021 2020 Ordinary income 82.85 % 96.34 % 91.91 % Return of capital 3.79 % 3.66 % 8.09 % Capital gains 13.36 % — % — % 100 % 100 % 100 %

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Schedule of Revenue and Net Operating Income, by Segment	The following table presents accrual-based lease revenue and other property related income included in NOI by geographic reportable segment (in thousands): Years Ended December 31, 2022 2021 2020 Atlanta $ 131,230 $ 98,330 $ 95,403 Dallas 109,298 110,729 101,727 Washington, D.C./Northern Virginia 63,534 60,329 59,760 Minneapolis 61,530 61,563 61,465 Boston 59,212 65,445 61,338 Orlando 58,203 54,603 54,886 New York 56,189 52,454 69,827 Total reportable segments 539,196 503,453 504,406 Other 24,570 25,257 30,618 Total Revenues $ 563,766 $ 528,710 $ 535,024 The following table presents NOI by geographic reportable segments (in thousands): Years Ended December 31, 2022 2021 2020 Atlanta $ 82,878 $ 62,772 $ 60,276 Dallas 62,444 66,155 59,845 Washington, D.C./Northern Virginia 39,994 36,914 36,696 Boston 39,101 45,587 41,722 Orlando 35,327 33,449 34,427 Minneapolis 31,886 32,538 33,588 New York 31,252 30,049 38,990 Total reportable segments 322,882 307,464 305,544 Other 14,685 10,163 13,915 Total NOI $ 337,567 $ 317,627 $ 319,459 A reconciliation of Net income/(loss) applicable to Piedmont to NOI is presented below (in thousands): Years Ended December 31, 2022 2021 2020 Net income/(loss) applicable to Piedmont $ 146,830 $ (1,153) $ 232,688 Management fee revenue (1) (1,004) (1,269) (1,495) Depreciation and amortization 224,553 206,608 203,869 Impairment losses 25,981 41,000 — General and administrative expenses 29,127 30,252 27,464 Interest expense 65,656 51,292 54,990 Other income (1,847) (9,089) (1,724) Loss on extinguishment of debt — — 9,336 Gain on sale of real estate assets (151,729) — (205,666) Net loss applicable to noncontrolling interests — (14) (3) NOI $ 337,567 $ 317,627 $ 319,459 (1) Presented net of related operating expenses incurred to earn such management fee revenue. Such operating expenses are a component of property operating costs in the accompanying consolidated statements of operations.

Organization (Details)

Organization (Details) ft² in Millions	Dec. 31, 2022 ft² property
Real Estate Properties [Line Items]
Number of real estate properties	4
Area of real estate property (in sq ft) | ft²	16.7
In-Service Office Properties
Real Estate Properties [Line Items]
Number of real estate properties	51
Percentage of class A commercial office space	86.70%
Redevelopment Asset
Real Estate Properties [Line Items]
Number of real estate properties	1

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) vote joint_venture property $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($)
Significant Accounting Policies [Line Items]
Number of real estate properties | property	4
Number of joint ventures | joint_venture	3
Goodwill impairment loss	$ 16,000,000
Amortization of deferred lease costs	57,900,000	$ 56,400,000	$ 60,200,000
Amortization of lease incentive	4,200,000	3,900,000	3,400,000
Amortization of fair value adjustments	0	300,000	500,000
Amortization of debt discount	600,000	500,000	300,000
Amortization of deferred financing costs and fair market value adjustments on notes payable	$ 2,800,000	$ 2,700,000	3,000,000
Shares-in-trust, shares authorized (in shares) | shares	150,000,000	150,000,000
Preferred stock, shares authorized (in shares) | shares	100,000,000	100,000,000
Common stock, shares authorized (in shares) | 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	$ 150,500,000
At-the-market offerings, maximum amount	250,000,000
Income tax expense (benefit)	$ (10,000)	$ (379,000)	$ 4,000
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 Accoun_5

Summary of Significant Accounting Policies - Real Estate Assets Useful Life (Details)	12 Months Ended
	Dec. 31, 2022
Buildings
Property, Plant and Equipment [Line Items]
Useful life	40 years
Building improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life	5 years
Building improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life	25 years
Land improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life	20 years
Land improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life	25 years
Furniture, fixtures, and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Furniture, fixtures, and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Gross Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible Lease Liabilities (Below-Market In-Place Leases)	$ 93,372	$ 75,221
Above-Market In-Place Lease Assets
Finite-Lived Intangible Assets [Line Items]
Intangible lease assets	1,147	1,882
In-Place Lease Valuation
Finite-Lived Intangible Assets [Line Items]
Intangible lease assets	203,927	176,275
Intangible Lease Origination Costs (included as component of Deferred Lease Costs)
Finite-Lived Intangible Assets [Line Items]
Intangible lease assets	$ 285,777	$ 266,575

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Intangible Asset Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Amortization of Intangible Lease Origination Costs and In-Place Lease Valuation included in Amortization	$ 74,167	$ 69,388	$ 77,000
Amortization of Above-Market and Below-Market In-Place Lease Intangibles as a net increase to Rental and Tenant Reimbursement Revenue	$ 13,426	$ 11,180	$ 12,191

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Future Amortization of Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Intangible Lease Assets
Total	$ 114,380	$ 94,380
Intangible Lease Origination Costs
2023	34,495
2024	26,892
2025	21,541
2026	18,227
2027	15,010
Thereafter	33,220
Total	$ 149,385
Weighted-Average Amortization Period (in years)	6 years
Below-Market In-place Lease Liabilities
2023	$ 12,581
2024	10,071
2025	8,440
2026	6,904
2027	5,814
Thereafter	13,139
Total	$ 56,949
Weighted-Average Amortization Period (in years)	6 years
Above-Market In-Place Lease Assets
Intangible Lease Assets
2023	$ 143
2024	109
2025	31
2026	14
2027	13
Thereafter	30
Total	$ 340
Weighted-Average Amortization Period (in years)	4 years
In-Place Lease Valuation
Intangible Lease Assets
2023	$ 29,520
2024	22,076
2025	16,680
2026	13,146
2027	10,426
Thereafter	22,192
Total	$ 114,040
Weighted-Average Amortization Period (in years)	6 years

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	$ 4,000	$ 4,553	$ 0
Additions/Reversals as Decrease/(Increase) to Revenue	(3,000)	35	8,734
Write-offs	0	(588)	(4,181)
Balance at End of Period	$ 1,000	$ 4,000	$ 4,553

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) ft²
Asset Acquisition [Line Items]
Area of real estate property (in sq ft) | ft²	16,700,000
$197 Million Fixed Rate Mortgage | Secured Debt
Asset Acquisition [Line Items]
Debt instrument, face amount	$ 197,000,000
Stated rate (percentage)	4.10%
$200 Million Unsecured 2022 Term Loan Facility | Unsecured Debt
Asset Acquisition [Line Items]
Debt instrument, face amount	$ 200,000,000
Unsecured 600 Million 2022 Line Of Credit | Unsecured Debt | Line of Credit
Asset Acquisition [Line Items]
Debt instrument, face amount	$ 600,000,000
1180 Peachtree Street
Asset Acquisition [Line Items]
Ownership interest	100%
Area of real estate property (in sq ft) | ft²	691,092
Percentage leased	95%
Net contractual purchase price	$ 465,700,000
Asset acquisition, consideration transferred, transaction cost	$ 2,200,000

Acquisitions - Purchase Price A

Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 10, 2022	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Land		$ 567,244	$ 529,941
1180 Peachtree Street
Business Acquisition [Line Items]
Land		56,932
Building and improvements		336,228
Intangible lease assets		53,426
Lease acquisition costs, net of tenant credits received from seller		(4,071)
Intangible lease origination costs		56,748
Intangible lease liabilities		(31,355)
Total allocated purchase price		467,908
Assumption of secured mortgage note		(197,000)
Net cash paid upon acquisition		$ 270,908
Acquired intangible assets, remaining amortization period	7 years 4 months 24 days

