Elme Communities (ELME) 10-K 18 Feb 20 2019 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 13, 2020	Jun. 28, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-06622
Entity Registrant Name	WASHINGTON REAL ESTATE INVESTMENT TRUST
Entity Central Index Key	0000104894
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	53-0261100
Entity Address, Address Line One	1775 EYE STREET
Entity Address, Address Line Two	NW, SUITE 1000
Entity Address, City or Town	WASHINGTON
Entity Address, State or Province	DC
Entity Address, Postal Zip Code	20006
City Area Code	202
Local Phone Number	774-3200
Title of 12(b) Security	Shares of Beneficial Interest
Trading Symbol	WRE
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
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2,125,135,478
Entity Common Stock, Shares Outstanding		82,115,352
Documents Incorporated by Reference	Portions of our definitive Proxy Statement relating to the 2020 Annual Meeting of Shareholders, to be filed with the Securities and Exchange Commission, are incorporated by reference in Part III, Items 10-14 of this Annual Report on Form 10-K as indicated herein.

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Land	$ 566,807	$ 526,572
Income producing property	2,392,415	2,055,349
Income producing property, at cost	2,959,222	2,581,921
Accumulated depreciation and amortization	(693,610)	(669,281)
Net income producing property	2,265,612	1,912,640
Properties under development or held for future development	124,193	87,231
Total real estate held for investment, net	2,389,805	1,999,871
Investment in real estate held for sale, net	57,028	203,410
Cash and cash equivalents	12,939	6,016
Restricted cash	1,812	1,624
Rents and other receivables	65,259	63,962
Prepaid expenses and other assets	95,149	123,670
Other assets related to properties sold or held for sale	6,336	18,551
Total assets	2,628,328	2,417,104
Liabilities
Notes payable, net	996,722	995,397
Mortgage notes payable, net	47,074	48,277
Line of credit	56,000	188,000
Accounts payable and other liabilities	71,136	57,946
Dividend payable	24,668	24,022
Advance rents	9,353	9,965
Tenant security deposits	10,595	9,501
Other liabilities related to properties sold or held for sale	718	15,518
Total liabilities	1,216,266	1,348,626
Shareholders’ equity
Preferred shares; $0.01 par value; 10,000 shares authorized; no shares issued or outstanding	0	0
Shares of beneficial interest, $0.01 par value; 100,000 shares authorized; 82,099 and 79,910 shares issued and outstanding, as of December 31, 2019 and December 31, 2018 respectively	821	799
Additional paid in capital	1,592,487	1,526,574
Distributions in excess of net income	(183,405)	(469,085)
Accumulated other comprehensive income	1,823	9,839
Total shareholders’ equity	1,411,726	1,068,127
Noncontrolling interests in subsidiaries	336	351
Total equity	1,412,062	1,068,478
Total liabilities and equity	$ 2,628,328	$ 2,417,104

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred shares, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred shares, authorized (in shares)	10,000,000	10,000,000
Preferred shares, issued (in shares)	0	0
Preferred shares, outstanding (in shares)	0	0
Shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Shares of beneficial interest, authorized (in shares)	100,000,000	100,000,000
Shares of beneficial interest, issued (in shares)	82,099,000	79,910,000
Shares of beneficial interest, outstanding (in shares)	82,099,000	79,910,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue
Real estate rental revenue	$ 309,180	$ 291,730	$ 280,281
Expenses
Real estate expenses	115,580	105,592	105,400
Depreciation and amortization	136,253	111,826	101,430
Real estate impairment	8,374	1,886	33,152
General and administrative expenses	24,370	22,089	22,580
Lease origination expenses	1,698	0	0
Total expenses	286,275	241,393	262,562
Other operating income
Gain on sale of real estate	59,961	2,495	24,915
Real estate operating income	82,866	52,832	42,634
Other income (expense)
Interest expense	(53,734)	(50,501)	(46,793)
Other income	0	0	507
Loss on extinguishment of debt	0	(1,178)	0
Income tax benefit	0	0	84
Total other income (expense)	(53,734)	(51,679)	(46,202)
Income (loss) from continuing operations	29,132	1,153	(3,568)
Discontinued operations:
Income from operations of properties sold or held for sale	16,158	24,477	23,180
Gain on sale of real estate	339,024	0	0
Loss on extinguishment of debt	(764)	0	0
Income from discontinued operations	354,418	24,477	23,180
Net income	383,550	25,630	19,612
Less: Net loss attributable to noncontrolling interests in subsidiaries	0	0	56
Net income attributable to the controlling interests	$ 383,550	$ 25,630	$ 19,668
Basic net income (loss) attributable to the controlling interests per share
Continuing operations, basic (in dollars per share)	$ 0.36	$ 0.01	$ (0.05)
Discontinued operations, including gain on sale of real estate, basic (in dollars per share)	4.39	0.31	0.30
Net income attributable to the controlling interests per share (in dollars per share)	4.75	0.32	0.25
Diluted net income (loss) attributable to the controlling interests per share
Continuing operations, diluted (in dollars per share)	0.36	0.01	(0.05)
Discontinued operations, including gain on sale of real estate, diluted (in dollars per share)	4.39	0.31	0.30
Net income attributable to the controlling interests per share (in dollars per share)	$ 4.75	$ 0.32	$ 0.25
Weighted average shares outstanding – basic (in shares)	80,257	78,960	76,820
Weighted average shares outstanding – diluted (in shares)	80,335	79,042	76,820

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 383,550	$ 25,630	$ 19,612
Unrealized (loss) gain on interest rate hedges	(8,016)	420	1,808
Comprehensive income	375,534	26,050	21,420
Less: Net loss attributable to noncontrolling interests	0	0	56
Comprehensive income attributable to the controlling interests	$ 375,534	$ 26,050	$ 21,476

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Shares of Beneficial Interest at Par Value	Additional Paid in Capital	Distributions in Excess of Net Income	Accumulated Other Comprehensive Income (Loss)	Total Shareholders’ Equity	Non- controlling Interests in Subsidiary
Balance (in shares) at Dec. 31, 2016		74,606
Balance at Dec. 31, 2016	$ 1,052,062	$ 746	$ 1,368,636	$ (326,047)	$ 7,611	$ 1,050,946	$ 1,116
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the controlling interests	19,668			19,668		19,668
Net loss attributable to noncontrolling interests	(56)						(56)
Unrealized gain (loss) on interest rate hedges	1,808				1,808	1,808
Distributions to noncontrolling interests	(4,199)		(3,128)			(3,128)	(1,071)
Contributions from noncontrolling interest	376						376
Dividends	$ (92,834)			(92,834)		(92,834)
Equity offerings, net of issuance costs (in shares)	3,600	3,587
Equity offerings, net of issuance costs	$ 113,194	$ 36	113,158			113,194
Shares issued under Dividend Reinvestment Program (in shares)	80	80
Shares issued under Dividend Reinvestment Program	$ 2,576	$ 1	2,575			2,576
Share grants, net of forfeitures and tax withholdings (in shares)		237
Share grants, net of forfeitures and tax withholdings	2,741	$ 2	2,739			2,741
Balance (in shares) at Dec. 31, 2017		78,510
Balance at Dec. 31, 2017	1,095,336	$ 785	1,483,980	(399,213)	9,419	1,094,971	365
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the controlling interests	25,630			25,630		25,630
Net loss attributable to noncontrolling interests	0
Unrealized gain (loss) on interest rate hedges	420				420	420
Distributions to noncontrolling interests	(14)		0			0	(14)
Dividends	$ (95,502)			(95,502)		(95,502)
Equity offerings, net of issuance costs (in shares)	1,165	1,165
Equity offerings, net of issuance costs	$ 35,472	$ 11	35,461			35,472
Shares issued under Dividend Reinvestment Program (in shares)	81	81
Shares issued under Dividend Reinvestment Program	$ 1,973	$ 1	1,972			1,973
Share grants, net of forfeitures and tax withholdings (in shares)		154
Share grants, net of forfeitures and tax withholdings	5,163	$ 2	5,161			5,163
Balance (in shares) at Dec. 31, 2018		79,910
Balance at Dec. 31, 2018	1,068,478	$ 799	1,526,574	(469,085)	9,839	1,068,127	351
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to the controlling interests	383,550			383,550		383,550
Net loss attributable to noncontrolling interests	0
Unrealized gain (loss) on interest rate hedges	(8,016)				(8,016)	(8,016)
Distributions to noncontrolling interests	(15)		0			0	(15)
Dividends	$ (96,964)			(96,964)		(96,964)
Equity offerings, net of issuance costs (in shares)	1,859	1,859
Equity offerings, net of issuance costs	$ 54,916	$ 18	54,898			54,916
Shares issued under Dividend Reinvestment Program (in shares)	173	173
Shares issued under Dividend Reinvestment Program	$ 4,755	$ 2	4,753			4,755
Share grants, net of forfeitures and tax withholdings (in shares)		157
Share grants, net of forfeitures and tax withholdings	6,264	$ 2	6,262			6,264
Balance (in shares) at Dec. 31, 2019		82,099
Balance at Dec. 31, 2019	$ 1,412,062	$ 821	$ 1,592,487	$ (183,405)	$ 1,823	$ 1,411,726	$ 336

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income	$ 383,550	$ 25,630	$ 19,612
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of real estate	(398,985)	(2,495)	(24,915)
Depreciation and amortization	141,179	121,228	112,056
Credit (gains) losses on lease related receivables	(10)	2,136	882
Deferred tax benefit	0	0	(84)
Real estate impairment	8,374	1,886	33,152
Share-based compensation expense	7,743	6,746	4,771
Amortization of debt premiums, discounts and deferred issuance costs	3,195	2,101	1,897
Loss on extinguishment of debt	764	0	0
Loss on extinguishment of debt	0	1,178	0
Changes in other assets	(10,086)	(8,674)	(20,199)
Changes in other liabilities	(4,801)	(2,367)	3,454
Net cash provided by operating activities	130,923	147,369	130,626
Cash flows from investing activities
Real estate acquisitions, net	(528,589)	(106,400)	(138,371)
Capital improvements to real estate	(68,456)	(71,070)	(60,515)
Development in progress	(47,492)	(34,806)	(18,150)
Net cash received from sale of real estate	706,064	174,297	30,798
Real estate deposits, net	0	0	(6,250)
Non-real estate capital improvements	(491)	(963)	(3,866)
Net cash provided by (used in) investing activities	61,036	(38,942)	(196,354)
Cash flows from financing activities
Line of credit (repayments) borrowings, net	(132,000)
Line of credit (repayments) borrowings, net		22,000	46,000
Principal payments – mortgage notes payable	(12,724)	(170,081)	(52,571)
Proceeds from dividend reinvestment program	4,755	1,973	2,576
Repayments of unsecured term loan debt	(450,000)	(150,000)	0
Proceeds from term loan	450,000	250,000	50,000
Payment of financing costs	(1,303)	(5,650)	(319)
Dividends paid	(96,361)	(95,059)	(91,666)
Distributions to noncontrolling interests	(15)	(14)	(4,199)
Net proceeds from equity offerings	54,916	35,472	113,194
Payment of tax withholdings for restricted share awards	(2,116)	(2,051)	(2,286)
Net cash (used in) provided by financing activities	(184,848)	(113,410)	60,729
Net increase (decrease) in cash, cash equivalents and restricted cash	7,111	(4,983)	(4,999)
Cash, cash equivalents and restricted cash at beginning of year	7,640	12,623	17,622
Cash, cash equivalents and restricted cash at end of year	14,751	7,640	12,623
Supplemental disclosure of cash flow information:
Cash paid for interest, net of capitalized interest expense	50,999	49,058	45,730
Cash paid for income taxes	0	0	17
Change in accrued capital improvements and development costs	7,908	(2,769)	3,264
Operating partnership units issued with acquisition	0	0	376
Reconciliation of cash, cash equivalents and restricted cash:
Cash, cash equivalents and restricted cash	$ 14,751	$ 12,623	$ 17,622

Nature of Business

Nature of Business	12 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	NATURE OF BUSINESS Washington Real Estate Investment Trust (“WashREIT”), a Maryland real estate investment trust, is a self-administered equity real estate investment trust, successor to a trust organized in 1960. Our business consists of the ownership and operation of income-producing real estate properties in the greater Washington D.C. metro region. We own a portfolio of multifamily and commercial properties. During 2019, we acquired eight multifamily properties with a total of 2,390 units and sold eight retail properties (see note 3 ). The eight sold retail properties met the criteria for classification as discontinued operations. The remaining retail properties do not meet the qualitative or quantitative criteria for a reportable segment (see note 14 ). The acquisitions of multifamily properties and dispositions of retail properties are part of a strategic shift away from the retail sector to the multifamily sector. This strategic shift simplifies our portfolio to two reportable segments (multifamily and office) and reduces our exposure to future retail lease expirations. U.S. Federal Income Taxes We believe that we qualify as a REIT under Sections 856-860 of the Internal Revenue Code of 1986, as amended (the "Code"), and intend to continue to qualify as such. To maintain our status as a REIT, we are, among other things, required to distribute 90% of our REIT taxable income (which is, generally, our ordinary taxable income, with certain modifications), excluding any net capital gains and any deductions for dividends paid to our shareholders on an annual basis. When selling a property, we generally have the option of (a) reinvesting the sales proceeds of property sold, in a way that allows us to defer recognition of some or all taxable gain realized on the sale, (b) distributing gains to the shareholders with no tax to us or (c) treating net long-term capital gains as having been distributed to our shareholders, paying the tax on the gain deemed distributed and allocating the tax paid as a credit to our shareholders. During the three years ended December 31, 2019 , we sold our interests in the following properties (in thousands): Disposition Date Property Type (Loss) Gain on Sale June 26, 2019 Quantico Corporate Center (1) Office $ (1,046 ) July 23, 2019 Shopping Center Portfolio (2) Retail 333,023 August 21, 2019 Frederick Crossing and Frederick County Square Retail 9,507 August 27, 2019 Centre at Hagerstown Retail (3,506 ) December 19, 2019 1776 G Street Office 61,007 Total 2019 $ 398,985 January 19, 2018 Braddock Metro Center Office $ — June 28, 2018 2445 M Street Office 2,495 Total 2018 $ 2,495 October 23, 2017 Walker House Apartments Multifamily $ 23,838 Total 2017 $ 23,838 ______________________________ (1) Consists of 925 and 1000 Corporate Drive. (2) Consists of five retail properties: Gateway Overlook, Wheaton Park, Olney Village Center, Bradlee Shopping Center and Shoppes of Foxchase. Seven of the eight retail properties sold during 2019 were identified for deferred exchanges under Section 1031 of the Code (see note 3). We acquired eight multifamily replacement properties (see note 3) during 2019. The taxable gains for 1776 G Street, a portion of the Shopping Center Portfolio proceeds not reinvested in the deferred exchange, and Walker House Apartments were distributed to shareholders through quarterly dividends in their respective year of sale. Generally, and subject to our ongoing qualification as a REIT, no provisions for income taxes are necessary except for taxes on undistributed taxable income and taxes on the income generated by our taxable REIT subsidiaries (“TRSs”). Our TRSs are subject to corporate federal and state income tax on their taxable income at regular statutory rates, or as calculated under the alternative minimum tax, as appropriate. As of both December 31, 2019 and 2018 , our TRSs had a deferred tax asset of $1.4 million that was fully reserved. As of both December 31, 2019 and 2018 , we had deferred state and local tax liabilities of $0.6 million . These deferred tax liabilities are primarily related to temporary differences in the timing of the recognition of revenue, amortization and depreciation. Beginning in 2018, ordinary taxable income per share is equal to the Section 199A dividend that was created by the TCJA. The following is a breakdown of the taxable percentage of our dividends for the years ended December 31, 2019, 2018 and 2017 (unaudited): 2019 2018 2017 Ordinary income/Section 199A dividends 80 % 29 % 76 % Return of capital 20 % 71 % — % Qualified dividends — % — % 2 % Unrecaptured Section 1250 gain — % — % 8 % Capital gain — % — % 14 %

Summary of Significant Accounti

Summary of Significant Accounting Policies and Basis of Presentation	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies and Basis of Presentation	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND BASIS OF PRESENTATION Principles of Consolidation and Basis of Presentation The accompanying audited consolidated financial statements include the consolidated accounts of WashREIT and our subsidiaries and entities in which WashREIT has a controlling financial interest. All intercompany balances and transactions have been eliminated in consolidation. We have prepared the accompanying audited consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission. Use of Estimates in the Financial Statements The preparation of financial statements in conformity with Generally Accepted Accounting Principles ("GAAP") requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Recent Accounting Standards Standards Adopted Standard/Description Effective Date and Adoption Considerations Effect on Financial Statements or Other significant Matters ASU 2016-02, Leases (Topic 842) . This standard amends existing lease accounting standards for both lessees and lessors. Lessees must classify most leases as either finance or operating leases. For lease contracts, or contracts with an embedded lease, with a duration of more than one year in which we are the lessee, the present value of future lease payments are recognized on our consolidated balance sheets as a right-of-use asset and a corresponding lease liability. Lessors Lease contracts currently classified as operating leases are accounted for similarly to prior guidance. However, lessors are required to account for each lease and non-lease component, such as common area maintenance or tenant service revenues, of a contract separately. In July 2018, the FASB issued 2018-11, Leases (Topic 842) - Targeted Improvements (“ASU 2018-11”), which provides lessors optional transition relief from implementing this aspect of ASU 2016-02 if the following criteria are met: (1) both components have the same timing and pattern of revenue and (2) if accounted for separately, both components would be classified as an operating lease. Also, under ASU 2016-02, only incremental costs or initial direct costs of executing a lease contract qualify for capitalization, while prior accounting standards allowed for the capitalization of indirect leasing costs. We adopted the new standard as of January 1, 2019. We adopted ASU 2016-02 as of January 1, 2019 using the modified retrospective approach and by applying the transitional practical expedients noted below. Under the modified retrospective approach, we recognized a cumulative effect adjustment of $0.9 million to distributions in excess of net income as of January 1, 2019 (see note 4 for further discussion of the impact of adoption on our consolidated financial statements). We did not elect the hindsight expedient, which would have allowed us to reevaluate lease terms in calculating lease liabilities as part of adoption. We elected not to bifurcate lease contracts into lease and non-lease components, since: (1) the timing and pattern of revenue is not materially different and the non-lease components are not the primary component of the lease, and (2) the lease component, if accounted for separately, would be classified as an operating lease. Accordingly, both lease and non-lease components are presented in “Real estate rental revenue” in our consolidated financial statements. The adoption of ASU 2016-02 did not result in a material change to our recognition of real estate rental revenue. New Accounting Standards Issued But Not Yet Effective Standard/Description Effective Date and Adoption Considerations Effect on Financial Statements or Other significant Matters ASU 2016-13, Measurement of Credit Losses on Financial Instruments . This standard requires financial assets measured at an amortized cost basis, including trade receivables, to be presented at the net amount expected to be collected. This standard does not apply to receivables arising from operating leases accounted for in accordance with Topic 842. We adopted the new standard as of January 1, 2020. The adoption of the new standard did not have a material impact on our consolidated financial statements. ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software . This standard requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance to determine which implementation costs to capitalize as assets. We adopted the new standard as of January 1, 2020. The adoption of the new standard did not have a material impact on our consolidated financial statements. Revenue Recognition We lease multifamily properties under operating leases with terms of generally one year or less. We lease commercial properties under operating leases with an average term of seven years . Substantially all commercial leases contain fixed escalations or, in some instances, changes based on the Consumer Price Index, which occur at specified times during the term of the lease. In certain commercial leases, variable lease income, such as percentage rent, is recognized when rents are earned. We recognize rental income and rental abatements from our multifamily and commercial leases on a straight-line basis over the lease term. Recognition of rental income commences when control of the leased space has been transferred to the tenant. We recognize gains on sales of real estate when we have executed a contract for sale of the asset, transferred controlling financial interest in the asset to the buyer and determined that it is probable that we will collect substantially all of the consideration for the asset. Our real estate sale transactions typically meet these criteria at closing. We recognize cost reimbursement income from pass-through expenses on an accrual basis over the periods in which the expenses were incurred. Pass-through expenses are comprised of real estate taxes, operating expenses and common area maintenance costs which are reimbursed by tenants in accordance with specific allowable costs per tenant lease agreements. Parking revenues are derived from leases, monthly parking agreements and transient parking. We recognize parking revenues from leases on a straight-line basis over the lease term and monthly parking revenues as earned. We recognize transient parking revenue when our performance obligation is met. Rents and Other Receivables Lease related receivables, which include contractual amounts accrued and unpaid from tenants and accrued straight-line rents receivable, are reduced for credit losses. Such amounts are recognized as a reduction to real estate rental revenues. We evaluate the collectability of lease receivables monthly using several factors including a lessee’s creditworthiness. We recognize the credit loss on lease related receivables when, in the opinion of management, collection of substantially all lease payments is not probable. When collectability is determined not probable, any lease income recognized subsequent to recognizing the credit loss is limited to the lesser of the lease income reflected on a straight-line basis or cash collected. The adoption of ASU 2016-02 resulted in an adjustment to our opening distributions in excess of net income balance of $0.9 million , associated with lease related receivables where collection of substantially all operating lease payments was not probable as of January 1, 2019. Rents and other receivables on the consolidated balance sheet is net of allowance for doubtful accounts of $2.4 million as of December 31, 2018 . Debt Issuance Costs We amortize external debt issuance costs using the effective interest rate method or the straight-line method which approximates the effective interest rate method, over the estimated life of the related debt. We record debt issuance costs related to notes and mortgage notes, net of amortization, on our consolidated balance sheets as an offset to their related debt. We record debt issuance costs related to revolving lines of credit on our consolidated balance sheets with Prepaid expenses and other assets, regardless of whether a balance on the line of credit is outstanding. We record the amortization of all debt issuance costs as interest expense. Deferred Leasing Costs We capitalize and amortize direct and incremental costs associated with the successful negotiation of leases, both external commissions and internal direct costs, on a straight-line basis over the terms of the respective leases. We record the amortization of deferred leasing costs in Depreciation and amortization on the consolidated statements of operations. If an applicable lease terminates prior to the expiration of its initial lease term, we write off the carrying amount of the costs to amortization expense. We capitalize and amortize against revenue leasing incentives associated with the successful negotiation of leases on a straight-line basis over the terms of the respective leases. We record the amortization of deferred leasing incentives as a reduction of revenue. If an applicable lease terminates prior to the expiration of its initial lease term, we write off the carrying amount of the costs as a reduction of revenue. Real Estate and Depreciation We depreciate buildings on a straight-line basis over estimated useful lives ranging from 28 to 50 years. We capitalize all capital improvements associated with replacements, improvements or major repairs to real property that extend its useful life and depreciate them using the straight-line method over their estimated useful lives ranging from 3 to 30 years. We also capitalize costs incurred in connection with our development projects, including interest incurred on borrowing obligations and other internal costs during periods in which qualifying expenditures have been made and activities necessary to get the development projects ready for their intended use are in progress. Capitalization of these costs begins when the activities and related expenditures commence and ceases when the project is substantially complete and ready for its intended use, at which time the project is placed into service and depreciation commences. In addition, we capitalize tenant leasehold improvements when certain criteria are met, including when we supervise construction and will own the improvements. We depreciate all tenant improvements over the shorter of the useful life of the improvements or the term of the related tenant lease. Real estate depreciation expense from continuing operations was $101.7 million , $82.9 million and $81.0 million during the years ended December 31, 2019 , 2018 and 2017, respectively. We charge maintenance and repair costs that do not extend an asset’s useful life to expense as incurred. Interest expense from continuing operations and interest capitalized to real estate assets related to development and major renovation activities for the three years ended December 31, 2019 were as follows (in thousands): Year Ended December 31, 2019 2018 2017 Total interest incurred $ 56,948 $ 52,592 $ 47,757 Capitalized interest (3,214 ) (2,091 ) (964 ) Interest expense, net of capitalized interest $ 53,734 $ 50,501 $ 46,793 We recognize impairment losses on long-lived assets used in operations, development assets or land held for future development, if indicators of impairment are present and the net undiscounted cash flows estimated to be generated by those assets are less than the assets' carrying amount. Estimates of undiscounted cash flows are based on forward-looking assumptions, including annual and residual cash flows and our estimated holding period for each property. Such assumptions involve a high degree of judgment and could be affected by future economic and market conditions. When determining if a property has indicators of impairment, we evaluate the property's occupancy, our expected holding period for the property, strategic decisions regarding the property's future operations or development and other market factors. If such carrying amount is in excess of the estimated undiscounted cash flows from the operation and disposal of the property, we would recognize an impairment loss equivalent to an amount required to adjust the carrying amount to its estimated fair value, calculated in accordance with current GAAP fair value provisions. Assets held for sale are recorded at the lower of cost or fair value less costs to sell. Acquisitions The properties we acquire typically are not businesses as defined by ASU 2017-01, Business Combinations (Topic 805) - Clarifying the Definition of a Business . Per this definition, a set of transferred assets and activities is not a business when substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets. We therefore account for such acquisitions as asset acquisitions. Acquisition costs are capitalized and identifiable assets (including physical assets and in-place leases), liabilities assumed and any noncontrolling interests are measured by allocating the cost of the acquisition on a relative fair value basis. Acquisitions executed prior to our adoption of ASU 2017-01 as of January 1, 2017 were accounted for as business combinations. We determine the fair values of acquired buildings on an “as-if-vacant” basis considering a variety of factors, including the replacement cost of the property, estimated rental and absorption rates, estimated future cash flows and valuation assumptions consistent with current market conditions. We determine the fair value of land acquired based on comparisons to similar properties that have been recently marketed for sale or sold. The fair value of in-place leases consists of the following components – (a) the estimated cost to us to replace the leases, including foregone rents during the period of finding a new tenant and foregone recovery of tenant pass-throughs (referred to as “absorption cost”); (b) the estimated cost of tenant improvements, and other direct costs associated with obtaining a new tenant (referred to as “tenant origination cost”); (c) estimated leasing commissions associated with obtaining a new tenant (referred to as “leasing commissions”); (d) the above/at/below market cash flow of the leases, determined by comparing the projected cash flows of the leases in place, including consideration of renewal options, to projected cash flows of comparable market-rate leases (referred to as “net lease intangible”); and (e) the value, if any, of customer relationships, determined based on our evaluation of the specific characteristics of each tenant’s lease and our overall relationship with the tenant (referred to as “customer relationship value”). We have attributed no value to customer relationships as of December 31, 2019 and 2018 . We discount the amounts used to calculate net lease intangibles using an interest rate which reflects the risks associated with the leases acquired. We classify tenant origination costs as income producing property on our consolidated balance sheets and amortize the tenant origination costs as depreciation expense on a straight-line basis over the remaining life of the underlying leases. We classify leasing commissions and absorption costs as other assets and amortize leasing commissions and absorption costs as amortization expense on a straight-line basis over the remaining life of the underlying leases. We classify net lease intangible assets as other assets and amortize them on a straight-line basis as a decrease to real estate rental revenue over the remaining term of the underlying leases. We classify net lease intangible liabilities as other liabilities and amortize them on a straight-line basis as an increase to real estate rental revenue over the remaining term of the underlying leases. If any of the fair value of below market lease intangibles includes fair value associated with a renewal option, such amounts are not amortized until the renewal option is executed, else the related value is expensed at that time. Should a tenant terminate its lease prior to the expiration date, we accelerate the amortization of the unamortized portion of the tenant origination cost, leasing commissions, absorption costs and net lease intangible associated with that lease, over its new, shorter term. Software Developed for Internal Use The costs of software developed for internal use that qualify for capitalization are included with Prepaid expenses and other assets on our consolidated balance sheets. These capitalized costs include external direct costs utilized in developing or obtaining the applications and expenses for employees who are directly associated with the development of the applications. Capitalization of such costs begins when the preliminary project stage is complete and continues until the project is substantially complete and is ready for its intended purpose. Completed projects are amortized on a straight-line basis over their estimated useful lives. Held for Sale and Discontinued Operations We classify properties as held for sale when they meet the necessary criteria, which include: (a) senior management commits to a plan to sell the assets, (b) the assets are available for immediate sale in their present condition subject only to terms that are usual and customary for sales of such assets, (c) an active program to locate a buyer and other actions required to complete the plan to sell the assets have been initiated, (d) the sale of the assets is probable, and transfer of the assets is expected to qualify for recognition as a completed sale, within one year, (e) the assets are being actively marketed for sale at a price that is reasonable in relation to its current fair value and (f) actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. Depreciation on these properties is discontinued at the time they are classified as held for sale, but operating revenues, operating expenses and interest expense continue to be recognized until the date of sale. Revenues and expenses of properties that are either sold or classified as held for sale are presented as discontinued operations for all periods presented in the consolidated statements of operations if the dispositions represent a strategic shift that has (or will have) a major effect on our operations and financial results. Interest on debt that can be identified as specifically attributed to these properties is included in discontinued operations. If the dispositions do not represent a strategic shift that has (or will have) a major effect on our operations and financial results, then the revenues and expenses of the properties that are classified as sold or held for sale are presented as continuing operations in the consolidated statements of operations for all periods presented. Segments We evaluate performance based upon net operating income from the combined properties in each segment. Our reportable operating segments are consolidations of similar properties. GAAP requires that segment disclosures present the measure(s) used by the chief operating decision maker for purposes of assessing segments’ performance. Net operating income is a key measurement of our segment profit and loss. Net operating income is defined as segment real estate rental revenue less segment real estate expenses. Cash and Cash Equivalents Cash and cash equivalents include cash and commercial paper with original maturities of 90 days or less. We maintain cash deposits with financial institutions that at times exceed applicable insurance limits. We reduce this risk by maintaining such deposits with high quality financial institutions that management believes are credit-worthy. Restricted Cash Restricted cash includes funds escrowed for tenant security deposits, real estate tax, insurance and mortgage escrows and escrow deposits required by lenders on certain of our properties to be used for future building renovations or tenant improvements. Earnings Per Common Share We determine “Basic earnings per share” using the two-class method as our unvested restricted share awards and units have non-forfeitable rights to dividends, and are therefore considered participating securities. We compute basic earnings per share by dividing net income attributable to the controlling interest less the allocation of undistributed earnings to unvested restricted share awards and units by the weighted-average number of common shares outstanding for the period. We also determine “Diluted earnings per share” under the two-class method with respect to the unvested restricted share awards. We further evaluate any other potentially dilutive securities at the end of the period and adjust the basic earnings per share calculation for the impact of those securities that are dilutive. Our dilutive earnings per share calculation includes the dilutive impact of operating partnership units under the if-converted method and our share based awards with performance conditions prior to the grant date and all market condition awards under the contingently issuable method. Stock Based Compensation We currently maintain equity based compensation plans for trustees, officers and employees. We recognize compensation expense for service-based share awards ratably over the period from the service inception date through the vesting period based on the fair market value of the shares on the date of grant. We account for forfeitures as they occur. If an award's service inception date precedes the grant date, we initially measure compensation expense for awards with performance conditions at fair value at the service inception date based on probability of payout, and we remeasure compensation expense at subsequent reporting dates until all of the award’s key terms and conditions are known and the grant date is established. We amortize awards with performance conditions using the graded expense method. We measure compensation expense for awards with market conditions based on the grant date fair value, as determined using a Monte Carlo simulation, and we amortize the expense ratably over the requisite service period, regardless of whether the market conditions are achieved and the awards ultimately vest. Compensation expense for the trustee grants, which fully vest immediately, is fully recognized upon issuance based upon the fair market value of the shares on the date of grant. Accounting for Uncertainty in Income Taxes We can recognize a tax benefit only if it is “more likely than not” that a particular tax position will be sustained upon examination or audit. To the extent that the “more likely than not” standard has been satisfied, the benefit associated with a tax position is measured as the largest amount that is greater than 50% likely of being recognized upon settlement. As of December 31, 2019 and 2018 , we did not have any unrecognized tax benefits. We do not believe that there will be any material changes to our uncertain tax positions over the next twelve months. We are subject to federal income tax as well as income tax of the states of Maryland and Virginia, and the District of Columbia. However, as a REIT, we generally are not subject to income tax on our taxable income to the extent it is distributed as dividends to our shareholders. Tax returns filed for 2015 through 2019 tax years are subject to examination by taxing authorities. We classify interest and penalties related to uncertain tax positions, if any, in our financial statements as a component of general and administrative expense. Derivatives