Debt - Additional Information (

Debt - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) extension	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Schedule of Debt Instruments [Line Items]
Weighted average interest rate	3.89%	2.93%
Interest paid	$ 66,100,000	$ 49,400,000	$ 50,700,000
Interest capitalized	$ 4,200,000	$ 3,700,000	$ 1,000,000
Unsecured Debt
Schedule of Debt Instruments [Line Items]
Weighted average interest rate	3.87%
$197 Million Fixed Rate Mortgage | Secured Debt
Schedule of Debt Instruments [Line Items]
Debt instrument, face amount	$ 197,000,000
Debt instrument term	6 years
Interest rate	4.10%
$200 Million Unsecured 2022 Term Loan Facility | Unsecured Debt
Schedule of Debt Instruments [Line Items]
Debt instrument, face amount	$ 200,000,000
Maturity extension period	6 months
$200 Million Unsecured 2022 Term Loan Facility | Unsecured Debt | Secured Overnight Financing Rate (SOFR)
Schedule of Debt Instruments [Line Items]
Spread on variable rate	1%
$200 Million Unsecured 2022 Term Loan Facility | Unsecured Debt | Minimum | Secured Overnight Financing Rate (SOFR)
Schedule of Debt Instruments [Line Items]
Spread on variable rate	0.80%
$200 Million Unsecured 2022 Term Loan Facility | Unsecured Debt | Maximum | Secured Overnight Financing Rate (SOFR)
Schedule of Debt Instruments [Line Items]
Spread on variable rate	1.65%
$500 Million Unsecured 2018 Line of Credit | Unsecured Debt | Line of Credit
Schedule of Debt Instruments [Line Items]
Debt instrument, face amount	$ 500,000,000
Maturity extension period	6 months
Maximum extension period (in years)	1 year
Unsecured 600 Million 2022 Line Of Credit | Unsecured Debt | Line of Credit
Schedule of Debt Instruments [Line Items]
Debt instrument, face amount	$ 600,000,000
Maturity extension period	6 months
Number of extension periods | extension	2
Maximum extension period (in years)	1 year
Optional increase to maximum borrowing capacity	$ 500,000,000
Maximum borrowing capacity, after optional increase	$ 1,100,000,000
Unsecured 600 Million 2022 Line Of Credit | Unsecured Debt | Secured Overnight Financing Rate (SOFR) | Line of Credit
Schedule of Debt Instruments [Line Items]
Spread on variable rate	1%
Interest rate during period	1 month
Interest rate period, tranche one	1 month
Interest rate period, tranche two	3 months
Interest rate period, tranche three	6 months
Unsecured 600 Million 2022 Line Of Credit | Unsecured Debt | Federal Funds Effective Swap Rate | Line of Credit
Schedule of Debt Instruments [Line Items]
Spread on variable rate	0.50%
Unsecured 600 Million 2022 Line Of Credit | Unsecured Debt | Adjusted SOFR | Line of Credit
Schedule of Debt Instruments [Line Items]
Spread on variable rate	0.85%
Unsecured 600 Million 2022 Line Of Credit | Unsecured Debt | Minimum | Secured Overnight Financing Rate (SOFR) | Line of Credit
Schedule of Debt Instruments [Line Items]
Spread on variable rate	0.725%
Unsecured 600 Million 2022 Line Of Credit | Unsecured Debt | Maximum | Secured Overnight Financing Rate (SOFR) | Line of Credit
Schedule of Debt Instruments [Line Items]
Spread on variable rate	1.40%

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) extension	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Subtotal/weighted average	3.89%	2.93%
Amount outstanding	$ 1,997,000,000
Total/Weighted Average	1,983,681,000	$ 1,877,790,000
Secured Debt
Debt Instrument [Line Items]
Total/Weighted Average	197,000,000	0
Secured Debt | $197 Million Fixed Rate Mortgage
Debt Instrument [Line Items]
Debt instrument, face amount	$ 197,000,000
Stated rate (percentage)	4.10%
Amount outstanding	$ 197,000,000	0
Unsecured Debt
Debt Instrument [Line Items]
Subtotal/weighted average	3.87%
Net premium and unamortized debt issuance costs	$ (13,319,000)	(12,210,000)
Total/Weighted Average	1,786,681,000	1,877,790,000
Unsecured Debt | $350 Million Unsecured Senior Notes due 2023
Debt Instrument [Line Items]
Debt instrument, face amount	$ 350,000,000
Stated rate (percentage)	3.40%
Effective rate	3.43%
Amount outstanding	$ 350,000,000	350,000,000
Unsecured Debt | $200 Million Unsecured 2022 Term Loan Facility
Debt Instrument [Line Items]
Debt instrument, face amount	$ 200,000,000
Effective rate	5.42%
Amount outstanding	$ 200,000,000	0
Maturity extension period	6 months
Unsecured Debt | $200 Million Unsecured 2022 Term Loan Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Spread on variable rate	1%
Unsecured Debt | $400 Million Unsecured Senior Notes due 2024
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,000,000
Stated rate (percentage)	4.45%
Effective rate	4.10%
Amount outstanding	$ 400,000,000	400,000,000
Unsecured Debt | $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount	$ 250,000,000
Effective rate	4.54%
Amount outstanding	$ 250,000,000	250,000,000
Unsecured Debt | $250 Million Unsecured 2018 Term Loan | LIBOR
Debt Instrument [Line Items]
Spread on variable rate	0.95%
Unsecured Debt | Unsecured 600 Million 2022 Line Of Credit | Line of Credit
Debt Instrument [Line Items]
Debt instrument, face amount	$ 600,000,000
Effective rate	0%
Amount outstanding	$ 0	290,000,000
Additional extension period	1 year
Maturity extension period	6 months
Unsecured Debt | Unsecured 600 Million 2022 Line Of Credit | Line of Credit | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Spread on variable rate	1%
Unsecured Debt | Unsecured 600 Million 2022 Line Of Credit | Line of Credit | Adjusted SOFR
Debt Instrument [Line Items]
Spread on variable rate	0.85%
Unsecured Debt | $300 Million Unsecured Senior Notes due 2030
Debt Instrument [Line Items]
Debt instrument, face amount			$ 300,000,000
Stated rate (percentage)	3.15%
Effective rate	3.90%
Amount outstanding	$ 300,000,000	300,000,000
Unsecured Debt | $300 Million Unsecured Senior Notes due 2032
Debt Instrument [Line Items]
Debt instrument, face amount		300,000,000
Stated rate (percentage)	2.75%
Effective rate	2.78%
Amount outstanding	$ 300,000,000	$ 300,000,000
Unsecured Debt | Unsecured Senior $215 Million Notes
Debt Instrument [Line Items]
Debt instrument, face amount	215,000,000
Unsecured Debt | $500 Million Unsecured 2018 Line of Credit | Line of Credit
Debt Instrument [Line Items]
Debt instrument, face amount	$ 500,000,000
Additional extension period	1 year
Number of extension periods | extension	2
Maturity extension period	6 months
Unsecured Debt | $500 Million Unsecured 2018 Line of Credit | Line of Credit | LIBOR
Debt Instrument [Line Items]
Spread on variable rate	0.90%

Debt - Maturities of Long-term

Debt - Maturities of Long-term Debt (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Debt Disclosure [Abstract]
2023	$ 350,000
2024	600,000
2025	250,000
2026	0
2027	0
Thereafter	797,000
Total	$ 1,997,000