Real Estate

Real Estate	12 Months Ended
	Dec. 31, 2019
Real Estate [Abstract]
Real Estate	REAL ESTATE As of December 31, 2019 and 2018 , our real estate investment portfolio classified as income producing property that is held and used, at cost, consists of properties as follows (in thousands): December 31, 2019 2018 Multifamily $ 1,469,011 $ 919,285 Office 1,329,722 1,507,986 Other (1) 160,489 154,650 $ 2,959,222 $ 2,581,921 ______________________________ (1) Consists of the retail properties not classified as discontinued operations: Takoma Park, Westminster, Concord Centre, Chevy Chase Metro Plaza, 800 S. Washington Street, Randolph Shopping Center, Montrose Shopping Center and Spring Valley Village. Our results of operations are dependent on the overall economic health of our markets, tenants and the specific segments in which we own properties. All property types are affected by external economic factors, such as inflation, consumer confidence and unemployment rates, as well as changing tenant and consumer requirements. As of December 31, 2019 , no property accounted for more than approximately 10% of total assets. No single property or tenant accounted for more than 10% of the real estate rental revenue. We have properties under development/redevelopment and held for current or future development. The cost of our real estate portfolio under development or held for future development as of December 31, 2019 and 2018 is as follows (in thousands): December 31, 2019 2018 Multifamily $ 123,071 $ 83,945 Office 478 478 Other 644 2,808 $ 124,193 $ 87,231 As of December 31, 2019 , we have invested $110.4 million , including the cost of acquired land, in The Trove, a multifamily development adjacent to The Wellington. We substantially completed major construction activities for The Trove garage levels 1-5 during the third quarter of 2019 and placed into service assets totaling $12.3 million . We expect to place the remainder of Trove development cost into service during 2020. We have also invested $25.6 million , including the cost of acquired land, in a multifamily development adjacent to Riverside Apartments. In addition, there are several other projects with minor development activity in the multifamily and office segments. Acquisitions Our current strategy is to recycle legacy assets that lack the income growth potential we seek and to invest in high-quality assets with compelling value-add returns through redevelopment opportunities in our existing portfolio and acquisitions that meet our stringent investment criteria. We focus on properties inside the Washington metro region’s Beltway, near major transportation nodes and in areas with strong employment drivers and superior growth demographics. Properties and land for development acquired during the three years ended December 31, 2019 were as follows: Acquisition Date Property Type # of units (unaudited) Rentable Square Feet (unaudited) Contract Purchase Price (in thousands) April 30, 2019 Assembly Portfolio - Virginia (1) Multifamily 1,685 N/A $ 379,100 June 27, 2019 Assembly Portfolio - Maryland (2) Multifamily 428 N/A 82,070 July 23, 2019 Cascade at Landmark Multifamily 277 N/A 69,750 2,390 $ 530,920 January 18, 2018 Arlington Tower Office N/A 391,000 $ 250,000 April 4, 2017 Watergate 600 Office N/A 293,000 $ 135,000 ______________________________ (1) Consists of Assembly Alexandria, Assembly Manassas, Assembly Dulles, Assembly Leesburg, and Assembly Herndon. (2) Consists of Assembly Germantown and Assembly Watkins Mill. The Assembly Portfolio - Virginia and Assembly Portfolio - Maryland properties are collectively the “Assembly Portfolio.” The purchases of the Assembly Portfolio and Cascade at Landmark were structured as exchanges under Section 1031 of the Code in a manner such that legal title was held by a 1031 exchange facilitator (an "Exchange Accommodator") until certain identified properties were sold and the deferred exchanges were completed. We retained all of the legal and economic benefits and obligations related to the Assembly Portfolio and Cascade at Landmark. As such, the Assembly Portfolio and Cascade at Landmark were considered to be variable interest entities until legal title was transferred to us upon completion of the 1031 exchanges, which occurred during the third quarter of 2019. We consolidated the assets and liabilities of the Assembly Portfolio and Cascade at Landmark because we determined that WashREIT was the primary beneficiary of these properties. The results of operations from acquired operating properties are included in the consolidated statements of operations as of their acquisition dates. The revenue and earnings of our acquisitions during their year of acquisition for the three years ended December 31, 2019 are as follows (in thousands): Year Ended December 31, 2019 2018 2017 Real estate rental revenue $ 27,641 $ 22,389 $ 14,518 Net (loss) income (10,167 ) 3,623 2,226 As discussed in note 2 , we record the acquired physical assets (land, building and tenant improvements), in-place leases (absorption, tenant origination costs, leasing commissions, and net lease intangible assets/liabilities), and any other assumed liabilities on a relative fair value basis. We recorded the total cost of the above acquisitions as follows (in thousands): 2019 2018 2017 Land $ 92,391 $ 63,970 $ 45,981 Buildings and improvements 423,663 142,900 66,241 Tenant origination costs — 13,625 12,084 Leasing commissions/absorption costs 15,474 27,465 23,161 Net lease intangible assets — 3,142 498 Net lease intangible liabilities — (545 ) (9,585 ) Deferred tax liability — — (560 ) Total $ 531,528 $ 250,557 $ 137,820 As of December 31, 2019, the weighted remaining average life of the absorption costs was two months . The difference in the total cost of the 2019 acquisitions of $531.5 million and the cash paid for the acquisitions per the consolidated statements of cash flows of $528.6 million is primarily due to credits received at settlement totaling $2.9 million . The difference in the total contract purchase price of $250.0 million for the 2018 acquisition and cash paid for the acquisition per the consolidated statements of cash flows of $106.4 million is primarily due to a mortgage note assumed and repaid at settlement ( $135.5 million ), an acquisition deposit made during 2017 ( $6.3 million ), and a net credit to the buyer for certain expenditures ( $2.4 million ), partially offset by capitalized acquisition related costs ( $0.6 million ). The difference in the total contract price of $135.0 million for the 2017 acquisition and cash paid for the acquisition per the consolidated statements of cash flows of $138.4 million is primarily due to capitalized acquisition-related costs ( $2.8 million ) and a net credit to the buyer for certain expenditures ( $1.0 million ), partially offset by the issuance of 12,124 operating partnership units (“Operating Partnership Units”) as part of the consideration ( $0.4 million ). The Operating Partnership Units are units in WashREIT Watergate 600 OP LP, a consolidated subsidiary of WashREIT. These Operating Partnership Units may be redeemed for either cash equal to the fair market value of a share of WashREIT common stock at the time of redemption (based on a 20 -day average price) or, at the option of WashREIT, one registered or unregistered share of WashREIT common stock. In connection with the 2017 acquisition, we granted registration rights to the two contributors of the Watergate 600 property relating to the resale of any shares issued upon exchange of Operating Partnership Units pursuant to a shelf registration statement that we had an obligation to make available to the contributors approximately one year after the issuance of the Operating Partnership Units. This shelf registration statement was filed on March 8, 2018. Balances, net of accumulated depreciation or amortization, as appropriate, of the components of the fair value of in-place leases at December 31, 2019 and 2018 were as follows (in thousands): December 31, 2019 2018 Gross Carrying Value Accumulated Amortization Net Gross Carrying Value Accumulated Amortization Net Tenant origination costs $ 50,155 $ 33,364 $ 16,791 $ 57,897 $ 36,570 $ 21,327 Leasing commissions/absorption costs 122,348 92,401 29,947 114,354 77,194 37,160 Net lease intangible assets 15,183 11,964 3,219 16,353 11,947 4,406 Net lease intangible liabilities 29,836 20,854 8,982 31,124 20,016 11,108 Below-market ground lease intangible asset 12,080 2,282 9,798 12,080 2,093 9,987 Amortization of these combined components during the three years ended December 31, 2019 , 2018 and 2017 was as follows (in thousands): Year Ended December 31, 2019 2018 2017 Depreciation and amortization expense $ 27,123 $ 22,361 $ 13,996 Real estate rental revenue increase, net (924 ) (1,225 ) (776 ) $ 26,199 $ 21,136 $ 13,220 Amortization of these combined components over the next five years is projected to be as follows (in thousands): Depreciation and amortization expense Real estate rental revenue, net increase Total 2020 $ 9,975 $ (406 ) $ 9,569 2021 8,576 (547 ) 8,029 2022 8,078 (736 ) 7,342 2023 6,032 (974 ) 5,058 2024 5,264 (862 ) 4,402 Thereafter 18,611 (2,238 ) 16,373 Properties Sold and Held for Sale We intend to hold our properties for investment with a view to long-term appreciation, to engage in the business of acquiring, developing and owning our properties, and to make occasional sales of the properties that no longer meet our long-term strategy or return objectives and where market conditions for sale are favorable. The proceeds from the sales may be reinvested into other properties, used to fund development operations or to support other corporate needs, or distributed to our shareholders. Depreciation on these properties is discontinued when classified as held for sale, but operating revenues, other operating expenses and interest continue to be recognized through the date of sale. We classified as held for sale or sold our interests in the following properties during the three years ended December 31, 2019 : Disposition Date Property Type # of units (unaudited) Rentable Contract (Loss) Gain on Sale June 26, 2019 Quantico Corporate Center (1) Office N/A 272,000 $ 33,000 $ (1,046 ) July 23, 2019 Shopping Center Portfolio (2) Retail N/A 800,000 485,250 333,023 August 21, 2019 Frederick Crossing and Frederick County Square Retail N/A 520,000 57,500 9,507 August 27, 2019 Centre at Hagerstown Retail N/A 330,000 23,500 (3,506 ) December 19, 2019 1776 G Street Office N/A 262,000 129,500 61,007 N/A John Marshall II Office N/A 223,000 63,350 N/A Total 2019 2,407,000 $ 792,100 $ 398,985 January 19, 2018 Braddock Metro Center Office N/A 356,000 $ 93,000 $ — June 28, 2018 2445 M Street Office N/A 292,000 101,600 2,495 Total 2018 648,000 $ 194,600 $ 2,495 October 23, 2017 Walker House Apartments Multifamily 212 N/A $ 32,200 $ 23,838 Total 2017 $ 32,200 $ 23,838 ______________________________ (1) Consists of 925 and 1000 Corporate Drive. (2) Consists of five retail properties: Gateway Overlook, Wheaton Park, Olney Village Center, Bradlee Shopping Center and Shoppes of Foxchase. We have fully transferred control of the assets associated with these disposed properties and do not have continuing involvement in the operations of these properties. During the second quarter of 2019, we sold Quantico Corporate Center, an office property in Stafford, Virginia, consisting of two office buildings totaling 272,000 square feet, for a contract sale price of $33.0 million , recognizing a loss on sale of real estate of $1.0 million . Prior to the sale, due to the negotiations to sell the property, we evaluated Quantico Corporate Center for impairment and recognized an $8.4 million impairment charge during the first quarter of 2019 in order to reduce the carrying value of the property to its estimated fair value. We based this fair valuation on the expected sale price from a potential sale. There were few observable market transactions for similar properties. This fair valuation falls into Level 2 of the fair value hierarchy due to its reliance on a quoted price in a market that is not active. In June 2019, we entered into two separate purchase and sale agreements with two separate buyers to sell the Shopping Center Portfolio and the Power Center Portfolio (Frederick Crossing, Frederick County Square and Centre at Hagerstown). As of June 30, 2019, we received a non-refundable deposit from the potential buyer of the Shopping Center Portfolio and expected to receive a non-refundable deposit from the potential buyer of the Power Center Portfolio in July 2019. As of June 30, 2019, the properties in the Retail Portfolio (as defined below) met the criteria for classification as held for sale. We closed on the Shopping Center Portfolio sale transaction on July 23, 2019, recognizing a gain on sale of real estate of $333.0 million . Prior to closing on the disposition of the Shopping Center Portfolio, we prepaid the mortgage note secured by Olney Village Center (a property in the Shopping Center Portfolio), incurring a loss on extinguishment of debt of approximately $0.8 million , which we recognized in the third quarter of 2019. In the third quarter of 2019, the purchase and sale agreement to sell the Power Center Portfolio was amended to include only Frederick Crossing and Frederick County Square. We closed on the sales of these assets on August 21, 2019, recognizing a gain on sale of real estate of $9.5 million . Following the amendment to the purchase and sale agreement to sell the Power Center Portfolio, we marketed Centre at Hagerstown for sale and identified a separate buyer. We closed on the sale of this asset on August 27, 2019, recognizing a loss on sale of real estate of $3.5 million . References to the “Retail Portfolio” include the Shopping Center Portfolio and the Power Center Portfolio. The disposition of the Retail Portfolio represents a strategic shift that had a major effect on our financial results and we have accordingly reported the Retail Portfolio as discontinued operations. The Retail Portfolio represents assets generating a majority of the revenue from our retail properties and we have determined that our retail line of business is no longer a reportable segment (see note 14 ). In October 2019, we renewed and extended our lease with the World Bank at 1776 G Street NW, an office property in Washington, DC, through December 31, 2025. In December 2019, we sold the property to the World Bank for a contract sale price of $129.5 million , recognizing a gain on sale of real estate of $61.0 million . In December 2019, we executed a purchase and sale agreement to sell John Marshall II for a contract sale price of $63.4 million . We anticipate settlement in the first quarter of 2020, however, there can be no assurances that this proposed sale will be consummated. Upon execution of the purchase and sale agreement, the property met the criteria for classification as held for sale. During the first quarter of 2018, we sold Braddock Metro Center, a 356,000 square foot office property in Alexandria, Virginia for a contract sales price of $93.0 million . Due to then-ongoing negotiations to sell the property, we evaluated Braddock Metro Center for impairment and recognized a $9.1 million impairment charge during 2017 in order to reduce the carrying value of the property to its estimated fair value, less selling costs. We based this fair valuation on the expected sale price from a potential sale. There are few observable market transactions for similar properties. This fair valuation falls into Level 2 of the fair value hierarchy due to its reliance on a quoted price in a market that is not active. During the first quarter of 2018, we executed a purchase and sale agreement to sell 2445 M Street, a 292,000 square foot office property in Washington, DC, for a contract sales price of $100.0 million , with settlement originally scheduled for the third quarter of 2018. During 2017, we evaluated 2445 M Street for impairment and recognized a $24.1 million impairment charge in order to reduce the carrying value of the property to its estimated fair value. Upon execution of the purchase and sale agreement, the property met the criteria for classification as held for sale. Due to the property’s classification as held for sale, we recorded an additional impairment charge of $1.9 million in the first quarter of 2018 in order to reduce the carrying value of the property to its estimated fair value, less estimated selling costs. We based this fair value on the expected sales price from a potential sale. There are few observable market transactions for similar properties. This fair valuation falls into Level 2 of the fair value hierarchy due to its reliance on a quoted price in a market that is not active. During the second quarter of 2018, we executed an amendment to the purchase and sale agreement which increased the contract sales price to $101.6 million and advanced the settlement date. On June 28, 2018, we sold 2445 M Street, recognizing a gain on sale of real estate of $2.5 million . During the second quarter of 2017, we executed a purchase and sale agreement for the sale of Walker House Apartments, a 212 - unit multifamily property in Gaithersburg, Maryland, for a contract sales price of $32.2 million . We closed on the sale during the fourth quarter of 2017, recognizing a gain on sale of $23.8 million . Discontinued Operations The results of the Retail Portfolio are classified as discontinued operations and are summarized as follows (amounts in thousands, except for share data): 2019 2018 2017 Real estate rental revenue $ 28,200 $ 45,160 $ 44,797 Real estate expenses (6,803 ) (10,638 ) (10,251 ) Depreciation and amortization (4,926 ) (9,402 ) (10,626 ) Interest expense (313 ) (643 ) (740 ) Loss on extinguishment of debt (764 ) — — Gain on sale of real estate 339,024 — — Income from discontinued operations $ 354,418 $ 24,477 $ 23,180 Basic net income per share $ 4.39 $ 0.31 $ 0.30 Diluted net income per share $ 4.39 $ 0.31 $ 0.30 Capital expenditures $ 809 $ 2,138 $ 1,601 All assets related to the Retail Portfolio were sold as of December 31, 2019. As of December 31, 2018, assets related to the Retail Portfolio were as follows (in thousands): Land $ 88,087 Income producing property 216,577 304,664 Accumulated depreciation and amortization (101,254 ) Income producing property, net 203,410 Rents and other receivables 9,898 Prepaid expenses and other assets 8,653 Total assets $ 221,961 All liabilities related to the Retail Portfolio were sold as of December 31, 2019. As of December 31, 2018, liabilities related to the Retail Portfolio were as follows (in thousands): Mortgage notes payable, net $ 11,515 Accounts payable and other liabilities 1,620 Advance rents 1,771 Tenant security deposits 612 Liabilities related to properties sold or held for sale $ 15,518

Lease Accounting

Lease Accounting	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Lease Accounting	LEASE ACCOUNTING Leasing as a Lessor Future Minimum Rental Income As of December 31, 2019 , non-cancelable commercial operating leases provide for future minimum rental income from continuing operations as follows (in thousands): 2020 $ 139,053 2021 133,907 2022 120,491 2023 102,877 2024 91,253 Thereafter 301,974 $ 889,555 Apartment leases are not included as the terms are generally for one year or less. Rental income under most of these commercial leases increase in future years based on agreed-upon percentages or in some instances, changes in the Consumer Price Index. Leasing as a Lessee 2000 M Street, an office property in Washington, DC, is subject to an operating ground lease with a remaining term of 51 years . Rental payments under this lease are subject to percentage rent variable payments, which are not included as part of our measurement of straight-line rental expense. We recognized straight-line rental expense of $0.3 million and variable rental payments of $0.9 million during each of the three years ended December 31, 2019 . Upon adoption of ASU 2016-02, we recognized a right-of-use asset (included in Income producing property) and lease liability (included in Accounts payable and other liabilities) of $4.2 million . We used a discount rate of approximately 5.9% , which was derived from our assessment of securitized rates for similar assets and credit quality. We recognized $0.3 million of right-of-use asset and lease liability amortization during 2019. In addition, as of January 1, 2019, we reclassified the associated below-market ground lease intangible asset of $10.0 million , net of accumulated amortization of $2.1 million , from Prepaid expenses and other assets to Income producing property on our consolidated balance sheets. The following table sets forth the undiscounted cash flows of our scheduled obligations for future minimum payments on our operating ground lease as of December 31, 2019 and a reconciliation of those cash flows to the operating lease liability as of December 31, 2019 (in thousands): 2020 $ 260 2021 260 2022 260 2023 260 2024 260 Thereafter 11,895 13,195 Imputed interest (9,225 ) Lease liability $ 3,970
Lease Accounting	LEASE ACCOUNTING Leasing as a Lessor Future Minimum Rental Income As of December 31, 2019 , non-cancelable commercial operating leases provide for future minimum rental income from continuing operations as follows (in thousands): 2020 $ 139,053 2021 133,907 2022 120,491 2023 102,877 2024 91,253 Thereafter 301,974 $ 889,555 Apartment leases are not included as the terms are generally for one year or less. Rental income under most of these commercial leases increase in future years based on agreed-upon percentages or in some instances, changes in the Consumer Price Index. Leasing as a Lessee 2000 M Street, an office property in Washington, DC, is subject to an operating ground lease with a remaining term of 51 years . Rental payments under this lease are subject to percentage rent variable payments, which are not included as part of our measurement of straight-line rental expense. We recognized straight-line rental expense of $0.3 million and variable rental payments of $0.9 million during each of the three years ended December 31, 2019 . Upon adoption of ASU 2016-02, we recognized a right-of-use asset (included in Income producing property) and lease liability (included in Accounts payable and other liabilities) of $4.2 million . We used a discount rate of approximately 5.9% , which was derived from our assessment of securitized rates for similar assets and credit quality. We recognized $0.3 million of right-of-use asset and lease liability amortization during 2019. In addition, as of January 1, 2019, we reclassified the associated below-market ground lease intangible asset of $10.0 million , net of accumulated amortization of $2.1 million , from Prepaid expenses and other assets to Income producing property on our consolidated balance sheets. The following table sets forth the undiscounted cash flows of our scheduled obligations for future minimum payments on our operating ground lease as of December 31, 2019 and a reconciliation of those cash flows to the operating lease liability as of December 31, 2019 (in thousands): 2020 $ 260 2021 260 2022 260 2023 260 2024 260 Thereafter 11,895 13,195 Imputed interest (9,225 ) Lease liability $ 3,970

Mortgage Note Payable

Mortgage Note Payable	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Mortgage Note Payable	MORTGAGE NOTE PAYABLE As of December 31, 2019 and 2018 , we had outstanding mortgage notes payable, collateralized by a building and related land from our portfolio, as follows (in thousands): December 31, Properties Assumption/Issuance Date (1) Effective Interest Rate (2) 2019 2018 Payoff Date Yale West (3) 2/21/2014 3.75 % $ 45,654 $ 46,155 1/31/2020 Premiums and discounts, net 1,470 2,187 Debt issuance costs, net (50 ) (65 ) $ 47,074 $ 48,277 ______________________________ (1) This mortgage was assumed with the acquisition of the collateralized property. We record mortgages assumed in an acquisition at fair value. (2) Yield on the assumption/issuance date, including the effects of any premiums, discounts or fair value adjustments on the notes. (3) The maturity date of the mortgage note was January 1, 2052, but was prepaid in January 2020. We incurred a gain on extinguishment of debt of $0.5 million in association with this prepayment. Except as noted above, principal and interest are payable monthly until the maturity date, at which time all unpaid principal and interest are payable in full. Total cost basis of the above mortgaged properties was $77.4 million and $76.9 million at December 31, 2019 and 2018 , respectively.

Unsecured Lines of Credit Payab

Unsecured Lines of Credit Payable	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Unsecured Lines of Credit Payable	UNSECURED LINES OF CREDIT PAYABLE During the first quarter of 2018, we entered into an amended and restated credit agreement (“Credit Agreement”) which provides for a $700.0 million unsecured revolving credit facility (“Revolving Credit Facility”), the continuation of an existing $150.0 million unsecured term loan (“2015 Term Loan”) and an additional $250.0 million unsecured term loan (“2018 Term Loan”). The Revolving Credit Facility has a four -year term ending in March 2022 , with two six -month extension options, and expands our prior $600.0 million unsecured revolving credit facility that was set to expire in June 2019 . The Credit Agreement has an accordion feature that allows us to increase the facility up to $1.5 billion in the aggregate, to the extent the lenders agree to provide additional revolving loan commitments or term loans. The 2015 Term Loan has a 5.5 year term and currently has an interest rate of one month LIBOR plus 110 basis points, based on WashREIT's current unsecured debt ratings. We entered into two interest rate swaps to effectively fix the interest rate at 2.7% (see note 8 ). The 2018 Term Loan increases and replaces the $150.0 million unsecured term loan, initially entered into on July 22, 2016 (“2016 Term Loan”), that was scheduled to mature in July 2023 . The 2018 Term Loan is scheduled to mature in July 2023 and bears interest at a rate of either one month LIBOR plus a margin ranging from 0.85% to 1.75% or the base rate plus a margin ranging from 0% to 0.75% (in each case depending upon WashREIT’s credit rating). We used the $100.0 million of additional proceeds from the 2018 Term Loan primarily to repay outstanding borrowings on the Revolving Credit Facility. We had previously used interest rate derivatives to effectively fix the interest rate of the 2016 Term Loan. These interest rate derivatives now effectively fix the interest rate on a $150.0 million portion of the 2018 Term Loan at 2.31% . In March 2018, we entered into interest rate derivatives that commenced on June 29, 2018 to effectively fix the interest rate on the remaining $100.0 million of the 2018 Term Loan at 3.71% . The 2018 Term Loan has an all-in fixed interest rate of 2.87% . The amount of the Revolving Credit Facility unused and available at December 31, 2019 was as follows (in thousands): Committed capacity $ 700,000 Borrowings outstanding (56,000 ) Unused and available $ 644,000 We executed borrowings and repayments on the Revolving Credit Facility during 2019 as follows (in thousands): Balance at December 31, 2018 $ 188,000 Borrowings 687,000 Repayments (819,000 ) Balance at December 31, 2019 $ 56,000 The Revolving Credit Facility bears interest at a rate of either one month LIBOR plus a margin ranging from 0.775% to 1.55% or the base rate plus a margin ranging from 0% to 0.55% (in each case depending upon WashREIT’s credit rating). The base rate is the highest of the administrative agent's prime rate, the federal funds rate plus 0.5% and the LIBOR market index rate plus 1.0% . In addition, the Revolving Credit Facility requires the payment of a facility fee ranging from 0.10% to 0.30% (depending on WashREIT’s credit rating) on the $700 million committed capacity, without regard to usage. As of December 31, 2019 , the interest rate on the facility was LIBOR plus 1.00% , the one month LIBOR was 1.70% and the facility fee was 0.20% . All outstanding advances for the Revolving Credit Facility are due and payable upon maturity in March 2022 , unless extended pursuant to one or both of the two six-month extension options. Interest only payments are due and payable generally on a monthly basis. For the three years ended December 31, 2019 , we recognized interest expense (excluding facility fees) and facility fees as follows (in thousands): Year Ended December 31, 2019 2018 2017 Interest expense (excluding facility fees) $ 6,554 $ 6,843 $ 3,857 Facility fees 1,400 1,371 1,217 The Revolving Credit Facility contains and the prior unsecured credit facility that it replaced contained certain financial and non-financial covenants, all of which we have met as of December 31, 2019 and 2018 . Included in these covenants are limits on our total indebtedness, secured and unsecured indebtedness and required debt service payments. Information related to revolving credit facilities for the three years ended December 31, 2019 as follows (in thousands, except percentage amounts): Year Ended December 31, 2019 2018 2017 Total revolving credit facilities at December 31 $ 700,000 $ 700,000 $ 600,000 Borrowings outstanding at December 31 56,000 188,000 166,000 Weighted average daily borrowings during the year 196,074 230,934 179,633 Maximum daily borrowings during the year 300,000 429,000 252,000 Weighted average interest rate during the year 3.34 % 2.96 % 2.15 % Weighted average interest rate on borrowings outstanding at December 31 2.73 % 3.52 % 2.54 % The covenants under our Revolving Credit Facility require us to insure our properties against loss or damage in amounts customarily maintained by similar businesses or as they may be required by applicable law. The covenants for the notes require us to keep all of our insurable properties insured against loss or damage at least equal to their then full insurable value. We have an insurance policy that has no terrorism exclusion, except for non-certified nuclear, chemical and biological acts of terrorism. Our financial condition and results of operations are subject to the risks associated with acts of terrorism and the potential for uninsured losses as the result of any such acts. Effective November 26, 2002, under this existing coverage, any losses caused by certified acts of terrorism would be partially reimbursed by the United States under a formula established by federal law. Under this formula, the United States pays 85% of covered terrorism losses exceeding the statutorily established deductible paid by the insurance provider, and insurers pay 10% until aggregate insured losses from all insurers reach $100 billion in a calendar year. If the aggregate amount of insured losses under this program exceeds $100 billion during the applicable period for all insured and insurers combined, then each insurance provider will not be liable for payment of any amount which exceeds the aggregate amount of $100 billion . On December 20, 2019, The Terrorism Risk Insurance Program Reauthorization Act of 2019 was signed into law, extending the program through December 31, 2027. NOTES PAYABLE Our unsecured notes and term loans outstanding as of December 31, 2019 and 2018 are as follows (in thousands): Effective December 31, Payoff Date/ Coupon/Stated Rate Rate (1) 2019 2018 Maturity Date (2) 10 Year Unsecured Notes 4.95 % 5.05 % 250,000 $ 250,000 10/1/2020 2015 Term Loan 1 Month LIBOR + 110 basis points 2.72 % 150,000 150,000 3/15/2021 10 Year Unsecured Notes 3.95 % 4.02 % 300,000 300,000 10/15/2022 2018 Term Loan (3) 1 Month LIBOR + 110 basis points 2.87 % 250,000 250,000 7/21/2023 30 Year Unsecured Notes 7.25 % 7.36 % 50,000 50,000 2/25/2028 Total principal 1,000,000 1,000,000 Premiums and discounts, net (797 ) (1,189 ) Deferred issuance costs, net (2,481 ) (3,414 ) Total $ 996,722 995,397 ______________________________ (1) For fixed rate notes, the effective rate represents the yield on issuance date, including the effects of discounts on the notes. For variable rate notes, the effective rate represents the rate as fixed by interest rate derivatives (see note 8 ). (2) No principal amounts are due prior to maturity. (3) The 2018 Term Loan increased and replaced the 2016 Term Loan (see note 6). On April 30, 2019, we entered into a six-month, $450.0 million unsecured term loan facility (“2019 Term Loan”), maturing on October 30, 2019 with an option to extend for a six-month period. The 2019 Term Loan bore interest, at WashREIT’s option, at a rate of either LIBOR plus a margin ranging from 0.75% to 1.65% or the base rate plus a margin ranging 0.0% to 0.65% (in each case depending upon WashREIT’s credit rating). The base rate was the highest of the administrative agent’s prime rate, the federal funds rate plus 0.50% and the daily one-month LIBOR rate plus 1.0% . At WashREIT’s election, the 2019 Term Loan had an interest rate of one-week LIBOR plus 100 basis points, based on WashREIT’s current unsecured debt rating. The 2019 Term Loan was used to fund the acquisition of the Assembly Portfolio (see note 3) . During the third quarter of 2019, we repaid the $450.0 million of borrowings on the 2019 Term Loan with proceeds from the sale of the Retail Portfolio (see note 3). The required principal payments on the unsecured notes and term loans as of December 31, 2019 are as follows (in thousands): 2020 $ 250,000 2021 150,000 2022 300,000 2023 250,000 2024 — Thereafter 50,000 $ 1,000,000 Interest on these notes is payable semi-annually, except for the term loans, for which interest is payable monthly. These notes contain certain financial and non-financial covenants, all of which we have met as of December 31, 2019

Notes Payable

Notes Payable	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Notes Payable	UNSECURED LINES OF CREDIT PAYABLE During the first quarter of 2018, we entered into an amended and restated credit agreement (“Credit Agreement”) which provides for a $700.0 million unsecured revolving credit facility (“Revolving Credit Facility”), the continuation of an existing $150.0 million unsecured term loan (“2015 Term Loan”) and an additional $250.0 million unsecured term loan (“2018 Term Loan”). The Revolving Credit Facility has a four -year term ending in March 2022 , with two six -month extension options, and expands our prior $600.0 million unsecured revolving credit facility that was set to expire in June 2019 . The Credit Agreement has an accordion feature that allows us to increase the facility up to $1.5 billion in the aggregate, to the extent the lenders agree to provide additional revolving loan commitments or term loans. The 2015 Term Loan has a 5.5 year term and currently has an interest rate of one month LIBOR plus 110 basis points, based on WashREIT's current unsecured debt ratings. We entered into two interest rate swaps to effectively fix the interest rate at 2.7% (see note 8 ). The 2018 Term Loan increases and replaces the $150.0 million unsecured term loan, initially entered into on July 22, 2016 (“2016 Term Loan”), that was scheduled to mature in July 2023 . The 2018 Term Loan is scheduled to mature in July 2023 and bears interest at a rate of either one month LIBOR plus a margin ranging from 0.85% to 1.75% or the base rate plus a margin ranging from 0% to 0.75% (in each case depending upon WashREIT’s credit rating). We used the $100.0 million of additional proceeds from the 2018 Term Loan primarily to repay outstanding borrowings on the Revolving Credit Facility. We had previously used interest rate derivatives to effectively fix the interest rate of the 2016 Term Loan. These interest rate derivatives now effectively fix the interest rate on a $150.0 million portion of the 2018 Term Loan at 2.31% . In March 2018, we entered into interest rate derivatives that commenced on June 29, 2018 to effectively fix the interest rate on the remaining $100.0 million of the 2018 Term Loan at 3.71% . The 2018 Term Loan has an all-in fixed interest rate of 2.87% . The amount of the Revolving Credit Facility unused and available at December 31, 2019 was as follows (in thousands): Committed capacity $ 700,000 Borrowings outstanding (56,000 ) Unused and available $ 644,000 We executed borrowings and repayments on the Revolving Credit Facility during 2019 as follows (in thousands): Balance at December 31, 2018 $ 188,000 Borrowings 687,000 Repayments (819,000 ) Balance at December 31, 2019 $ 56,000 The Revolving Credit Facility bears interest at a rate of either one month LIBOR plus a margin ranging from 0.775% to 1.55% or the base rate plus a margin ranging from 0% to 0.55% (in each case depending upon WashREIT’s credit rating). The base rate is the highest of the administrative agent's prime rate, the federal funds rate plus 0.5% and the LIBOR market index rate plus 1.0% . In addition, the Revolving Credit Facility requires the payment of a facility fee ranging from 0.10% to 0.30% (depending on WashREIT’s credit rating) on the $700 million committed capacity, without regard to usage. As of December 31, 2019 , the interest rate on the facility was LIBOR plus 1.00% , the one month LIBOR was 1.70% and the facility fee was 0.20% . All outstanding advances for the Revolving Credit Facility are due and payable upon maturity in March 2022 , unless extended pursuant to one or both of the two six-month extension options. Interest only payments are due and payable generally on a monthly basis. For the three years ended December 31, 2019 , we recognized interest expense (excluding facility fees) and facility fees as follows (in thousands): Year Ended December 31, 2019 2018 2017 Interest expense (excluding facility fees) $ 6,554 $ 6,843 $ 3,857 Facility fees 1,400 1,371 1,217 The Revolving Credit Facility contains and the prior unsecured credit facility that it replaced contained certain financial and non-financial covenants, all of which we have met as of December 31, 2019 and 2018 . Included in these covenants are limits on our total indebtedness, secured and unsecured indebtedness and required debt service payments. Information related to revolving credit facilities for the three years ended December 31, 2019 as follows (in thousands, except percentage amounts): Year Ended December 31, 2019 2018 2017 Total revolving credit facilities at December 31 $ 700,000 $ 700,000 $ 600,000 Borrowings outstanding at December 31 56,000 188,000 166,000 Weighted average daily borrowings during the year 196,074 230,934 179,633 Maximum daily borrowings during the year 300,000 429,000 252,000 Weighted average interest rate during the year 3.34 % 2.96 % 2.15 % Weighted average interest rate on borrowings outstanding at December 31 2.73 % 3.52 % 2.54 % The covenants under our Revolving Credit Facility require us to insure our properties against loss or damage in amounts customarily maintained by similar businesses or as they may be required by applicable law. The covenants for the notes require us to keep all of our insurable properties insured against loss or damage at least equal to their then full insurable value. We have an insurance policy that has no terrorism exclusion, except for non-certified nuclear, chemical and biological acts of terrorism. Our financial condition and results of operations are subject to the risks associated with acts of terrorism and the potential for uninsured losses as the result of any such acts. Effective November 26, 2002, under this existing coverage, any losses caused by certified acts of terrorism would be partially reimbursed by the United States under a formula established by federal law. Under this formula, the United States pays 85% of covered terrorism losses exceeding the statutorily established deductible paid by the insurance provider, and insurers pay 10% until aggregate insured losses from all insurers reach $100 billion in a calendar year. If the aggregate amount of insured losses under this program exceeds $100 billion during the applicable period for all insured and insurers combined, then each insurance provider will not be liable for payment of any amount which exceeds the aggregate amount of $100 billion . On December 20, 2019, The Terrorism Risk Insurance Program Reauthorization Act of 2019 was signed into law, extending the program through December 31, 2027. NOTES PAYABLE Our unsecured notes and term loans outstanding as of December 31, 2019 and 2018 are as follows (in thousands): Effective December 31, Payoff Date/ Coupon/Stated Rate Rate (1) 2019 2018 Maturity Date (2) 10 Year Unsecured Notes 4.95 % 5.05 % 250,000 $ 250,000 10/1/2020 2015 Term Loan 1 Month LIBOR + 110 basis points 2.72 % 150,000 150,000 3/15/2021 10 Year Unsecured Notes 3.95 % 4.02 % 300,000 300,000 10/15/2022 2018 Term Loan (3) 1 Month LIBOR + 110 basis points 2.87 % 250,000 250,000 7/21/2023 30 Year Unsecured Notes 7.25 % 7.36 % 50,000 50,000 2/25/2028 Total principal 1,000,000 1,000,000 Premiums and discounts, net (797 ) (1,189 ) Deferred issuance costs, net (2,481 ) (3,414 ) Total $ 996,722 995,397 ______________________________ (1) For fixed rate notes, the effective rate represents the yield on issuance date, including the effects of discounts on the notes. For variable rate notes, the effective rate represents the rate as fixed by interest rate derivatives (see note 8 ). (2) No principal amounts are due prior to maturity. (3) The 2018 Term Loan increased and replaced the 2016 Term Loan (see note 6). On April 30, 2019, we entered into a six-month, $450.0 million unsecured term loan facility (“2019 Term Loan”), maturing on October 30, 2019 with an option to extend for a six-month period. The 2019 Term Loan bore interest, at WashREIT’s option, at a rate of either LIBOR plus a margin ranging from 0.75% to 1.65% or the base rate plus a margin ranging 0.0% to 0.65% (in each case depending upon WashREIT’s credit rating). The base rate was the highest of the administrative agent’s prime rate, the federal funds rate plus 0.50% and the daily one-month LIBOR rate plus 1.0% . At WashREIT’s election, the 2019 Term Loan had an interest rate of one-week LIBOR plus 100 basis points, based on WashREIT’s current unsecured debt rating. The 2019 Term Loan was used to fund the acquisition of the Assembly Portfolio (see note 3) . During the third quarter of 2019, we repaid the $450.0 million of borrowings on the 2019 Term Loan with proceeds from the sale of the Retail Portfolio (see note 3). The required principal payments on the unsecured notes and term loans as of December 31, 2019 are as follows (in thousands): 2020 $ 250,000 2021 150,000 2022 300,000 2023 250,000 2024 — Thereafter 50,000 $ 1,000,000 Interest on these notes is payable semi-annually, except for the term loans, for which interest is payable monthly. These notes contain certain financial and non-financial covenants, all of which we have met as of December 31, 2019