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) derivative_contract	Dec. 31, 2021 USD ($) derivative_contract	Dec. 31, 2020 USD ($) derivative_contract
Derivative [Line Items]
Maximum length of time of cash flow hedge	27 months
Gain (loss) to be reclassified	$ 2,800,000
Interest rate swaps
Derivative [Line Items]
Number of swap agreements | derivative_contract	8
Number of interest rate derivatives entered into | derivative_contract	6
Derivative, notional amount	$ 25,000,000
Forward Starting Interest Rate Swaps
Derivative [Line Items]
Number of swap agreements | derivative_contract		1	4
Derivative, notional amount		$ 50,000,000	$ 200,000,000
Settlement resulted in a gain		$ 600,000
Gain and loss on settlement of interest rate swap agreement, amortization period		10 years	10 years
Settlement resulted in a loss			$ 19,900,000
Unsecured Debt
Derivative [Line Items]
Derivative, notional amount	250,000,000
Unsecured Debt | $250 Million Unsecured 2018 Term Loan
Derivative [Line Items]
Debt instrument, face amount	$ 250,000,000
Unsecured Debt | $300 Million Unsecured Senior Notes due 2032
Derivative [Line Items]
Debt instrument, face amount		$ 300,000,000
Unsecured Debt | $300 Million Unsecured Senior Notes due 2030
Derivative [Line Items]
Debt instrument, face amount			$ 300,000,000

Derivative Instruments - Schedu

Derivative Instruments - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - Unsecured Debt	Dec. 31, 2022 USD ($) derivative_contract
Derivative [Line Items]
Derivative, notional amount	$ 250,000,000
$250 Million Unsecured 2018 Term Loan
Derivative [Line Items]
Debt instrument, face amount	$ 250,000,000
$250 Million Unsecured 2018 Term Loan | Interest Rate Swap, Tranche 1
Derivative [Line Items]
Number of swap agreements | derivative_contract	2
Derivative, notional amount	$ 100,000,000
$250 Million Unsecured 2018 Term Loan | Interest Rate Swap, Tranche 2
Derivative [Line Items]
Number of swap agreements | derivative_contract	3
Derivative, notional amount	$ 75,000,000
$250 Million Unsecured 2018 Term Loan | Interest Rate Swap, Tranche 3
Derivative [Line Items]
Number of swap agreements | derivative_contract	3
Derivative, notional amount	$ 75,000,000

Derivative Instruments - Sche_2

Derivative Instruments - Schedule of Interest Rate Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross derivative assets	$ 4,183	$ 0
Gross derivative liabilities	0	(4,924)
Net derivative liability	$ 4,183	$ (4,924)

Derivative Instruments - Effect

Derivative Instruments - Effect on other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI	$ 8,202	$ 2,994	$ (26,794)
Total amount of Interest Expense presented in the consolidated statements of operations	(65,656)	(51,292)	(54,990)
Total amount of Loss on Extinguishment of Debt presented in the consolidated statements of operations	0	0	(9,336)
Interest rate swaps
Derivative [Line Items]
Amount of gain/(loss) recognized in OCI	8,202	2,994	(26,794)
Amount of previously recorded gain/(loss) reclassified from OCI into Interest Expense	(1,273)	(2,952)	(1,727)
Total amount of Interest Expense presented in the consolidated statements of operations	(65,656)	(51,292)	(54,990)
Total amount of Loss on Extinguishment of Debt presented in the consolidated statements of operations	$ 0	$ 0	$ (9,336)

Fair Value Measurements of Fi_3

Fair Value Measurements of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross derivative assets	$ 4,183	$ 0
Interest rate swaps	0	4,924
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	16,536	7,419
Tenant receivables, net	4,762	2,995
Notes receivable	0	118,500
Restricted cash and escrows	3,064	1,441
Accounts payable and accrued expenses	63,225	45,065
Debt, net	1,983,681	1,877,790
Carrying Value | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross derivative assets	4,183	0
Interest rate swaps	0	4,924
Estimated Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	16,536	7,419
Tenant receivables, net	4,762	2,995
Restricted cash and escrows	3,064	1,441
Accounts payable and accrued expenses	63,225	45,065
Estimated Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable	0	120,075
Debt, net	1,825,723	1,938,563
Estimated Fair Value | Level 2 | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross derivative assets	4,183	0
Interest rate swaps	$ 0	$ 4,924

Impairment Loss on Real Estat_3

Impairment Loss on Real Estate Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment losses		$ 25,981	$ 41,000	$ 0
Disposal Group, Held-for-sale, Not Discontinued Operations
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment losses		10,000	41,000	0
Disposal Group, Held-for-sale, Not Discontinued Operations | 9320 Excelsior Boulevard
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment losses	$ 0	10,000	0
Disposal Group, Held-for-sale, Not Discontinued Operations | Two Pierce Place
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment losses		$ 0	$ 41,000	$ 0

Related Party Transactions (Det

Related Party Transactions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Related Party Transactions [Abstract]
Related party consulting agreement expense recognized	$ 0.1

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Compensation expense and directors' fees related to stock awards	$ 8.8	$ 11	$ 9.7
Compensation expense, non-vested awards	$ 7.7	$ 9.7	$ 8.5
Total shares issued to employees, directors, and officers (in shares)	362,863
Nonvested awards, total compensation cost not yet recognized	$ 5.5
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
Independent Director Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year

Stock Based Compensation - Roll

Stock Based Compensation - Rollforward of Stock Awards (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Rollforward of deferred stock award activity
Unvested and Potential Stock Awards as of end of the year (in shares)	729,424
Stock Awards
Rollforward of deferred stock award activity
Unvested and Potential Stock Awards as of the beginning of the year (in shares)	1,099,181
Unvested and Potential Stock Awards as of end of the year (in shares)	729,424	1,099,181
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)	$ 23.97
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)	$ 19.21	$ 23.97
Deferred Stock Award
Rollforward of deferred stock award activity
Stock Awards Granted (in shares)	311,050
Stock awards vested (in shares)	(296,229)
Deferred stock awards forfeited (in shares)	(9,457)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Stock awards granted, weighted-average grant date fair (in dollars per share)	$ 16.30	$ 17.24	$ 22.39
Stock awards vested (in dollars per share)	19.02
Stock Awards Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	$ 17.94
Performance Share Awards
Rollforward of deferred stock award activity
Change in estimated potential share award based on TSR performance (in shares)	(74,487)
Stock awards vested (in shares)	(300,634)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Change in estimated potential share award based on TSR performance (in dollars per share)	$ 21.84
Stock awards vested (in dollars per share)	$ 28.80

Stock Based Compensation - Ad_2

Stock Based Compensation - Additional Information Regarding Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant Date Fair Value per share of Deferred Stock Granted During the Period (in dollars per share)	$ 16.30	$ 17.24	$ 22.39
Total Grant Date Fair Value of Deferred Stock Vested During the Period	$ 6,414	$ 5,242	$ 4,826
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Liability Awards Paid During the Period	$ 5,481	$ 3,610	$ 4,116