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	DERIVATIVE INSTRUMENTS On September 15, 2015 , we entered into two interest rate swap arrangements with a total notional amount of $150.0 million to swap the floating interest rate under the 2015 Term Loan (see note 7 ) to an all-in fixed interest rate of 2.72% starting on October 15, 2015 and extending until the maturity of the 2015 Term Loan on March 15, 2021 . On July 22, 2016 , we entered into two forward interest rate swap arrangements with a total notional amount of $150.0 million to swap the floating interest rate under the 2016 Term Loan (see note 7 ) to an all-in fixed interest rate of 2.86% , starting on March 31, 2017 and extending until the scheduled maturity of the 2016 Term Loan on July 21, 2023 . On March 29, 2018, we entered into the $250.0 million 2018 Term Loan (see note 7 ) maturing on July 21, 2023, which increased and replaced the 2016 Term Loan. The interest rate swap arrangements that had effectively fixed the 2016 Term Loan now effectively fix the interest rate on a $150.0 million portion of the 2018 Term Loan at 2.31% . On March 29, 2018, we entered into four interest rate swap arrangements with a total notional amount of $100.0 million to effectively fix the interest rate on the remaining $100.0 million of the 2018 Term Loan at 3.71% , that commenced on June 29, 2018 and extending until the maturity of the 2018 Term Loan on July 21, 2023 . The $250.0 million 2018 Term Loan has an all-in fixed interest rate of 2.87% (see note 6 and note 7 ). In November 2019, we entered into four interest rate swap arrangements with a total notional amount of $200.0 million to reduce our exposure to adverse fluctuations in interest rates on the future debt to replace our $250.0 million of 4.95% 10 -year unsecured notes maturing in 2020 (see note 7 ). The interest rate swaps qualify as cash flow hedges and are recorded at fair value in accordance with GAAP, based on discounted cash flow methodologies and observable inputs. We record the effective portion of changes in fair value of the cash flow hedges in other comprehensive income. The resulting unrealized loss on the effective portions of the cash flow hedges was the only activity in other comprehensive income (loss) during the periods presented in our consolidated financial statements. We assess the effectiveness of our cash flow hedges both at inception and on an ongoing basis. The cash flow hedges were effective for 2019 and 2018 and hedge ineffectiveness did not impact earnings in 2019 and 2018 . The fair values of the interest rate swaps as of December 31, 2019 and 2018 , are as follows (in thousands): Aggregate Notional Amount Effective Date Fair Value Derivative Assets (Liabilities) December 31, Derivative Instrument Maturity Date 2019 2018 Interest rate swaps $ 150,000 October 15, 2015 March 15, 2021 $ (62 ) $ 2,720 Interest rate swaps 150,000 March 31, 2017 July 21, 2023 1,825 7,918 Interest rate swaps 100,000 June 29, 2018 July 21, 2023 (3,664 ) (799 ) Interest rate swaps 200,000 April 1, 2020 April 1, 2030 3,724 — $ 600,000 $ 1,823 $ 9,839 We record interest rate swaps on our consolidated balance sheets with prepaid expenses and other assets when in a net asset position, and with accounts payable and other liabilities when in a net liability position. The interest rate swaps have been effective since inception. The gains or losses on the effective swaps are recognized in other comprehensive income, as follows (in thousands): Year Ending December 31, 2019 2018 2017 Unrealized (loss) gain on interest rate hedges $ (8,016 ) $ 420 $ 1,808 Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are made on our variable-rate debt. During the next twelve months, we estimate that $0.1 million will be reclassified as an increase to interest expense. We have agreements with each of our derivative counterparties that contain a provision whereby we could be declared in default on our derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to our default on the indebtedness. As of December 31, 2019 , the fair value of the derivative assets, including accrued interest, was $5.5 million , and the fair value of the derivative liabilities, including accrued interest, was $3.7 million . As of December 31, 2019 , we have not posted any collateral related to these agreements. Derivative instruments expose us to credit risk in the event of non-performance by the counterparty under the terms of the interest rate hedge agreement. We believe that we minimize our credit risk on these transactions by dealing with major, creditworthy financial institutions. We monitor the credit ratings of counterparties and our exposure to any single entity, thus minimizing our credit risk concentration.

Fair Value Disclosures

Fair Value Disclosures	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Disclosures	FAIR VALUE DISCLOSURES Assets and Liabilities Measured at Fair Value For assets and liabilities measured at fair value on a recurring basis, quantitative disclosures about the fair value measurements are required to be disclosed separately for each major category of assets and liabilities, as follows: Level 1: Quoted prices in active markets for identical assets Level 2: Significant other observable inputs Level 3: Significant unobservable inputs The only assets or liabilities we had at December 31, 2019 and 2018 that are recorded at fair value on a recurring basis are the assets held in the Supplemental Executive Retirement Plan ("SERP"), which primarily consists of investments in mutual funds, and the interest rate swaps (see note 8 ). We base the valuations related to the SERP on assumptions derived from significant other observable inputs and accordingly these valuations fall into Level 2 in the fair value hierarchy. The valuation of the interest rate swaps is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each interest rate swap. This analysis reflects the contractual terms of the interest rate swaps, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash payments (or receipts) and the discounted expected variable cash receipts (or payments). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. To comply with the provisions of ASC 820, we incorporate credit valuation adjustments in the fair value measurements to appropriately reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk. These credit valuation adjustments were concluded to not be significant inputs for the fair value calculations for the periods presented. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting and any applicable credit enhancements, such as the posting of collateral, thresholds, mutual puts and guarantees. The valuation of interest rate swaps fall into Level 2 in the fair value hierarchy. The fair values of these assets and liabilities at December 31, 2019 and 2018 were as follows (in thousands): December 31, 2019 December 31, 2018 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: SERP $ 1,792 $ — $ 1,792 $ — $ 1,364 $ — $ 1,364 $ — Interest rate swaps 5,549 — 5,549 — 10,638 — 10,638 — Liabilities: Interest rate swaps (3,726 ) — (3,726 ) — (799 ) — (799 ) — Financial Assets and Liabilities Not Measured at Fair Value The following disclosures of estimated fair value were determined by management using available market information and established valuation methodologies, including discounted cash flow models. Many of these estimates involve significant judgment. The estimated fair value disclosed may not necessarily be indicative of the amounts we could realize on disposition of the financial instruments. The use of different market assumptions or estimation methodologies could have an effect on the estimated fair value amounts. In addition, fair value estimates are made at a point in time and thus, estimates of fair value subsequent to December 31, 2019 may differ significantly from the amounts presented. Below is a summary of significant methodologies used in estimating fair values and a schedule of fair values at December 31, 2019 . Cash and Cash Equivalents and Restricted Cash Cash and cash equivalents and restricted cash include cash and commercial paper with original maturities of less than 90 days , which are valued at the carrying value, which approximates fair value due to the short maturity of these instruments (Level 1 inputs). Debt Mortgage notes payable consist of instruments in which certain of our real estate assets are used for collateral. We estimate the fair value of the mortgage notes payable by discounting the contractual cash flows at a rate equal to the relevant treasury rates (with respect to the timing of each cash flow) plus credit spreads estimated through independent comparisons to real estate assets or loans with similar characteristics. Line of credit payable consist of bank facilities which we use for various purposes including working capital, acquisition funding and capital improvements. The line of credit advances and term loans with floating interest rates are priced at a specified rate plus a spread. We estimate the market value based on a comparison of the spreads of the advances to market given the adjustable base rate. We estimate the fair value of the notes payable by discounting the contractual cash flows at a rate equal to the relevant treasury rates (with respect to the timing of each cash flow) plus credit spreads derived using the relevant securities’ market prices. We classify these fair value measurements as Level 3 as we use significant unobservable inputs and management judgment due to the absence of quoted market prices. As of December 31, 2019 and 2018 , the carrying values and estimated fair values of our financial instruments were as follows (in thousands): December 31, 2019 2018 Carrying Value Fair Value Carrying Value Fair Value Cash and cash equivalents $ 12,939 $ 12,939 $ 6,016 $ 6,016 Restricted cash 1,812 1,812 1,624 1,624 Mortgage notes payable 47,074 47,899 48,277 48,368 Line of credit payable 56,000 56,000 188,000 188,000 Notes payable 996,722 1,022,937 995,397 1,015,210 The mortgage note secured by Olney Village Center was reclassified to Other liabilities related to properties held for sale prior to its prepayment during the third quarter of 2019 (see note 3). As of December 31, 2018, the carrying value and estimated fair value of the mortgage note secured by Olney Village Center were $11.5 million and $12.0 million , respectively.

Stock Based Compensation

Stock Based Compensation	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Stock Based Compensation	STOCK BASED COMPENSATION WashREIT maintains short-term and long-term incentive plans that allow for stock-based awards to officers and non-officer employees. Stock based awards are provided to officers and non-officer employees, as well as trustees, under the Washington Real Estate Investment Trust 2016 Omnibus Incentive Plan which allows for awards in the form of restricted shares, restricted share units, options, and other awards up to an aggregate of 2,400,000 shares over the ten year period in which the plan will be in effect. Restricted share units are converted into shares of our stock upon full vesting through the issuance of new shares. There were no options issued or outstanding as of December 31, 2019 and 2018 . Short-Term Incentive Plan ("STIP") Under the STIP, executive officers earn awards, payable 50% in cash and 50% in restricted shares, based on a percentage of salary and an achievement rating subject to the discretion of the Compensation Committee of the board of trustees in consideration of various performance conditions and other subjective factors during a one -year performance period. With respect to the 50% of the STIP award payable in restricted shares, the restricted shares will vest over a three -year period commencing on the January 1 following the end of the one -year performance period. Prior to the adoption of the 2016 Omnibus Incentive Plan, stock based awards to officers, non-officer employees and trustees were issued under the Washington Real Estate Investment Trust 2007 Omnibus Long-Term Incentive Plan which allowed for awards in the form of restricted shares, restricted share units, options and other awards up to an aggregate of 2,000,000 shares while the plan was in effect. The grant date for the 50% of the STIP award payable in restricted shares is the date on which the Compensation Committee approves the STIP awards. We recognize compensation expense on this 50% when the grant date occurs at the end of the one -year period through the three -year vesting period. Bonuses payable under the short-term incentive plans for non-executive officers and staff are payable 100% in cash. Long-Term Incentive Plan ("LTIP") Under the LTIP, executive officers earn awards payable, 75% in unrestricted shares and 25% in restricted shares, based on a percentage of salary and the achievement of certain market conditions. For performance periods beginning prior to January 1, 2018, LTIP performance was evaluated based 50% on absolute total shareholder return (“TSR”) and 50% on relative TSR over a three -year evaluation period with a new three -year period initiating under the existing plan each year. During the first quarter of 2018, we amended the LTIP for executive officers to eliminate the absolute TSR component and only utilize relative TSR in the measurement of market condition performance. Under the amended LTIP, relative TSR is evaluated 50% relative to a defined population of peer companies and 50% relative to the FTSE NAREIT Diversified Index. The amendment became effective for three-year performance periods commencing on or after January 1, 2018. The officers' total award opportunities under the LTIP stated as a percentage of base salary ranges from 80% to 150% at target level. The unrestricted shares vest immediately at the end of the three -year performance period, and the restricted shares vest over a one -year period commencing on the January 1 following the end of the three -year performance period. We recognize compensation expense ratably (over three years for the 75% unrestricted shares and over four years for the 25% restricted shares) based on the grant date fair value, as determined using a Monte Carlo simulation, and regardless of whether the market conditions are achieved and the awards ultimately vest. We use a binomial model which employs the Monte Carlo method as of the grant date to determine the fair value of the officer LTIP awards. For three-year performance periods commencing on or after January 1, 2018, the market condition performance measurement is based on total shareholder return relative to a defined population of peer companies ( 50% weighting) and relative to the FTSE NAREIT Diversified Index ( 50% weighting). The model evaluates the awards for changing total shareholder return over the term of the vesting, relative to the peer companies and relative to the FTSE NAREIT Diversified Index, and uses random simulations that are based on past stock characteristics as well as dividend growth and other factors for WashREIT and each of the peer companies. For three-year performance periods commencing prior to January 1, 2018, the market condition performance measurement was based on total shareholder return on an absolute basis (50% weighting) and relative to a defined population of peer companies (50% weighting). The assumptions used to value the officer LTIP awards were as follows: 2019 Awards 2018 Awards 2017 Awards Expected volatility (1) 18.1 % 17.9 % 18.5% - 18.7% Risk-free interest rate (2) 2.4 % 2.4 % 1.5 % Expected term (3) 3 and 4 years 3 and 4 years 3 and 4 years Share price at grant date $23.00 $26.06 $30.84 - $32.69 (1) Expected volatility based upon historical volatility of our daily closing share price. (2) Risk-free interest rate based on U.S. treasury constant maturity bonds on the measurement date with a maturity equal to the market condition performance period. (3) Expected term based on the market condition performance period. The calculated grant date fair value as a percentage of base salary for the officers for the three-year performance period that commenced in 2019 ranged from approximately 35% to 68% for the 50% of the LTIP based on TSR relative to a defined population of peer companies and from 39% to 74% for the 50% of the LTIP based on TSR relative to the FTSE NAREIT Diversified Index. The calculated grant date fair value as a percentage of base salary for the officers for the three-year performance period that commenced in 2018 ranged from approximately 31% to 60% for the 50% of the LTIP based on TSR relative to a defined population of peer companies and from 35% to 68% for the 50% of the LTIP based on TSR relative to the FTSE NAREIT Diversified Index. The calculated grant date fair value as a percentage of base salary for the officers for the three-year performance period that commenced in 2017 ranged from approximately 37% to 67% for the 50% of the LTIP based on relative TSR and from 13% to 31% for the 50% of the LTIP based on absolute TSR. During 2017, our chief executive officer was granted a one-time equity award of 100,000 restricted shares. None of the restricted shares vest until the fifth anniversary of the grant date, at which time 100% of the restricted shares will vest, subject to Mr. McDermott's continued employment with WashREIT until such vesting date. Our non-executive officers and other employees earn restricted share unit awards under a long-term incentive plan for non-executive officers and staff based upon various percentages of their salaries and annual performance calculations. The restricted share unit awards vest ratably over three years from December 15 preceding the grant date based upon continued employment. We recognize compensation expense for these awards according to a graded vesting schedule over the three-year requisite service period. During the first quarter of 2019, we amended the STIP for executive officers and the STIP and LTIP for non-executive officers and staff to replace the use of core funds available for distribution as a performance metric and performance goal, respectively, with a Leasing Target performance metric and performance goal. Leasing Target means the aggregate annual leasing target amount (measured in square feet of leasing space) as approved by the compensation committee of our board of trustees for a given performance period and performance year, respectively, with regards to our office and retail properties. The amendments became effective as of March 18, 2019 for performance periods beginning on or after January 1, 2019. Restricted share awards made to retirement-eligible employees fully vest on the grant date. Employees are considered retirement-eligible when they are both over the age of 55 and have been employed by WashREIT for at least 20 years , or over the age of 65 . We fully recognize compensation expense for such awards as of the grant date. Trustee Awards We award share based compensation to our trustees in the form of restricted shares which vest immediately and are restricted from sale for the period of the trustees' service. The value of share-based compensation for each trustee was $100,000 for each of three years ended December 31, 2019 . Total Compensation Expense Total compensation expense recognized in the consolidated financial statements for each of the three years ended December 31, 2019 for all share based awards was $7.7 million , $6.7 million and $4.8 million , respectively, net of capitalized stock-based compensation expense of $0.2 million , $0.3 million and $0.2 million , respectively. Restricted Share Awards with Performance and Service Conditions The activity for the three years ended December 31, 2019 related to our restricted share awards, excluding those subject to market conditions, was as follows: Shares Wtd Avg Grant Fair Value Unvested at December 31, 2016 107,699 $ 26.47 Granted 330,639 32.46 Vested during year (194,569 ) 30.50 Forfeited (7,075 ) 27.43 Unvested at December 31, 2017 236,694 27.96 Granted 304,087 25.98 Vested during year (224,150 ) 27.40 Forfeited (5,621 ) 29.43 Unvested at December 31, 2018 311,010 29.07 Granted 213,782 26.26 Vested during year (236,013 ) 27.43 Forfeited (19,396 ) 26.60 Unvested at December 31, 2019 269,383 28.45 The total fair value of share grants vested for each of the three years ended December 31, 2019 was $6.5 million , $6.1 million and $5.9 million , respectively. As of December 31, 2019 , the total compensation cost related to non-vested share awards not yet recognized was $5.9 million , which we expect to recognize over a weighted average period of 22 months . Restricted and Unrestricted Shares with Market Conditions Stock based awards with market conditions under the LTIP were granted in 2019 , 2018 and 2017 with fair market values, as determined using a Monte Carlo simulation, as follows (in thousands): Grant Date Fair Value 2019 Awards 2018 Awards 2017 Awards Restricted Unrestricted Restricted Unrestricted Restricted Unrestricted Relative Peer TSR $ 184 $ 552 $ 203 $ 608 $ 222 $ 666 Absolute/Index TSR (1) 201 602 230 690 100 299 The unamortized value of these awards with market conditions as of December 31, 2019 was as follows (in thousands): 2019 Awards 2018 Awards 2017 Awards Restricted Unrestricted Restricted Unrestricted Restricted Unrestricted Relative Peer TSR $ 138 $ 368 $ 85 $ 171 $ 44 $ — Absolute/Index TSR (1) 151 401 96 194 20 — ______________________________ (1) The performance conditions for the 2019 and 2018 awards were evaluated based on 50% on TSR relative to a defined population of peer companies and 50% on TSR relative to the FTSE NAREIT Diversified Index. The performance condition for the 2017 awards was evaluated based 50% on absolute TSR and 50% on relative TSR.