Stock Based Compensation - Outs

Stock Based Compensation - Outstanding Employee Stock Awards (Details) - $ / shares							12 Months Ended
	May 11, 2022	Feb. 10, 2022	Feb. 17, 2021	Feb. 19, 2020	Jul. 01, 2019	May 03, 2019	Dec. 31, 2022	Feb. 17, 2022	Feb. 18, 2021	Mar. 19, 2020	Feb. 19, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested shares (in shares)							729,424
Award vesting period							3 years
Chief Executive Officer Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					5 years
Deferred Stock Award, Granted May 3, 2019 | Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net shares granted (in shares)						30,958
Grant date fair value (in dollars per share)						$ 21.04
Unvested shares (in shares)							19,011
Deferred Stock Award, Granted May 3, 2019 | Deferred Stock Award | Year 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage						20%
Deferred Stock Award, Granted May 3, 2019 | Deferred Stock Award | Year 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage						20%
Deferred Stock Award, Granted May 3, 2019 | Deferred Stock Award | Year 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage						20%
Deferred Stock Award, Granted May 3, 2019 | Deferred Stock Award | Year 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage						20%
Deferred Stock Award, Granted May 3, 2019 | Deferred Stock Award | Share-based Compensation Award, Tranche Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage						20%
Deferred Stock Award, Granted February 19, 2020 | Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net shares granted (in shares)											141,018
Grant date fair value (in dollars per share)											$ 24.41
Unvested shares (in shares)							37,691
Deferred Stock Award, Granted February 19, 2020 | Deferred Stock Award | Year 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				25%
Deferred Stock Award, Granted February 19, 2020 | Deferred Stock Award | Year 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				25%
Deferred Stock Award, Granted February 19, 2020 | Deferred Stock Award | Year 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				25%
Deferred Stock Award, Granted February 19, 2020 | Deferred Stock Award | Year 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				25%
Performance Share Program Award, Granted March 19, 2020 | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net shares granted (in shares)										0
Grant date fair value (in dollars per share)										$ 25.83
Unvested shares (in shares)							90,063
Deferred Stock Award, Granted February 17, 2021 | Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net shares granted (in shares)			236,388
Grant date fair value (in dollars per share)			$ 17.15
Unvested shares (in shares)							117,647
Deferred Stock Award, Granted February 17, 2021 | Deferred Stock Award | Year 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			25%
Deferred Stock Award, Granted February 17, 2021 | Deferred Stock Award | Year 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			25%
Deferred Stock Award, Granted February 17, 2021 | Deferred Stock Award | Year 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			25%
Deferred Stock Award, Granted February 17, 2021 | Deferred Stock Award | Year 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			25%
Performance Share Program Award, Granted February 18, 2021 | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net shares granted (in shares)									0
Grant date fair value (in dollars per share)									$ 23.04
Unvested shares (in shares)							77,394
Deferred Stock Award, Granted February 10, 2022 | Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net shares granted (in shares)		227,436
Grant date fair value (in dollars per share)		$ 16.85
Unvested shares (in shares)							172,306
Deferred Stock Award, Granted February 10, 2022 | Deferred Stock Award | Year 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25%
Deferred Stock Award, Granted February 10, 2022 | Deferred Stock Award | Year 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25%
Deferred Stock Award, Granted February 10, 2022 | Deferred Stock Award | Year 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25%
Deferred Stock Award, Granted February 10, 2022 | Deferred Stock Award | Year 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25%
Performance Share Program Award, Granted February 17, 2022 | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net shares granted (in shares)								0
Grant date fair value (in dollars per share)								$ 17.77
Unvested shares (in shares)							162,550
Deferred Stock Award-Board of Directors, Granted May 11, 2022 | Deferred Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net shares granted (in shares)	52,762
Grant date fair value (in dollars per share)	$ 13.61
Unvested shares (in shares)							52,762
Deferred Stock Award-Board of Directors, Granted May 11, 2022 | Deferred Stock Award | Year 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	100%

Earnings Per Share (Details)

Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Anti-dilutive shares excluded (in shares)	421,005	1,114,025	289,681
Weighted-average common shares outstanding - basic (in shares)	123,351,187	123,977,616	125,730,460
Plus: Incremental weighted-average shares from time-vested deferred and performance stock awards (in shares)	173,000	0	374,000
Weighted-average common shares outstanding - diluted (in shares)	123,523,881	123,977,616	126,104,321

Operating Leases - Rental Incom

Operating Leases - Rental Income Maturity (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Leases [Abstract]
2023	$ 427,890
2024	406,853
2025	364,400
2026	318,914
2027	275,993
Thereafter	1,049,204
Total	$ 2,843,254

Operating Leases - Operating In

Operating Leases - Operating Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Fixed payments	$ 451,403	$ 427,174	$ 433,841
Variable payments	94,338	87,445	86,112
Total Rental and Tenant Reimbursement Revenue	$ 545,741	$ 514,619	$ 519,953

Operating Leases - Additional I

Operating Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Prepaid expenses and other assets	Prepaid expenses and other assets
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accounts payable, accrued expenses, and accrued capital expenditures	Accounts payable, accrued expenses, and accrued capital expenditures
Lease liability	$ 0.2	$ 0.1
Right-of-use asset	0.2	0.1
Operating lease cost	$ 0.1	$ 0.1
Operating lease, weighted average remaining lease term	2 years
Weighted-average discount rate	3.86%

Property Dispositions and Ass_3

Property Dispositions and Assets Held for Sale - Property Dispositions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) note	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales Proceeds	$ 297,388	$ 0	$ 360,094
Number of Financing Receivable Notes Collected | note	2
Secured Notes Receivable | Real Estate Loan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Collection of Finance Receivables	$ 118,500
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets	(1,800)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 1901 Market Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets	191,030
Net Sales Proceeds	350,805
Disposal Group, Disposed of by Sale, Not Discontinued Operations | New Jersey Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets	14,636
Net Sales Proceeds	9,289
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Two Pierce Place
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets	1,741
Net Sales Proceeds	24,272
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 225 and 235 Presidential Way
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets	49,218
Net Sales Proceeds	119,609
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Cambridge Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets	102,570
Net Sales Proceeds	$ 155,307

Property Dispositions and Ass_4

Property Dispositions and Assets Held for Sale - Assets Held-for-Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total other assets held for sale, net	$ 0	$ 8,393
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		63,887
Straight-line rent receivables		2,966
Deferred lease costs, less accumulated amortization of $996 as of December 31, 2021		5,427
Accumulated amortization on deferred lease costs		996
Total other assets held for sale, net		8,393
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:		7,750
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:		55,110
Accumulated depreciation, real estate assets held for sale		16,699
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:		$ 1,027

Supplemental Disclosures for _3

Supplemental Disclosures for the Statement of Consolidated Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Accrued capital expenditures and deferred lease costs	$ 24,379	$ 24,817	$ 20,103
Change in accrued dividends	(691)	(365)	(744)
Change in accrued share repurchases as part of an announced plan	0	(685)	685
Notes receivable issued in conjunction with property dispositions	0	0	118,500
Accrued deferred financing costs	44	0	0
Cash and cash equivalents	16,536	7,419	7,331	$ 13,545
Restricted cash and escrows	3,064	1,441	1,883	1,841
Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows	$ 19,600	$ 8,860	$ 9,214	$ 15,386

Income Taxes (Details)

Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
GAAP basis financial statement net income/(loss)	$ 146,830,000	$ (1,153,000)	$ 232,688,000
Depreciation and amortization expense recognized for financial reporting purposes in excess of amounts recognized for income tax purposes	96,694,000	75,969,000	73,784,000
Rental income accrued for income tax purposes less than amounts for financial reporting purposes	(26,211,000)	(18,798,000)	(25,726,000)
Net amortization of above/below-market lease intangibles for income tax purposes in excess of amounts for financial reporting purposes	(13,022,000)	(9,465,000)	(11,625,000)
Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes	(137,871,000)	0	(222,037,000)
Other expenses, including impairment loss on real estate assets, for financial reporting purposes in excess of amounts for income tax purposes	30,310,000	51,095,000	10,970,000
Income tax basis net income, prior to dividends paid deduction	$ 99,841,000	$ 100,512,000	$ 60,898,000
Ordinary income	82.85%	96.34%	91.91%
Return of capital	3.79%	3.66%	8.09%
Capital gains	13.36%	0%	0%
Common stock dividends, percent	100%	100%	100%
Accrued interest and penalties related to uncertain tax positions	$ 0	$ 0
Recovery of previously recognized interest and penalties related to taxes	0	0	$ 1,000,000
Piedmont Washington Properties, Inc
Income Taxes [Line Items]
Taxable income for subsidiary in excess of/(less than) amount for financial reporting purposes	3,111,000	3,518,000	1,345,000
Piedmont Office Holdings, Inc
Income Taxes [Line Items]
Taxable income for subsidiary in excess of/(less than) amount for financial reporting purposes	$ 0	$ (654,000)	$ 1,499,000

Segment Information - Additiona

Segment Information - Additional Information (Details)	Dec. 31, 2022 property
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of real estate properties	4
Other Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of real estate properties	2
Other Segments | Houston
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of real estate properties	2

Segment Information - Revenue b

Segment Information - Revenue by Geographical Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 563,766	$ 528,710	$ 535,024
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	539,196	503,453	504,406
Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	24,570	25,257	30,618
Atlanta | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	131,230	98,330	95,403
Dallas | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	109,298	110,729	101,727
Washington, D.C./Northern Virginia | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	63,534	60,329	59,760
Minneapolis | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	61,530	61,563	61,465
Boston | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	59,212	65,445	61,338
Orlando | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	58,203	54,603	54,886
New York | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 56,189	$ 52,454	$ 69,827

Segment Information - NOI by Ge

Segment Information - NOI by Geographical Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net operating income	$ 337,567	$ 317,627	$ 319,459
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net operating income	322,882	307,464	305,544
Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net operating income	14,685	10,163	13,915
Atlanta | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net operating income	82,878	62,772	60,276
Dallas | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net operating income	62,444	66,155	59,845
Washington, D.C./Northern Virginia | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net operating income	39,994	36,914	36,696
Boston | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net operating income	39,101	45,587	41,722
Orlando | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net operating income	35,327	33,449	34,427
Minneapolis | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net operating income	31,886	32,538	33,588
New York | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net operating income	$ 31,252	$ 30,049	$ 38,990

Segment Information - Reconcili

Segment Information - Reconciliation of GAAP Net Income to NOI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting [Abstract]
Net income/(loss) applicable to Piedmont	$ 146,830	$ (1,153)	$ 232,688
Management fee revenue	(1,004)	(1,269)	(1,495)
Depreciation and amortization	224,553	206,608	203,869
Impairment losses	25,981	41,000	0
General and administrative	29,127	30,252	27,464
Interest expense	65,656	51,292	54,990
Other income	(1,847)	(9,089)	(1,724)
Loss on extinguishment of debt	0	0	9,336
Gain on sale of real estate assets	(151,729)	0	(205,666)
Net loss applicable to noncontrolling interests	0	(14)	(3)
NOI	$ 337,567	$ 317,627	$ 319,459

Subsequent Events (Details)

Subsequent Events (Details) - USD ($)		1 Months Ended	12 Months Ended
	Feb. 01, 2023	Jan. 31, 2023	Dec. 31, 2022
Unsecured Senior $215 Million Notes | Unsecured Debt
Subsequent Event [Line Items]
Debt instrument, face amount			$ 215,000,000
Unsecured 600 Million 2022 Line Of Credit | Line of Credit | Unsecured Debt
Subsequent Event [Line Items]
Debt instrument, face amount			$ 600,000,000
Unsecured 600 Million 2022 Line Of Credit | Secured Overnight Financing Rate (SOFR) | Line of Credit | Unsecured Debt
Subsequent Event [Line Items]
Spread on variable rate			1%
Unsecured Senior $350 Million Notes Due 2023 | Unsecured Debt
Subsequent Event [Line Items]
Debt instrument, face amount			$ 350,000,000
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.21
Subsequent Event | Unsecured Senior $215 Million Notes | Unsecured Debt
Subsequent Event [Line Items]
Debt instrument, face amount		$ 215,000,000
Extension option period		1 year
Subsequent Event | Unsecured Senior $215 Million Notes | Secured Overnight Financing Rate (SOFR)
Subsequent Event [Line Items]
Spread on variable rate		1.05%