Other Benefit Plans

Other Benefit Plans	12 Months Ended
	Dec. 31, 2019
Defined Benefit Plan [Abstract]
Other Benefit Plans	OTHER BENEFIT PLANS We have a Retirement Savings Plan (the “401(k) Plan”), which permits all eligible employees to defer a portion of their compensation in accordance with the Code. Under the 401(k) Plan, we may make discretionary contributions on behalf of eligible employees. For each of the three years ended December 31, 2019 , we made contributions to the 401(k) plan of $0.5 million , $0.5 million and $0.4 million , respectively. We have adopted non-qualified deferred compensation plans for the officers and members of the board of trustees. The plans allow for a deferral of a percentage of annual cash compensation and trustee fees. The plans are unfunded and payments are to be made out of the general assets of WashREIT. The deferred compensation liability was $0.9 million and $1.1 million at December 31, 2019 and 2018 , respectively. In November 2005, the board of trustees approved the establishment of a SERP for the benefit of officers. This is a defined contribution plan under which, upon a participant's termination of employment from WashREIT for any reason other than discharge for cause, the participant will be entitled to receive a benefit equal to the participant's accrued benefit times the participant's vested interest. We account for this plan in accordance with ASC 710-10 and ASC 320-10, whereby the investments are reported at fair value, and unrealized holding gains and losses are included in earnings. At December 31, 2019 and 2018 , the accrued benefit liability was $1.8 million and $1.4 million , respectively. For each of the three years ended December 31, 2019 , we recognized current service cost of $0.2 million , $0.3 million and $0.3 million

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings per Common Share	EARNINGS PER COMMON SHARE We determine “Basic earnings per share” using the two-class method as our unvested restricted share awards and units have non-forfeitable rights to dividends, and are therefore considered participating securities. We compute basic earnings per share by dividing net income attributable to the controlling interest less the allocation of undistributed earnings to unvested restricted share awards and units by the weighted-average number of common shares outstanding for the period. We also determine “Diluted earnings per share” as the more dilutive of the two-class method or the treasury stock method with respect to the unvested restricted share awards. We further evaluate any other potentially dilutive securities at the end of the period and adjust the basic earnings per share calculation for the impact of those securities that are dilutive. Our dilutive earnings per share calculation includes the dilutive impact of operating partnership units under the if-converted method and our share based awards with performance conditions prior to the grant date and all market condition awards under the contingently issuable method. The computation of basic and diluted earnings per share for the three years ended December 31, 2019 was as follows (in thousands; except per share data): Year Ended December 31, 2019 2018 2017 Numerator: Income (loss) from continuing operations $ 29,132 $ 1,153 $ (3,568 ) Net loss attributable to noncontrolling interests — — 56 Allocation of losses (earnings) from continuing operations to unvested restricted share awards (125 ) (526 ) (362 ) Adjusted income (loss) from continuing operations attributable to the controlling interests 29,007 627 (3,874 ) Income from discontinued operations, including gain on sale of real estate 354,418 24,477 23,180 Net loss attributable to noncontrolling interests — — — Allocation of earnings from discontinued operations to unvested restricted share awards (1,837 ) — — Adjusted income from discontinued operations 352,581 24,477 23,180 Adjusted net income attributable to the controlling interests $ 381,588 $ 25,104 $ 19,306 Denominator: Weighted average shares outstanding – basic 80,257 78,960 76,820 Effect of dilutive securities: Operating partnership units 12 12 — Employee restricted share awards 66 70 — Weighted average shares outstanding – diluted 80,335 79,042 76,820 Earnings per common share, basic: Continuing operations $ 0.36 $ 0.01 $ (0.05 ) Discontinued operations 4.39 0.31 0.30 Basic net income attributable to the controlling interests per common share $ 4.75 $ 0.32 $ 0.25 Earnings per common share, diluted: Continuing operations $ 0.36 $ 0.01 $ (0.05 ) Discontinued operations 4.39 0.31 0.30 Diluted net income attributable to the controlling interests per common share $ 4.75 $ 0.32 $ 0.25 Dividends declared per common share $ 1.20 $ 1.20 $ 1.20

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Development Commitments At December 31, 2019 , we had no committed contracts outstanding with third parties in connection with our development and redevelopment projects. Litigation We are involved from time to time in various legal proceedings, lawsuits, examinations by various tax authorities and claims that have arisen in the ordinary course of business. Management believes that the resolution of any such current matters will not have a material adverse effect on our financial condition or results of operations.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2019
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Segment Information	SEGMENT INFORMATION We evaluate real estate performance and allocate resources by property type and have two reportable segments: office and multifamily. Office properties provide office space for various types of businesses and professions. Multifamily properties provide rental housing for individuals and families throughout the Washington metro region. We previously had a retail segment consisting of grocery store-anchored neighborhood centers that include other small shop tenants and regional power centers with several junior box tenants. During 2019, we executed the sales of eight retail properties (see note 3). These properties met the criteria for classification as held for sale as of June 30, 2019 and are classified as discontinued operations. This strategic shift simplified our portfolio to two reportable segments (office and multifamily) and reduced our exposure to future retail lease expirations. The remaining retail properties do not meet the qualitative or quantitative criteria for a reportable segment, and are classified within “Corporate and other” on our segment disclosure tables. The dispositions of the eight retail properties are part of a strategic shift away from the retail sector. Real estate rental revenue as a percentage of the total for each of the reportable operating segments for the three years ended December 31, 2019 was as follows: Year Ended December 31, 2019 2018 2017 Multifamily 41 % 33 % 34 % Office 53 % 61 % 60 % Corporate and other 6 % 6 % 6 % The percentage of income producing real estate assets classified as held and used, at cost, for each of the reportable operating segments as of December 31, 2019 and 2018 was as follows: December 31, 2019 2018 Multifamily 50 % 36 % Office 45 % 58 % Corporate and other 5 % 6 % The accounting policies of each of the segments are the same as those described in note 2. We evaluate performance based upon net operating income from the combined properties in each segment. Our reportable operating segments are consolidations of similar properties. GAAP requires that segment disclosures present the measure(s) used by the chief operating decision maker for purposes of assessing segments’ performance. Net operating income is a key measurement of our segment profit and loss. Net operating income is defined as segment real estate rental revenue less segment real estate expenses. The following tables present revenues, net operating income, capital expenditures and total assets for the three years ended December 31, 2019 from these segments, and reconciles net operating income of reportable segments to net income attributable to the controlling interests as reported (in thousands): Year Ended December 31, 2019 Office Multifamily Corporate (1) Consolidated Real estate rental revenue $ 164,059 $ 126,131 $ 18,990 $ 309,180 Real estate expenses 60,923 49,135 5,522 115,580 Net operating income $ 103,136 $ 76,996 $ 13,468 $ 193,600 Depreciation and amortization (136,253 ) General and administrative (24,370 ) Lease origination expenses (1,698 ) Interest expense (53,734 ) Real estate impairment (8,374 ) Gain on sale of real estate 59,961 Discontinued operations: Income from properties sold or held for sale 16,158 Gain on sale of real estate 339,024 Loss on extinguishment of debt (764 ) Net income 383,550 Less: Net loss attributable to noncontrolling interests — Net income attributable to the controlling interests $ 383,550 Capital expenditures $ 38,634 $ 25,779 $ 4,534 $ 68,947 Total assets $ 1,134,147 $ 1,340,634 $ 153,547 $ 2,628,328 Year Ended December 31, 2018 Office Multifamily Corporate and Other (1) Consolidated Real estate rental revenue $ 178,474 $ 95,194 $ 18,062 $ 291,730 Real estate expenses 63,321 37,235 5,036 105,592 Net operating income $ 115,153 $ 57,959 $ 13,026 $ 186,138 Depreciation and amortization (111,826 ) General and administrative (22,089 ) Real estate impairment (1,886 ) Interest expense (50,501 ) Gain on sale of real estate 2,495 Loss on extinguishment of debt (1,178 ) Discontinued operations: Income from properties sold or held for sale 24,477 Net income 25,630 Less: Net loss attributable to noncontrolling interests — Net income attributable to the controlling interests $ 25,630 Capital expenditures $ 42,019 $ 25,117 $ 4,897 $ 72,033 Total assets $ 1,248,673 $ 792,170 $ 376,261 $ 2,417,104 Year Ended December 31, 2017 Office Multifamily Corporate and Other (1) Consolidated Real estate rental revenue $ 167,438 $ 95,250 $ 17,593 $ 280,281 Real estate expenses 62,824 37,640 4,936 105,400 Net operating income $ 104,614 $ 57,610 $ 12,657 $ 174,881 Depreciation and amortization (101,430 ) General and administrative (22,580 ) Casualty gain (33,152 ) Interest expense (46,793 ) Other income 507 Gain on sale of real estate 24,915 Income tax benefit 84 Discontinued operations: Income from properties sold or held for sale 23,180 Net income 19,612 Less: Net loss attributable to noncontrolling interests 56 Net income attributable to the controlling interests $ 19,668 Capital expenditures $ 30,407 $ 27,980 $ 5,994 $ 64,381 Total assets $ 1,203,187 $ 767,279 $ 388,960 $ 2,359,426 ______________________________ (1) Includes the retail properties not classified as discontinued operations: Takoma Park, Westminster, Concord Centre, Chevy Chase Metro Plaza, 800 S. Washington Street, Randolph Shopping Center, Montrose Shopping Center and Spring Valley Village, and total assets and capital expenditures include all retail properties, including those classified as discontinued operations.

Selected Quarterly Financial Da

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (Unaudited)	SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) Unaudited financial data by quarter in each of the years ended December 31, 2019 and 2018 were as follows (in thousands, except for per share data): Quarter (1), (2) First Second Third Fourth 2019 Real estate rental revenue $ 71,434 $ 76,820 $ 80,259 $ 80,667 (Loss) income from continuing operations $ (10,443 ) $ (6,191 ) $ (8,432 ) $ 54,198 Net (loss) income $ (4,405 ) $ 987 $ 332,770 $ 54,198 Net (loss) income attributable to the controlling interests $ (4,405 ) $ 987 $ 332,770 $ 54,198 (Loss) income from continuing operations per share Basic $ (0.13 ) $ (0.08 ) $ (0.10 ) $ 0.66 Diluted $ (0.13 ) $ (0.08 ) $ (0.10 ) $ 0.66 Net income per share Basic $ (0.06 ) $ 0.01 $ 4.14 $ 0.66 Diluted $ (0.06 ) $ 0.01 $ 4.14 $ 0.66 2018 Real estate rental revenue $ 73,645 $ 75,344 $ 71,001 $ 71,740 (Loss) income from continuing operations $ (2,559 ) $ 4,563 $ (547 ) $ (304 ) Net income $ 3,299 $ 10,750 $ 5,893 $ 5,688 Net income attributable to the controlling interests $ 3,299 $ 10,750 $ 5,893 $ 5,688 Income (loss) from continuing operations per share Basic $ (0.03 ) $ 0.06 $ (0.01 ) $ — Diluted $ (0.03 ) $ 0.06 $ (0.01 ) $ — Net income per share Basic $ 0.04 $ 0.14 $ 0.07 $ 0.07 Diluted $ 0.04 $ 0.13 $ 0.07 $ 0.07 ______________________________ (1) With regard to per share calculations, the sum of the quarterly results may not equal full year results due to rounding. (2) The second quarter of 2019 includes a loss on sale of real estate of $1.0 million . The third and fourth quarters of 2019 include gains on sale of real estate of $339.0 million and $61.0 million , respectively. The second quarter of 2018 includes a gain on sale of real estate of $2.5 million . The first quarter of 2019 and first quarter of 2018 include real estate impairments of $8.4 million and $1.9 million

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Shareholders' Equity	SHAREHOLDERS' EQUITY On May 4, 2018, we entered into eight separate equity distribution agreements (collectively, the “2018 Equity Distribution Agreements”) with each of Wells Fargo Securities, LLC, BNY Mellon Capital Markets, LLC, Capital One Securities, Inc., Citigroup Global Markets Inc., Goldman Sachs & Co. LLC, J.P. Morgan Securities LLC, KeyBanc Capital Markets Inc. and SunTrust Robinson Humphrey, Inc. relating to the issuance of up to $250.0 million of our common shares from time to time under our at-the-market program. Issuances of our common shares are made at market prices prevailing at the time of issuance. We may use net proceeds from the issuance of common shares under this program for general business purposes, including, without limitation, working capital, the acquisition, renovation, expansion, improvement, development or redevelopment of income producing properties or the repayment of debt. Our issuances and net proceeds on the 2018 Equity Distribution Agreements for the years ended December 31, 2019 and 2018 were as follows (in thousands; except per share data): Year Ended December 31, 2019 2018 Issuance of common shares 1,859 1,165 Weighted average price per share $ 30.00 $ 31.18 Net proceeds $ 54,916 $ 35,472 The 2018 Equity Distribution Agreements replaced our previous equity distribution agreements with Wells Fargo Securities, LLC, BNY Mellon Capital Markets, LLC, Citigroup Global Markets Inc. and RBC Capital Markets LLC, dated June 23, 2015. We did not issue any common shares on the previous equity distribution agreements during 2018. For the year ended December 31, 2017, we issued 3.6 million common shares at a weighted average price per share of $32.06 for net proceeds of $113.2 million on the previous equity distribution agreements. We have a dividend reinvestment program, whereby shareholders may use their dividends and optional cash payments to purchase common shares. The common shares sold under this program may either be common shares issued by us or common shares purchased in the open market. Net proceeds under this program are used for general corporate purposes. Our issuances and net proceeds on the dividend reinvestment program for the three years ended December 31, 2019 were as follows (in thousands; except per share data): Year Ended December 31, 2019 2018 2017 Issuance of common shares 173 81 80 Weighted average price per share $ 27.58 $ 29.18 $ 32.25 Net proceeds $ 4,755 $ 1,973 $ 2,576

Deferred Costs

Deferred Costs	12 Months Ended
	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Costs	DEFERRED COSTS As of December 31, 2019 and 2018 , deferred leasing costs and deferred leasing incentives were included in prepaid expenses and other assets as follows (in thousands): December 31, 2019 2018 Gross Carrying Value Accumulated Amortization Net Gross Carrying Value Accumulated Amortization Net Deferred leasing costs $ 60,900 $ 29,580 $ 31,320 $ 63,659 $ 31,438 $ 32,221 Deferred leasing incentives 18,926 11,133 7,793 22,801 12,311 10,490 Amortization, including write-offs, of deferred leasing costs and deferred leasing incentives for the three years ended December 31, 2019 were as follows (in thousands): Year Ended December 31, 2019 2018 2017 Deferred leasing costs amortization $ 6,599 $ 5,881 $ 5,784 Deferred leasing incentives amortization 2,862 2,811 3,009

Schedule II Valuation and Quali

Schedule II Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II Valuation and Qualifying Accounts	SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS FOR THE YEARS ENDED DECEMBER 31, 2019 , 2018 AND 2017 (IN THOUSANDS) Balance at Beginning of Year Additions Charged to Expenses Net Recoveries Balance at End of Year Valuation allowance for deferred tax assets 2019 $ 1,419 $ — $ (17 ) $ 1,402 2018 $ 1,413 $ 6 $ — $ 1,419 2017 $ 2,882 $ — $ (1,469 ) $ 1,413