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Real Estate and Accumulated Depreciation [Line Items]
Gross Amount at Which Carried, Total	$ 4,506,328	$ 4,206,993	$ 3,891,426
Accumulated Depreciation and Amortization	1,005,704	961,682	835,392
Tax basis of total assets	3,900,000
Impairment losses	25,981	41,000	0
Real Estate:
Balance at the beginning of the year	4,206,993	3,891,426	3,818,287
Additions to/improvements of real estate	565,552	379,516	493,760
Assets disposed	(214,728)	0	(393,231)
Assets impaired	(10,000)	(41,000)	0
Write-offs of intangible assets	(26,430)	(13,646)	(15,891)
Write-offs of fully depreciated/amortized assets	(15,059)	(9,303)	(11,499)
Balance at the end of the year	4,506,328	4,206,993	3,891,426
Accumulated Depreciation and Amortization:
Balance at the beginning of the year	961,682	835,392	875,777
Depreciation and amortization	166,234	149,239	142,762
Assets disposed	(80,723)	0	(155,757)
Write-offs of intangible assets	(26,430)	(13,646)	(15,891)
Write-offs of fully depreciated/amortized assets	(15,059)	(9,303)	(11,499)
Balance at the end of the year	$ 1,005,704	961,682	$ 835,392
Buildings
Real Estate and Accumulated Depreciation [Line Items]
Useful life	40 years
Wholly Owned Properties
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost, Land	$ 546,496
Initial Cost, Buildings and Improvements	3,436,705
Initial Cost, Total	3,983,201
Costs Capitalized Subsequent to Acquisition	523,127
Gross Amount at Which Carried, Land	567,244
Gross Amount at Which Carried, Buildings and Improvements	3,939,084
Gross Amount at Which Carried, Total	4,506,328
Accumulated Depreciation and Amortization	1,005,704
Real Estate:
Balance at the end of the year	4,506,328
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 1,005,704
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%
Initial Cost, Land	$ 7,100
Initial Cost, Buildings and Improvements	37,915
Initial Cost, Total	45,015
Costs Capitalized Subsequent to Acquisition	7,248
Gross Amount at Which Carried, Land	5,506
Gross Amount at Which Carried, Buildings and Improvements	46,757
Gross Amount at Which Carried, Total	52,263
Accumulated Depreciation and Amortization	24,647
Real Estate:
Balance at the end of the year	52,263
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 24,647
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%
Initial Cost, Land	$ 7,700
Initial Cost, Buildings and Improvements	45,154
Initial Cost, Total	52,854
Costs Capitalized Subsequent to Acquisition	12,887
Gross Amount at Which Carried, Land	8,021
Gross Amount at Which Carried, Buildings and Improvements	57,720
Gross Amount at Which Carried, Total	65,741
Accumulated Depreciation and Amortization	30,950
Real Estate:
Balance at the end of the year	65,741
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 30,950
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%
Initial Cost, Land	$ 3,642
Initial Cost, Buildings and Improvements	29,497
Initial Cost, Total	33,139
Costs Capitalized Subsequent to Acquisition	3,408
Gross Amount at Which Carried, Land	3,642
Gross Amount at Which Carried, Buildings and Improvements	32,905
Gross Amount at Which Carried, Total	36,547
Accumulated Depreciation and Amortization	16,649
Real Estate:
Balance at the end of the year	36,547
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 16,649
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%
Initial Cost, Land	$ 3,157
Initial Cost, Buildings and Improvements	43,656
Initial Cost, Total	46,813
Costs Capitalized Subsequent to Acquisition	9,664
Gross Amount at Which Carried, Land	3,157
Gross Amount at Which Carried, Buildings and Improvements	53,320
Gross Amount at Which Carried, Total	56,477
Accumulated Depreciation and Amortization	25,236
Real Estate:
Balance at the end of the year	56,477
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 25,236
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%
Initial Cost, Land	$ 3,157
Initial Cost, Buildings and Improvements	42,662
Initial Cost, Total	45,819
Costs Capitalized Subsequent to Acquisition	12,160
Gross Amount at Which Carried, Land	3,157
Gross Amount at Which Carried, Buildings and Improvements	54,822
Gross Amount at Which Carried, Total	57,979
Accumulated Depreciation and Amortization	29,809
Real Estate:
Balance at the end of the year	57,979
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 29,809
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%
Initial Cost, Land	$ 3,157
Initial Cost, Buildings and Improvements	29,034
Initial Cost, Total	32,191
Costs Capitalized Subsequent to Acquisition	18,524
Gross Amount at Which Carried, Land	3,157
Gross Amount at Which Carried, Buildings and Improvements	47,558
Gross Amount at Which Carried, Total	50,715
Accumulated Depreciation and Amortization	18,888
Real Estate:
Balance at the end of the year	50,715
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 18,888
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%
Initial Cost, Land	$ 11,138
Initial Cost, Buildings and Improvements	175,629
Initial Cost, Total	186,767
Costs Capitalized Subsequent to Acquisition	31,293
Gross Amount at Which Carried, Land	11,138
Gross Amount at Which Carried, Buildings and Improvements	206,922
Gross Amount at Which Carried, Total	218,060
Accumulated Depreciation and Amortization	105,153
Real Estate:
Balance at the end of the year	218,060
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 105,153
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%
Initial Cost, Land	$ 6,662
Initial Cost, Buildings and Improvements	69,031
Initial Cost, Total	75,693
Costs Capitalized Subsequent to Acquisition	(2,744)
Gross Amount at Which Carried, Land	6,662
Gross Amount at Which Carried, Buildings and Improvements	66,287
Gross Amount at Which Carried, Total	72,949
Accumulated Depreciation and Amortization	29,321
Real Estate:
Balance at the end of the year	72,949
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 29,321
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
400 VIRGINIA AVE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 22,146
Initial Cost, Buildings and Improvements	49,740
Initial Cost, Total	71,886
Costs Capitalized Subsequent to Acquisition	6,868
Gross Amount at Which Carried, Land	22,146
Gross Amount at Which Carried, Buildings and Improvements	56,608
Gross Amount at Which Carried, Total	78,754
Accumulated Depreciation and Amortization	24,751
Real Estate:
Balance at the end of the year	78,754
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 24,751
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%
Initial Cost, Land	$ 13,636
Initial Cost, Buildings and Improvements	70,918
Initial Cost, Total	84,554
Costs Capitalized Subsequent to Acquisition	18,576
Gross Amount at Which Carried, Land	13,636
Gross Amount at Which Carried, Buildings and Improvements	89,494
Gross Amount at Which Carried, Total	103,130
Accumulated Depreciation and Amortization	43,595
Real Estate:
Balance at the end of the year	103,130
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 43,595
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]
Ownership Percentage	98.10%
Initial Cost, Land	$ 21,959
Initial Cost, Buildings and Improvements	47,602
Initial Cost, Total	69,561
Costs Capitalized Subsequent to Acquisition	9,900
Gross Amount at Which Carried, Land	21,959
Gross Amount at Which Carried, Buildings and Improvements	57,502
Gross Amount at Which Carried, Total	79,461
Accumulated Depreciation and Amortization	29,964
Real Estate:
Balance at the end of the year	79,461
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 29,964
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]
Ownership Percentage	98.60%
Initial Cost, Land	$ 31,985
Initial Cost, Buildings and Improvements	63,139
Initial Cost, Total	95,124
Costs Capitalized Subsequent to Acquisition	13,236
Gross Amount at Which Carried, Land	31,985
Gross Amount at Which Carried, Buildings and Improvements	76,375
Gross Amount at Which Carried, Total	108,360
Accumulated Depreciation and Amortization	34,935
Real Estate:
Balance at the end of the year	108,360
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 34,935
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
60 BROAD STREET
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 32,522
Initial Cost, Buildings and Improvements	168,986
Initial Cost, Total	201,508
Costs Capitalized Subsequent to Acquisition	94,553
Gross Amount at Which Carried, Land	60,708
Gross Amount at Which Carried, Buildings and Improvements	235,353
Gross Amount at Which Carried, Total	296,061
Accumulated Depreciation and Amortization	77,272
Real Estate:
Balance at the end of the year	296,061
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 77,272
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
3100 CLARENDON BOULEVARD
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 11,700
Initial Cost, Buildings and Improvements	69,705
Initial Cost, Total	81,405
Costs Capitalized Subsequent to Acquisition	52,362
Gross Amount at Which Carried, Land	11,791
Gross Amount at Which Carried, Buildings and Improvements	121,976
Gross Amount at Which Carried, Total	133,767
Accumulated Depreciation and Amortization	48,497
Real Estate:
Balance at the end of the year	133,767
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 48,497
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
LAS COLINAS CORPORATE CENTER I
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 3,912
Initial Cost, Buildings and Improvements	18,830
Initial Cost, Total	22,742
Costs Capitalized Subsequent to Acquisition	(3,056)
Gross Amount at Which Carried, Land	2,543
Gross Amount at Which Carried, Buildings and Improvements	17,143
Gross Amount at Which Carried, Total	19,686
Accumulated Depreciation and Amortization	7,839
Real Estate:
Balance at the end of the year	19,686
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 7,839
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%
Initial Cost, Land	$ 4,496
Initial Cost, Buildings and Improvements	29,881
Initial Cost, Total	34,377
Costs Capitalized Subsequent to Acquisition	(826)
Gross Amount at Which Carried, Land	2,543
Gross Amount at Which Carried, Buildings and Improvements	31,008
Gross Amount at Which Carried, Total	33,551