Schedule III Real Estate and Ac

Schedule III Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III Real Estate and Accumulated Depreciation	SCHEDULE III Initial Cost (b) Net Improvements (Retirement) since Acquisition Gross Amounts at Which Carried at December 31, 2019 Accumulated Depreciation at December 31, 2019 Properties Location Land Buildings and Improvements Land Buildings and Improvements Total (c) Year of Construction Date of Acquisition Net Rentable Square Feet Units Depreciation Life (d) Multifamily Properties 3801 Connecticut Avenue Washington, DC $ 420,000 $ 2,678,000 $ 19,357,000 $ 420,000 $ 22,035,000 $ 22,455,000 $ 13,543,000 1951 Jan 1963 178,000 307 30 years Roosevelt Towers Virginia 336,000 1,996,000 13,659,000 336,000 15,655,000 15,991,000 11,418,000 1964 May 1965 170,000 191 40 years Park Adams Virginia 287,000 1,654,000 13,636,000 287,000 15,290,000 15,577,000 11,178,000 1959 Jan 1969 173,000 200 35 years The Ashby at McLean (f) Virginia 4,356,000 17,102,000 27,319,000 4,356,000 44,421,000 48,777,000 29,047,000 1982 Aug 1996 274,000 256 30 years Bethesda Hill Apartments Maryland 3,900,000 13,412,000 16,545,000 3,900,000 29,957,000 33,857,000 21,017,000 1986 Nov 1997 225,000 195 30 years Bennett Park Virginia 2,861,000 917,000 81,896,000 4,774,000 80,900,000 85,674,000 40,308,000 2007 Feb 2001 215,000 224 28 years The Clayborne Virginia 269,000 — 31,374,000 699,000 30,944,000 31,643,000 16,971,000 2008 Jun 2003 60,000 74 26 years The Kenmore Washington, DC 28,222,000 33,955,000 18,109,000 28,222,000 52,064,000 80,286,000 17,415,000 1948 Sep 2008 268,000 374 30 years The Maxwell Virginia 12,787,000 — 38,145,000 12,848,000 38,084,000 50,932,000 11,018,000 2014 Jun 2011 116,000 163 30 years The Paramount (f) Virginia 8,568,000 38,716,000 3,101,000 8,568,000 41,817,000 50,385,000 11,261,000 1984 Oct 2013 141,000 135 30 years Yale West (a) Washington, DC 14,684,000 62,069,000 1,688,000 14,684,000 63,757,000 78,441,000 13,442,000 2011 Feb 2014 173,000 216 30 years The Wellington Virginia 30,548,000 116,563,000 16,178,000 30,548,000 132,741,000 163,289,000 21,947,000 1960 Jul 2015 600,000 711 30 years The Trove (e) Virginia 15,000,000 — 93,941,000 2,250,000 106,692,000 108,942,000 146,000 n/a Jul 2015 — n/a n/a Riverside Apartments Virginia 38,924,000 184,854,000 35,517,000 38,924,000 220,371,000 259,295,000 30,363,000 1971 May 2016 1,001,000 1,222 30 years Riverside Apartments land parcel (e) Virginia 15,968,000 — 9,674,000 — 25,642,000 25,642,000 — n/a May 2016 — n/a n/a Assembly Alexandria Virginia 23,942,000 93,672,000 1,931,000 23,942,000 95,603,000 119,545,000 2,595,000 1990 Jun 2019 437,000 532 30 years Assembly Manassas Virginia 13,586,000 68,802,000 617,000 13,586,000 69,419,000 83,005,000 2,015,000 1986 Jun 2019 390,000 408 30 years Assembly Dulles Virginia 12,476,000 66,852,000 535,000 12,476,000 67,387,000 79,863,000 1,913,000 2000 Jun 2019 361,000 328 30 years Assembly Leesburg Virginia 4,113,000 21,286,000 102,000 4,113,000 21,388,000 25,501,000 691,000 1986 Jun 2019 124,000 134 30 years Assembly Herndon Virginia 11,225,000 51,534,000 690,000 11,225,000 52,224,000 63,449,000 1,618,000 1991 Jun 2019 221,000 283 30 years Assembly Germantown Maryland 7,609,000 34,431,000 179,000 7,609,000 34,610,000 42,219,000 891,000 1990 Jun 2019 211,000 218 30 years Assembly Watkins Mill Maryland 7,151,000 30,851,000 210,000 7,151,000 31,061,000 38,212,000 756,000 1975 Jun 2019 193,000 210 30 years Cascade at Landmark Virginia 12,289,000 56,235,000 578,000 12,289,000 56,813,000 69,102,000 1,141,000 1988 Sep 2019 273,000 277 30 years $ 269,521,000 $ 897,579,000 $ 424,981,000 $ 243,207,000 $ 1,348,875,000 $ 1,592,082,000 $ 260,694,000 5,804,000 6,658 Office Buildings 1901 Pennsylvania Avenue Washington, DC $ 892,000 $ 3,481,000 $ 20,595,000 $ 892,000 $ 24,076,000 $ 24,968,000 $ 18,613,000 1960 May 1977 101,000 28 years 515 King Street Virginia 4,102,000 3,931,000 9,264,000 4,102,000 13,195,000 17,297,000 7,112,000 1966 Jul 1992 75,000 50 years 1220 19th Street Washington, DC 7,803,000 11,366,000 16,634,000 7,803,000 28,000,000 35,803,000 18,859,000 1976 Nov 1995 103,000 30 years 1600 Wilson Boulevard Virginia 6,661,000 16,742,000 31,274,000 6,661,000 48,016,000 54,677,000 29,563,000 1973 Oct 1997 170,000 30 years Silverline Center (f) Virginia 12,049,000 71,825,000 102,283,000 12,049,000 174,108,000 186,157,000 104,536,000 1972 Nov 1997 549,000 30 years Courthouse Square Virginia — 17,096,000 10,172,000 — 27,268,000 27,268,000 17,615,000 1979 Oct 2000 120,000 30 years Monument II Virginia 10,244,000 65,205,000 12,332,000 10,244,000 77,537,000 87,781,000 35,474,000 2000 Mar 2007 209,000 30 years 2000 M Street Washington, DC — 61,101,000 41,735,000 — 102,836,000 102,836,000 40,369,000 1971 Dec 2007 232,000 30 years 1140 Connecticut Avenue Washington, DC 25,226,000 50,495,000 18,799,000 25,226,000 69,294,000 94,520,000 24,486,000 1966 Jan 2011 184,000 30 years 1227 25th Street Washington, DC 17,505,000 21,319,000 11,454,000 17,505,000 32,773,000 50,278,000 11,315,000 1988 Mar 2011 135,000 30 years John Marshall II Virginia 13,490,000 53,024,000 9,534,000 13,490,000 62,558,000 76,048,000 19,020,000 1996 Sep 2011 223,000 30 years Fairgate at Ballston Virginia 17,750,000 29,885,000 7,203,000 17,750,000 37,088,000 54,838,000 12,571,000 1988 Jun 2012 145,000 30 years Army Navy Building Washington, DC 30,796,000 39,315,000 13,201,000 30,796,000 52,516,000 83,312,000 13,078,000 1912 Mar 2014 108,000 30 years Initial Cost (b) Net Improvements (Retirement) since Acquisition Gross Amounts at Which Carried at December 31, 2019 Accumulated Depreciation at December 31, 2019 Properties Location Land Buildings and Improvements Land Buildings and Improvements Total (c) Year of Construction Date of Acquisition Net Rentable Square Feet Units Depreciation Life (d) 1775 Eye Street, NW Washington, DC 48,086,000 51,074,000 16,328,000 48,086,000 67,402,000 115,488,000 17,232,000 1964 May 2014 189,000 30 years Watergate 600 Washington, DC 45,981,000 78,325,000 39,225,000 45,981,000 117,550,000 163,531,000 13,419,000 1972 Apr 2017 293,000 30 years Arlington Tower Virginia 63,970,000 156,525,000 10,951,000 63,970,000 167,476,000 231,446,000 14,437,000 1980 Jan 2018 391,000 30 years $ 304,555,000 $ 730,709,000 $ 370,984,000 $ 304,555,000 $ 1,101,693,000 $ 1,406,248,000 $ 397,699,000 3,227,000 Initial Cost (b) Net Improvements (Retirement) since Acquisition Gross Amounts at Which Carried at December 31, 2019 Accumulated Depreciation at December 31, 2019 Properties Location Land Buildings and Improvements Land Buildings and Improvements Total (c) Year of Construction Date of Acquisition Net Rentable Square Feet Units Depreciation Life (d) Retail Centers Takoma Park (f) Maryland $ 415,000 $ 1,084,000 $ 289,000 $ 366,000 $ 1,423,000 $ 1,789,000 $ 1,205,000 1962 Jul 1963 51,000 50 years Westminster Maryland 519,000 1,775,000 9,988,000 519,000 11,763,000 12,282,000 8,614,000 1969 Sep 1972 150,000 37 years Concord Centre Virginia 413,000 850,000 7,415,000 413,000 8,265,000 8,678,000 4,036,000 1960 Dec 1973 75,000 33 years Chevy Chase Metro Plaza Washington, DC 1,549,000 4,304,000 8,377,000 1,549,000 12,681,000 14,230,000 8,287,000 1975 Sep 1985 49,000 50 years 800 S. Washington Street Virginia 2,904,000 5,489,000 6,168,000 2,904,000 11,657,000 14,561,000 6,196,000 1955 Jun 1998 46,000 30 years Randolph Shopping Center Maryland 4,928,000 13,025,000 1,200,000 4,928,000 14,225,000 19,153,000 6,846,000 1972 May 2006 83,000 30 years Montrose Shopping Center (f) Maryland 11,612,000 22,410,000 2,604,000 11,020,000 25,606,000 36,626,000 11,856,000 1970 May 2006 149,000 30 years Spring Valley Village Washington, DC 10,836,000 32,238,000 10,740,000 10,836,000 42,978,000 53,814,000 7,197,000 1941 Oct 2014 92,000 30 years $ 33,176,000 $ 81,175,000 $ 46,781,000 $ 32,535,000 $ 128,598,000 $ 161,133,000 $ 54,237,000 695,000 Total $ 607,252,000 $ 1,709,463,000 $ 842,746,000 $ 580,297,000 $ 2,579,166,000 $ 3,159,463,000 $ 712,630,000 9,726,000 6,658 ______________________________ a) At December 31, 2019 , our properties were encumbered by non-recourse mortgage amounts of $45.7 million on Yale West. Mortgage amounts exclude premiums and debt loan costs. b) The purchase cost of real estate investments has been divided between land and buildings and improvements on the basis of management’s determination of the fair values. c) At December 31, 2019 , total land, buildings and improvements are carried at $1,917.8 million for federal income tax purposes. d) The useful life shown is for the main structure. Buildings and improvements are depreciated over various useful lives ranging from 3 to 50 years. e) As of December 31, 2019 , WashREIT had under development multifamily properties, The Trove and Riverside Apartments land parcel. The value not yet placed into service at December 31, 2019 was $96.7 million and $25.6 million , respectively. f) As of December 31, 2019 , WashREIT had investments in various development, redevelopment and renovation projects, including The Ashby at McLean, Montrose Shopping Center, Silverline Center, Takoma Park and The Paramount. The total value of these projects, which has not yet been placed in service, is $1.9 million at December 31, 2019 The following is a reconciliation of real estate assets and accumulated depreciation for the three years ended December 31, 2019 (in thousands): Year Ended December 31, 2019 2018 2017 Real estate assets Balance, beginning of period $ 2,973,816 $ 2,831,683 $ 2,725,635 Additions: Property acquisitions (1) 516,054 220,495 124,306 Improvements (1) 140,109 103,404 84,560 Deductions: Impairment write-down (24,432 ) (2,177 ) (81,982 ) Write-off of disposed assets (7,430 ) (2,132 ) (2,655 ) Property sales (438,654 ) (177,457 ) (18,181 ) Balance, end of period $ 3,159,463 $ 2,973,816 $ 2,831,683 Accumulated depreciation Balance, beginning of period $ 770,535 $ 690,417 $ 657,425 Additions: Depreciation 107,938 98,141 94,558 Deductions: Impairment write-down (16,058 ) (291 ) (48,830 ) Write-off of disposed assets (2,173 ) (1,859 ) (1,708 ) Property sales (147,612 ) (15,873 ) (11,028 ) Balance, end of period $ 712,630 $ 770,535 $ 690,417 ______________________________ (1) Includes non-cash accruals for capital items.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies and Basis of Presentation (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Principles of Consolidation and Basis of Presentation	Principles of Consolidation and Basis of Presentation The accompanying audited consolidated financial statements include the consolidated accounts of WashREIT and our subsidiaries and entities in which WashREIT has a controlling financial interest. All intercompany balances and transactions have been eliminated in consolidation. We have prepared the accompanying audited consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission.
Use of Estimates in the Financial Statements	Use of Estimates in the Financial Statements
Recent Accounting Pronouncements	Recent Accounting Standards Standards Adopted Standard/Description Effective Date and Adoption Considerations Effect on Financial Statements or Other significant Matters ASU 2016-02, Leases (Topic 842) . This standard amends existing lease accounting standards for both lessees and lessors. Lessees must classify most leases as either finance or operating leases. For lease contracts, or contracts with an embedded lease, with a duration of more than one year in which we are the lessee, the present value of future lease payments are recognized on our consolidated balance sheets as a right-of-use asset and a corresponding lease liability. Lessors Lease contracts currently classified as operating leases are accounted for similarly to prior guidance. However, lessors are required to account for each lease and non-lease component, such as common area maintenance or tenant service revenues, of a contract separately. In July 2018, the FASB issued 2018-11, Leases (Topic 842) - Targeted Improvements (“ASU 2018-11”), which provides lessors optional transition relief from implementing this aspect of ASU 2016-02 if the following criteria are met: (1) both components have the same timing and pattern of revenue and (2) if accounted for separately, both components would be classified as an operating lease. Also, under ASU 2016-02, only incremental costs or initial direct costs of executing a lease contract qualify for capitalization, while prior accounting standards allowed for the capitalization of indirect leasing costs. We adopted the new standard as of January 1, 2019. We adopted ASU 2016-02 as of January 1, 2019 using the modified retrospective approach and by applying the transitional practical expedients noted below. Under the modified retrospective approach, we recognized a cumulative effect adjustment of $0.9 million to distributions in excess of net income as of January 1, 2019 (see note 4 for further discussion of the impact of adoption on our consolidated financial statements). We did not elect the hindsight expedient, which would have allowed us to reevaluate lease terms in calculating lease liabilities as part of adoption. We elected not to bifurcate lease contracts into lease and non-lease components, since: (1) the timing and pattern of revenue is not materially different and the non-lease components are not the primary component of the lease, and (2) the lease component, if accounted for separately, would be classified as an operating lease. Accordingly, both lease and non-lease components are presented in “Real estate rental revenue” in our consolidated financial statements. The adoption of ASU 2016-02 did not result in a material change to our recognition of real estate rental revenue. New Accounting Standards Issued But Not Yet Effective Standard/Description Effective Date and Adoption Considerations Effect on Financial Statements or Other significant Matters ASU 2016-13, Measurement of Credit Losses on Financial Instruments . This standard requires financial assets measured at an amortized cost basis, including trade receivables, to be presented at the net amount expected to be collected. This standard does not apply to receivables arising from operating leases accounted for in accordance with Topic 842. We adopted the new standard as of January 1, 2020. The adoption of the new standard did not have a material impact on our consolidated financial statements. ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software . This standard requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance to determine which implementation costs to capitalize as assets. We adopted the new standard as of January 1, 2020. The adoption of the new standard did not have a material impact on our consolidated financial statements.
Revenue Recognition	Revenue Recognition We lease multifamily properties under operating leases with terms of generally one year or less. We lease commercial properties under operating leases with an average term of seven years . Substantially all commercial leases contain fixed escalations or, in some instances, changes based on the Consumer Price Index, which occur at specified times during the term of the lease. In certain commercial leases, variable lease income, such as percentage rent, is recognized when rents are earned. We recognize rental income and rental abatements from our multifamily and commercial leases on a straight-line basis over the lease term. Recognition of rental income commences when control of the leased space has been transferred to the tenant. We recognize gains on sales of real estate when we have executed a contract for sale of the asset, transferred controlling financial interest in the asset to the buyer and determined that it is probable that we will collect substantially all of the consideration for the asset. Our real estate sale transactions typically meet these criteria at closing. We recognize cost reimbursement income from pass-through expenses on an accrual basis over the periods in which the expenses were incurred. Pass-through expenses are comprised of real estate taxes, operating expenses and common area maintenance costs which are reimbursed by tenants in accordance with specific allowable costs per tenant lease agreements. Parking revenues are derived from leases, monthly parking agreements and transient parking. We recognize parking revenues from leases on a straight-line basis over the lease term and monthly parking revenues as earned. We recognize transient parking revenue when our performance obligation is met.
Accounts Receivable and Allowance for Doubtful Accounts	Rents and Other Receivables Lease related receivables, which include contractual amounts accrued and unpaid from tenants and accrued straight-line rents receivable, are reduced for credit losses. Such amounts are recognized as a reduction to real estate rental revenues. We evaluate the collectability of lease receivables monthly using several factors including a lessee’s creditworthiness. We recognize the credit loss on lease related receivables when, in the opinion of management, collection of substantially all lease payments is not probable. When collectability is determined not probable, any lease income recognized subsequent to recognizing the credit loss is limited to the lesser of the lease income reflected on a straight-line basis or cash collected. The adoption of ASU 2016-02 resulted in an adjustment to our opening distributions in excess of net income balance of $0.9 million , associated with lease related receivables where collection of substantially all operating lease payments was not probable as of January 1, 2019. Rents and other receivables on the consolidated balance sheet is net of allowance for doubtful accounts of $2.4 million as of December 31, 2018 .
Debt Issuance Costs	Debt Issuance Costs
Deferred Leasing Costs	Deferred Leasing Costs We capitalize and amortize direct and incremental costs associated with the successful negotiation of leases, both external commissions and internal direct costs, on a straight-line basis over the terms of the respective leases. We record the amortization of deferred leasing costs in Depreciation and amortization on the consolidated statements of operations. If an applicable lease terminates prior to the expiration of its initial lease term, we write off the carrying amount of the costs to amortization expense. We capitalize and amortize against revenue leasing incentives associated with the successful negotiation of leases on a straight-line basis over the terms of the respective leases. We record the amortization of deferred leasing incentives as a reduction of revenue. If an applicable lease terminates prior to the expiration of its initial lease term, we write off the carrying amount of the costs as a reduction of revenue.
Real Estate and Depreciation	Real Estate and Depreciation We depreciate buildings on a straight-line basis over estimated useful lives ranging from 28 to 50 years. We capitalize all capital improvements associated with replacements, improvements or major repairs to real property that extend its useful life and depreciate them using the straight-line method over their estimated useful lives ranging from 3 to 30 years. We also capitalize costs incurred in connection with our development projects, including interest incurred on borrowing obligations and other internal costs during periods in which qualifying expenditures have been made and activities necessary to get the development projects ready for their intended use are in progress. Capitalization of these costs begins when the activities and related expenditures commence and ceases when the project is substantially complete and ready for its intended use, at which time the project is placed into service and depreciation commences. In addition, we capitalize tenant leasehold improvements when certain criteria are met, including when we supervise construction and will own the improvements. We depreciate all tenant improvements over the shorter of the useful life of the improvements or the term of the related tenant lease. Real estate depreciation expense from continuing operations was $101.7 million , $82.9 million and $81.0 million during the years ended December 31, 2019 , 2018 and 2017, respectively. We charge maintenance and repair costs that do not extend an asset’s useful life to expense as incurred. Interest expense from continuing operations and interest capitalized to real estate assets related to development and major renovation activities for the three years ended December 31, 2019 were as follows (in thousands): Year Ended December 31, 2019 2018 2017 Total interest incurred $ 56,948 $ 52,592 $ 47,757 Capitalized interest (3,214 ) (2,091 ) (964 ) Interest expense, net of capitalized interest $ 53,734 $ 50,501 $ 46,793 We recognize impairment losses on long-lived assets used in operations, development assets or land held for future development, if indicators of impairment are present and the net undiscounted cash flows estimated to be generated by those assets are less than the assets' carrying amount. Estimates of undiscounted cash flows are based on forward-looking assumptions, including annual and residual cash flows and our estimated holding period for each property. Such assumptions involve a high degree of judgment and could be affected by future economic and market conditions. When determining if a property has indicators of impairment, we evaluate the property's occupancy, our expected holding period for the property, strategic decisions regarding the property's future operations or development and other market factors. If such carrying amount is in excess of the estimated undiscounted cash flows from the operation and disposal of the property, we would recognize an impairment loss equivalent to an amount required to adjust the carrying amount to its estimated fair value, calculated in accordance with current GAAP fair value provisions. Assets held for sale are recorded at the lower of cost or fair value less costs to sell. Acquisitions The properties we acquire typically are not businesses as defined by ASU 2017-01, Business Combinations (Topic 805) - Clarifying the Definition of a Business . Per this definition, a set of transferred assets and activities is not a business when substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets. We therefore account for such acquisitions as asset acquisitions. Acquisition costs are capitalized and identifiable assets (including physical assets and in-place leases), liabilities assumed and any noncontrolling interests are measured by allocating the cost of the acquisition on a relative fair value basis. Acquisitions executed prior to our adoption of ASU 2017-01 as of January 1, 2017 were accounted for as business combinations. We determine the fair values of acquired buildings on an “as-if-vacant” basis considering a variety of factors, including the replacement cost of the property, estimated rental and absorption rates, estimated future cash flows and valuation assumptions consistent with current market conditions. We determine the fair value of land acquired based on comparisons to similar properties that have been recently marketed for sale or sold. The fair value of in-place leases consists of the following components – (a) the estimated cost to us to replace the leases, including foregone rents during the period of finding a new tenant and foregone recovery of tenant pass-throughs (referred to as “absorption cost”); (b) the estimated cost of tenant improvements, and other direct costs associated with obtaining a new tenant (referred to as “tenant origination cost”); (c) estimated leasing commissions associated with obtaining a new tenant (referred to as “leasing commissions”); (d) the above/at/below market cash flow of the leases, determined by comparing the projected cash flows of the leases in place, including consideration of renewal options, to projected cash flows of comparable market-rate leases (referred to as “net lease intangible”); and (e) the value, if any, of customer relationships, determined based on our evaluation of the specific characteristics of each tenant’s lease and our overall relationship with the tenant (referred to as “customer relationship value”). We have attributed no value to customer relationships as of December 31, 2019 and 2018 . We discount the amounts used to calculate net lease intangibles using an interest rate which reflects the risks associated with the leases acquired. We classify tenant origination costs as income producing property on our consolidated balance sheets and amortize the tenant origination costs as depreciation expense on a straight-line basis over the remaining life of the underlying leases. We classify leasing commissions and absorption costs as other assets and amortize leasing commissions and absorption costs as amortization expense on a straight-line basis over the remaining life of the underlying leases. We classify net lease intangible assets as other assets and amortize them on a straight-line basis as a decrease to real estate rental revenue over the remaining term of the underlying leases. We classify net lease intangible liabilities as other liabilities and amortize them on a straight-line basis as an increase to real estate rental revenue over the remaining term of the underlying leases. If any of the fair value of below market lease intangibles includes fair value associated with a renewal option, such amounts are not amortized until the renewal option is executed, else the related value is expensed at that time. Should a tenant terminate its lease prior to the expiration date, we accelerate the amortization of the unamortized portion of the tenant origination cost, leasing commissions, absorption costs and net lease intangible associated with that lease, over its new, shorter term.
Software Developed for Internal Use	Software Developed for Internal Use The costs of software developed for internal use that qualify for capitalization are included with Prepaid expenses and other assets on our consolidated balance sheets. These capitalized costs include external direct costs utilized in developing or obtaining the applications and expenses for employees who are directly associated with the development of the applications. Capitalization of such costs begins when the preliminary project stage is complete and continues until the project is substantially complete and is ready for its intended purpose. Completed projects are amortized on a straight-line basis over their estimated useful lives.
Held for Sale and Discontinued Operations	Held for Sale and Discontinued Operations We classify properties as held for sale when they meet the necessary criteria, which include: (a) senior management commits to a plan to sell the assets, (b) the assets are available for immediate sale in their present condition subject only to terms that are usual and customary for sales of such assets, (c) an active program to locate a buyer and other actions required to complete the plan to sell the assets have been initiated, (d) the sale of the assets is probable, and transfer of the assets is expected to qualify for recognition as a completed sale, within one year, (e) the assets are being actively marketed for sale at a price that is reasonable in relation to its current fair value and (f) actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. Depreciation on these properties is discontinued at the time they are classified as held for sale, but operating revenues, operating expenses and interest expense continue to be recognized until the date of sale. Revenues and expenses of properties that are either sold or classified as held for sale are presented as discontinued operations for all periods presented in the consolidated statements of operations if the dispositions represent a strategic shift that has (or will have) a major effect on our operations and financial results. Interest on debt that can be identified as specifically attributed to these properties is included in discontinued operations. If the dispositions do not represent a strategic shift that has (or will have) a major effect on our operations and financial results, then the revenues and expenses of the properties that are classified as sold or held for sale are presented as continuing operations in the consolidated statements of operations for all periods presented.
Segments	Segments We evaluate performance based upon net operating income from the combined properties in each segment. Our reportable operating segments are consolidations of similar properties. GAAP requires that segment disclosures present the measure(s) used by the chief operating decision maker for purposes of assessing segments’ performance. Net operating income is a key measurement of our segment profit and loss. Net operating income is defined as segment real estate rental revenue less segment real estate expenses.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash and commercial paper with original maturities of 90 days or less. We maintain cash deposits with financial institutions that at times exceed applicable insurance limits. We reduce this risk by maintaining such deposits with high quality financial institutions that management believes are credit-worthy.
Restricted Cash	Restricted Cash Restricted cash includes funds escrowed for tenant security deposits, real estate tax, insurance and mortgage escrows and escrow deposits required by lenders on certain of our properties to be used for future building renovations or tenant improvements.
Earnings Per Common Share	Earnings Per Common Share We determine “Basic earnings per share” using the two-class method as our unvested restricted share awards and units have non-forfeitable rights to dividends, and are therefore considered participating securities. We compute basic earnings per share by dividing net income attributable to the controlling interest less the allocation of undistributed earnings to unvested restricted share awards and units by the weighted-average number of common shares outstanding for the period. We also determine “Diluted earnings per share” under the two-class method with respect to the unvested restricted share awards. We further evaluate any other potentially dilutive securities at the end of the period and adjust the basic earnings per share calculation for the impact of those securities that are dilutive. Our dilutive earnings per share calculation includes the dilutive impact of operating partnership units under the if-converted method and our share based awards with performance conditions prior to the grant date and all market condition awards under the contingently issuable method.
Stock Based Compensation	Stock Based Compensation We currently maintain equity based compensation plans for trustees, officers and employees. We recognize compensation expense for service-based share awards ratably over the period from the service inception date through the vesting period based on the fair market value of the shares on the date of grant. We account for forfeitures as they occur. If an award's service inception date precedes the grant date, we initially measure compensation expense for awards with performance conditions at fair value at the service inception date based on probability of payout, and we remeasure compensation expense at subsequent reporting dates until all of the award’s key terms and conditions are known and the grant date is established. We amortize awards with performance conditions using the graded expense method. We measure compensation expense for awards with market conditions based on the grant date fair value, as determined using a Monte Carlo simulation, and we amortize the expense ratably over the requisite service period, regardless of whether the market conditions are achieved and the awards ultimately vest. Compensation expense for the trustee grants, which fully vest immediately, is fully recognized upon issuance based upon the fair market value of the shares on the date of grant.
Accounting for Uncertainty in Income Taxes	Accounting for Uncertainty in Income Taxes We can recognize a tax benefit only if it is “more likely than not” that a particular tax position will be sustained upon examination or audit. To the extent that the “more likely than not” standard has been satisfied, the benefit associated with a tax position is measured as the largest amount that is greater than 50% likely of being recognized upon settlement. As of December 31, 2019 and 2018 , we did not have any unrecognized tax benefits. We do not believe that there will be any material changes to our uncertain tax positions over the next twelve months. We are subject to federal income tax as well as income tax of the states of Maryland and Virginia, and the District of Columbia. However, as a REIT, we generally are not subject to income tax on our taxable income to the extent it is distributed as dividends to our shareholders. Tax returns filed for 2015 through 2019 tax years are subject to examination by taxing authorities. We classify interest and penalties related to uncertain tax positions, if any, in our financial statements as a component of general and administrative expense.
Derivatives	Derivatives We borrow funds at a combination of fixed and variable rates. Borrowings under our revolving credit facility and term loans bear interest at variable rates. Our interest rate risk management objectives are to minimize interest rate fluctuation on long-term indebtedness and limit the impact of interest rate changes on earnings and cash flows. To achieve these objectives, from time to time, we may enter into interest rate hedge contracts such as collars, swaps, caps and treasury lock agreements in order to mitigate our interest rate risk with respect to various debt instruments. We generally do not hold or issue these derivative contracts for trading or speculative purposes. The interest rate swaps we enter into are recorded at fair value on a recurring basis. We assess effectiveness of our cash flow hedges both at inception and on an ongoing basis. The effective portion of changes in fair value of the interest rate swaps associated with our cash flow hedges is recorded in accumulated other comprehensive income (loss). Our cash flow hedges become ineffective if critical terms of the hedging instrument and the debt instrument such as notional amounts, settlement dates, reset dates, calculation period and LIBOR do not perfectly match. In addition, we evaluate the default risk of the counterparty by monitoring the creditworthiness of the counterparty. When ineffectiveness of a cash flow hedge exists, the ineffective portion of changes in fair value of the interest rate swaps associated with our cash flow hedges is recognized in earnings in the period affected.