Accumulated Depreciation and Amortization	14,532
Real Estate:
Balance at the end of the year	33,551
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 14,532
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
ONE MERIDIAN CROSSINGS
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 2,919
Initial Cost, Buildings and Improvements	24,398
Initial Cost, Total	27,317
Costs Capitalized Subsequent to Acquisition	931
Gross Amount at Which Carried, Land	2,919
Gross Amount at Which Carried, Buildings and Improvements	25,329
Gross Amount at Which Carried, Total	28,248
Accumulated Depreciation and Amortization	8,620
Real Estate:
Balance at the end of the year	28,248
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 8,620
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%
Initial Cost, Land	$ 2,661
Initial Cost, Buildings and Improvements	25,742
Initial Cost, Total	28,403
Costs Capitalized Subsequent to Acquisition	1,027
Gross Amount at Which Carried, Land	2,661
Gross Amount at Which Carried, Buildings and Improvements	26,769
Gross Amount at Which Carried, Total	29,430
Accumulated Depreciation and Amortization	8,903
Real Estate:
Balance at the end of the year	29,430
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 8,903
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%
Initial Cost, Land	$ 1,780
Initial Cost, Buildings and Improvements	11,510
Initial Cost, Total	13,290
Costs Capitalized Subsequent to Acquisition	5,193
Gross Amount at Which Carried, Land	1,780
Gross Amount at Which Carried, Buildings and Improvements	16,703
Gross Amount at Which Carried, Total	18,483
Accumulated Depreciation and Amortization	7,013
Real Estate:
Balance at the end of the year	18,483
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 7,013
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
400 TOWNPARK
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 2,570
Initial Cost, Buildings and Improvements	20,555
Initial Cost, Total	23,125
Costs Capitalized Subsequent to Acquisition	4,824
Gross Amount at Which Carried, Land	2,570
Gross Amount at Which Carried, Buildings and Improvements	25,379
Gross Amount at Which Carried, Total	27,949
Accumulated Depreciation and Amortization	9,360
Real Estate:
Balance at the end of the year	27,949
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 9,360
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%
Initial Cost, Land	$ 36,930
Initial Cost, Buildings and Improvements	129,070
Initial Cost, Total	166,000
Costs Capitalized Subsequent to Acquisition	3,364
Gross Amount at Which Carried, Land	36,930
Gross Amount at Which Carried, Buildings and Improvements	132,434
Gross Amount at Which Carried, Total	169,364
Accumulated Depreciation and Amortization	36,149
Real Estate:
Balance at the end of the year	169,364
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 36,149
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%
Initial Cost, Land	$ 7,190
Initial Cost, Buildings and Improvements	55,445
Initial Cost, Total	62,635
Costs Capitalized Subsequent to Acquisition	5,772
Gross Amount at Which Carried, Land	7,190
Gross Amount at Which Carried, Buildings and Improvements	61,217
Gross Amount at Which Carried, Total	68,407
Accumulated Depreciation and Amortization	18,590
Real Estate:
Balance at the end of the year	68,407
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 18,590
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%
Initial Cost, Land	$ 4,820
Initial Cost, Buildings and Improvements	37,767
Initial Cost, Total	42,587
Costs Capitalized Subsequent to Acquisition	4,480
Gross Amount at Which Carried, Land	4,820
Gross Amount at Which Carried, Buildings and Improvements	42,247
Gross Amount at Which Carried, Total	47,067
Accumulated Depreciation and Amortization	11,623
Real Estate:
Balance at the end of the year	47,067
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 11,623
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%
Initial Cost, Land	$ 6,640
Initial Cost, Buildings and Improvements	44,810
Initial Cost, Total	51,450
Costs Capitalized Subsequent to Acquisition	9,598
Gross Amount at Which Carried, Land	6,640
Gross Amount at Which Carried, Buildings and Improvements	54,408
Gross Amount at Which Carried, Total	61,048
Accumulated Depreciation and Amortization	12,418
Real Estate:
Balance at the end of the year	61,048
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 12,418
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%
Initial Cost, Land	$ 2,020
Initial Cost, Buildings and Improvements	10,680
Initial Cost, Total	12,700
Costs Capitalized Subsequent to Acquisition	745
Gross Amount at Which Carried, Land	2,020
Gross Amount at Which Carried, Buildings and Improvements	11,425
Gross Amount at Which Carried, Total	13,445
Accumulated Depreciation and Amortization	2,928
Real Estate:
Balance at the end of the year	13,445
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 2,928
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%
Initial Cost, Land	$ 9,560
Initial Cost, Buildings and Improvements	50,276
Initial Cost, Total	59,836
Costs Capitalized Subsequent to Acquisition	6,108
Gross Amount at Which Carried, Land	9,560
Gross Amount at Which Carried, Buildings and Improvements	56,384
Gross Amount at Which Carried, Total	65,944
Accumulated Depreciation and Amortization	12,851
Real Estate:
Balance at the end of the year	65,944
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 12,851
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%
Initial Cost, Land	$ 5,870
Initial Cost, Buildings and Improvements	66,849
Initial Cost, Total	72,719
Costs Capitalized Subsequent to Acquisition	18,665
Gross Amount at Which Carried, Land	5,870
Gross Amount at Which Carried, Buildings and Improvements	85,514
Gross Amount at Which Carried, Total	91,384
Accumulated Depreciation and Amortization	16,629
Real Estate:
Balance at the end of the year	91,384
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 16,629
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%
Initial Cost, Land	$ 2,147
Initial Cost, Buildings and Improvements	21,925
Initial Cost, Total	24,072
Costs Capitalized Subsequent to Acquisition	5,123
Gross Amount at Which Carried, Land	2,147
Gross Amount at Which Carried, Buildings and Improvements	27,048
Gross Amount at Which Carried, Total	29,195
Accumulated Depreciation and Amortization	5,609
Real Estate:
Balance at the end of the year	29,195
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 5,609
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%
Initial Cost, Land	$ 4,470
Initial Cost, Buildings and Improvements	38,048
Initial Cost, Total	42,518
Costs Capitalized Subsequent to Acquisition	7,553
Gross Amount at Which Carried, Land	4,470
Gross Amount at Which Carried, Buildings and Improvements	45,601
Gross Amount at Which Carried, Total	50,071
Accumulated Depreciation and Amortization	10,682
Real Estate:
Balance at the end of the year	50,071
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 10,682
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%
Initial Cost, Land	$ 1,980
Initial Cost, Buildings and Improvements	8,930
Initial Cost, Total	10,910
Costs Capitalized Subsequent to Acquisition	2,350
Gross Amount at Which Carried, Land	1,980
Gross Amount at Which Carried, Buildings and Improvements	11,280
Gross Amount at Which Carried, Total	13,260
Accumulated Depreciation and Amortization	2,075
Real Estate:
Balance at the end of the year	13,260
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 2,075
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%
Initial Cost, Land	$ 1,890
Initial Cost, Buildings and Improvements	60,094
Initial Cost, Total	61,984
Costs Capitalized Subsequent to Acquisition	35,319
Gross Amount at Which Carried, Land	1,890
Gross Amount at Which Carried, Buildings and Improvements	95,413
Gross Amount at Which Carried, Total	97,303
Accumulated Depreciation and Amortization	17,620
Real Estate:
Balance at the end of the year	97,303
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 17,620
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%
Initial Cost, Land	$ 11,660
Initial Cost, Buildings and Improvements	139,015
Initial Cost, Total	150,675
Costs Capitalized Subsequent to Acquisition	35,603
Gross Amount at Which Carried, Land	11,660
Gross Amount at Which Carried, Buildings and Improvements	174,618
Gross Amount at Which Carried, Total	186,278
Accumulated Depreciation and Amortization	34,010
Real Estate:
Balance at the end of the year	186,278
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 34,010
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%
Initial Cost, Land	$ 4,000
Initial Cost, Buildings and Improvements	73,554
Initial Cost, Total	77,554
Costs Capitalized Subsequent to Acquisition	8,916
Gross Amount at Which Carried, Land	4,000
Gross Amount at Which Carried, Buildings and Improvements	82,470
Gross Amount at Which Carried, Total	86,470
Accumulated Depreciation and Amortization	18,462
Real Estate:
Balance at the end of the year	86,470
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 18,462
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%
Initial Cost, Land	$ 5,960
Initial Cost, Buildings and Improvements	50,013
Initial Cost, Total	55,973
Costs Capitalized Subsequent to Acquisition	4,778
Gross Amount at Which Carried, Land	5,960
Gross Amount at Which Carried, Buildings and Improvements	54,791
Gross Amount at Which Carried, Total	60,751
Accumulated Depreciation and Amortization	11,258
Real Estate:
Balance at the end of the year	60,751
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 11,258
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%
Initial Cost, Land	$ 6,470
Initial Cost, Buildings and Improvements	77,858
Initial Cost, Total	84,328
Costs Capitalized Subsequent to Acquisition	1,191
Gross Amount at Which Carried, Land	6,470
Gross Amount at Which Carried, Buildings and Improvements	79,049
Gross Amount at Which Carried, Total	85,519
Accumulated Depreciation and Amortization	16,141
Real Estate:
Balance at the end of the year	85,519
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 16,141
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%
Initial Cost, Land	$ 4,550
Initial Cost, Buildings and Improvements	55,609
Initial Cost, Total	60,159
Costs Capitalized Subsequent to Acquisition	1,748
Gross Amount at Which Carried, Land	4,550
Gross Amount at Which Carried, Buildings and Improvements	57,357
Gross Amount at Which Carried, Total	61,907
Accumulated Depreciation and Amortization	13,095
Real Estate:
Balance at the end of the year	61,907
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 13,095
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%
Initial Cost, Land	$ 6,240
Initial Cost, Buildings and Improvements	57,124
Initial Cost, Total	63,364
Costs Capitalized Subsequent to Acquisition	2,029
Gross Amount at Which Carried, Land	6,240
Gross Amount at Which Carried, Buildings and Improvements	59,153
Gross Amount at Which Carried, Total	65,393
Accumulated Depreciation and Amortization	10,909
Real Estate:
Balance at the end of the year	65,393
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 10,909
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%
Initial Cost, Land	$ 6,470
Initial Cost, Buildings and Improvements	55,825
Initial Cost, Total	62,295
Costs Capitalized Subsequent to Acquisition	20,446
Gross Amount at Which Carried, Land	6,470
Gross Amount at Which Carried, Buildings and Improvements	76,271
Gross Amount at Which Carried, Total	82,741
Accumulated Depreciation and Amortization	14,027
Real Estate:
Balance at the end of the year	82,741
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 14,027
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%
Initial Cost, Land	$ 7,860
Initial Cost, Buildings and Improvements	36,303
Initial Cost, Total	44,163
Costs Capitalized Subsequent to Acquisition	4,017
Gross Amount at Which Carried, Land	7,860
Gross Amount at Which Carried, Buildings and Improvements	40,320
Gross Amount at Which Carried, Total	48,180
Accumulated Depreciation and Amortization	12,350
Real Estate:
Balance at the end of the year	48,180
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 12,350
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%
Initial Cost, Land	$ 4,358
Initial Cost, Buildings and Improvements	22,322
Initial Cost, Total	26,680
Costs Capitalized Subsequent to Acquisition	4,571
Gross Amount at Which Carried, Land	4,361
Gross Amount at Which Carried, Buildings and Improvements	26,890
Gross Amount at Which Carried, Total	31,251
Accumulated Depreciation and Amortization	6,407
Real Estate:
Balance at the end of the year	31,251
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 6,407
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%
Initial Cost, Land	$ 2,805
Initial Cost, Buildings and Improvements	28,119
Initial Cost, Total	30,924
Costs Capitalized Subsequent to Acquisition	0
Gross Amount at Which Carried, Land	2,805
Gross Amount at Which Carried, Buildings and Improvements	28,119
Gross Amount at Which Carried, Total	30,924
Accumulated Depreciation and Amortization	5,756
Real Estate:
Balance at the end of the year	30,924
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 5,756
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%
Initial Cost, Land	$ 3,760
Initial Cost, Buildings and Improvements	35,289
Initial Cost, Total	39,049
Costs Capitalized Subsequent to Acquisition	(10,553)
Gross Amount at Which Carried, Land	3,707
Gross Amount at Which Carried, Buildings and Improvements	24,789
Gross Amount at Which Carried, Total	28,496
Accumulated Depreciation and Amortization	8,654
Impairment losses		$ 10,000
Real Estate:
Balance at the end of the year	28,496
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 8,654
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%
Initial Cost, Land	$ 10,230
Initial Cost, Buildings and Improvements	54,787
Initial Cost, Total	65,017
Costs Capitalized Subsequent to Acquisition	7,314
Gross Amount at Which Carried, Land	10,230
Gross Amount at Which Carried, Buildings and Improvements	62,101
Gross Amount at Which Carried, Total	72,331
Accumulated Depreciation and Amortization	10,554
Real Estate:
Balance at the end of the year	72,331
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 10,554
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
GALLERIA 100
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 7,285
Initial Cost, Buildings and Improvements	72,449
Initial Cost, Total	79,734
Costs Capitalized Subsequent to Acquisition	2,592
Gross Amount at Which Carried, Land	7,285
Gross Amount at Which Carried, Buildings and Improvements	75,041
Gross Amount at Which Carried, Total	82,326
Accumulated Depreciation and Amortization	10,639
Real Estate:
Balance at the end of the year	82,326
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 10,639
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%
Initial Cost, Land	$ 5,687
Initial Cost, Buildings and Improvements	92,915
Initial Cost, Total	98,602
Costs Capitalized Subsequent to Acquisition	222
Gross Amount at Which Carried, Land	5,687
Gross Amount at Which Carried, Buildings and Improvements	93,137
Gross Amount at Which Carried, Total	98,824
Accumulated Depreciation and Amortization	9,999
Real Estate:
Balance at the end of the year	98,824
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 9,999
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%
Initial Cost, Land	$ 5,418
Initial Cost, Buildings and Improvements	81,003
Initial Cost, Total	86,421
Costs Capitalized Subsequent to Acquisition	5,281
Gross Amount at Which Carried, Land	5,418
Gross Amount at Which Carried, Buildings and Improvements	86,284
Gross Amount at Which Carried, Total	91,702
Accumulated Depreciation and Amortization	8,144
Real Estate:
Balance at the end of the year	91,702
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 8,144
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
ONE GALLERIA TOWER
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 5,286
Initial Cost, Buildings and Improvements	107,767
Initial Cost, Total	113,053
Costs Capitalized Subsequent to Acquisition	11,985
Gross Amount at Which Carried, Land	5,286
Gross Amount at Which Carried, Buildings and Improvements	119,752
Gross Amount at Which Carried, Total	125,038
Accumulated Depreciation and Amortization	17,500
Real Estate:
Balance at the end of the year	125,038
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 17,500
ONE GALLERIA TOWER | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
ONE GALLERIA TOWER | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
TWO GALLERIA TOWER
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 3,835
Initial Cost, Buildings and Improvements	109,605
Initial Cost, Total	113,440
Costs Capitalized Subsequent to Acquisition	5,330
Gross Amount at Which Carried, Land	3,836
Gross Amount at Which Carried, Buildings and Improvements	114,934
Gross Amount at Which Carried, Total	118,770
Accumulated Depreciation and Amortization	16,309
Real Estate:
Balance at the end of the year	118,770
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 16,309
TWO GALLERIA TOWER | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
TWO GALLERIA TOWER | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
THREE GALLERIA TOWER
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 6,541
Initial Cost, Buildings and Improvements	125,490
Initial Cost, Total	132,031
Costs Capitalized Subsequent to Acquisition	9,141
Gross Amount at Which Carried, Land	6,541
Gross Amount at Which Carried, Buildings and Improvements	134,631
Gross Amount at Which Carried, Total	141,172
Accumulated Depreciation and Amortization	17,539
Real Estate:
Balance at the end of the year	141,172
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 17,539
THREE GALLERIA TOWER | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
THREE GALLERIA TOWER | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
222 SOUTH ORANGE AVENUE
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 1,899
Initial Cost, Buildings and Improvements	18,417
Initial Cost, Total	20,316
Costs Capitalized Subsequent to Acquisition	3,534
Gross Amount at Which Carried, Land	1,899
Gross Amount at Which Carried, Buildings and Improvements	21,951
Gross Amount at Which Carried, Total	23,850
Accumulated Depreciation and Amortization	57
Real Estate:
Balance at the end of the year	23,850
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 57
222 SOUTH ORANGE AVENUE | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
222 SOUTH ORANGE AVENUE | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
999 PEACHTREE STREET
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 49,067
Initial Cost, Buildings and Improvements	156,109
Initial Cost, Total	205,176
Costs Capitalized Subsequent to Acquisition	6,422
Gross Amount at Which Carried, Land	49,067
Gross Amount at Which Carried, Buildings and Improvements	162,531
Gross Amount at Which Carried, Total	211,598
Accumulated Depreciation and Amortization	13,123
Real Estate:
Balance at the end of the year	211,598
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 13,123
999 PEACHTREE STREET | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
999 PEACHTREE STREET | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	40 years
1180 Peachtree Street
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	100%
Initial Cost, Land	$ 56,932
Initial Cost, Buildings and Improvements	389,654
Initial Cost, Total	446,586
Costs Capitalized Subsequent to Acquisition	(2)
Gross Amount at Which Carried, Land	56,932
Gross Amount at Which Carried, Buildings and Improvements	389,652
Gross Amount at Which Carried, Total	446,584
Accumulated Depreciation and Amortization	7,524
Real Estate:
Balance at the end of the year	446,584
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 7,524
1180 Peachtree Street | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	0 years
1180 Peachtree Street | 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%
Initial Cost, Land	$ 48,667
Initial Cost, Buildings and Improvements	0
Initial Cost, Total	48,667
Costs Capitalized Subsequent to Acquisition	3,457
Gross Amount at Which Carried, Land	45,782
Gross Amount at Which Carried, Buildings and Improvements	6,342
Gross Amount at Which Carried, Total	52,124
Accumulated Depreciation and Amortization	139
Real Estate:
Balance at the end of the year	52,124
Accumulated Depreciation and Amortization:
Balance at the end of the year	$ 139