Nature of Business (Tables)

Nature of Business (Tables)	12 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Properties Sold	During the three years ended December 31, 2019 , we sold our interests in the following properties (in thousands): Disposition Date Property Type (Loss) Gain on Sale June 26, 2019 Quantico Corporate Center (1) Office $ (1,046 ) July 23, 2019 Shopping Center Portfolio (2) Retail 333,023 August 21, 2019 Frederick Crossing and Frederick County Square Retail 9,507 August 27, 2019 Centre at Hagerstown Retail (3,506 ) December 19, 2019 1776 G Street Office 61,007 Total 2019 $ 398,985 January 19, 2018 Braddock Metro Center Office $ — June 28, 2018 2445 M Street Office 2,495 Total 2018 $ 2,495 October 23, 2017 Walker House Apartments Multifamily $ 23,838 Total 2017 $ 23,838 ______________________________ (1) Consists of 925 and 1000 Corporate Drive. (2) Consists of five retail properties: Gateway Overlook, Wheaton Park, Olney Village Center, Bradlee Shopping Center and Shoppes of Foxchase.
Schedule of Breakdown of Taxable Percentage of Dividends	The following is a breakdown of the taxable percentage of our dividends for the years ended December 31, 2019, 2018 and 2017 (unaudited): 2019 2018 2017 Ordinary income/Section 199A dividends 80 % 29 % 76 % Return of capital 20 % 71 % — % Qualified dividends — % — % 2 % Unrecaptured Section 1250 gain — % — % 8 % Capital gain — % — % 14 %

Summary of Significant Accoun_3

Summary of Significant Accounting Policies and Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Schedule of Recent Accounting Standards	Recent Accounting Standards Standards Adopted Standard/Description Effective Date and Adoption Considerations Effect on Financial Statements or Other significant Matters ASU 2016-02, Leases (Topic 842) . This standard amends existing lease accounting standards for both lessees and lessors. Lessees must classify most leases as either finance or operating leases. For lease contracts, or contracts with an embedded lease, with a duration of more than one year in which we are the lessee, the present value of future lease payments are recognized on our consolidated balance sheets as a right-of-use asset and a corresponding lease liability. Lessors Lease contracts currently classified as operating leases are accounted for similarly to prior guidance. However, lessors are required to account for each lease and non-lease component, such as common area maintenance or tenant service revenues, of a contract separately. In July 2018, the FASB issued 2018-11, Leases (Topic 842) - Targeted Improvements (“ASU 2018-11”), which provides lessors optional transition relief from implementing this aspect of ASU 2016-02 if the following criteria are met: (1) both components have the same timing and pattern of revenue and (2) if accounted for separately, both components would be classified as an operating lease. Also, under ASU 2016-02, only incremental costs or initial direct costs of executing a lease contract qualify for capitalization, while prior accounting standards allowed for the capitalization of indirect leasing costs. We adopted the new standard as of January 1, 2019. We adopted ASU 2016-02 as of January 1, 2019 using the modified retrospective approach and by applying the transitional practical expedients noted below. Under the modified retrospective approach, we recognized a cumulative effect adjustment of $0.9 million to distributions in excess of net income as of January 1, 2019 (see note 4 for further discussion of the impact of adoption on our consolidated financial statements). We did not elect the hindsight expedient, which would have allowed us to reevaluate lease terms in calculating lease liabilities as part of adoption. We elected not to bifurcate lease contracts into lease and non-lease components, since: (1) the timing and pattern of revenue is not materially different and the non-lease components are not the primary component of the lease, and (2) the lease component, if accounted for separately, would be classified as an operating lease. Accordingly, both lease and non-lease components are presented in “Real estate rental revenue” in our consolidated financial statements. The adoption of ASU 2016-02 did not result in a material change to our recognition of real estate rental revenue. New Accounting Standards Issued But Not Yet Effective Standard/Description Effective Date and Adoption Considerations Effect on Financial Statements or Other significant Matters ASU 2016-13, Measurement of Credit Losses on Financial Instruments . This standard requires financial assets measured at an amortized cost basis, including trade receivables, to be presented at the net amount expected to be collected. This standard does not apply to receivables arising from operating leases accounted for in accordance with Topic 842. We adopted the new standard as of January 1, 2020. The adoption of the new standard did not have a material impact on our consolidated financial statements. ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software . This standard requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance to determine which implementation costs to capitalize as assets. We adopted the new standard as of January 1, 2020. The adoption of the new standard did not have a material impact on our consolidated financial statements.
Schedule of Interest and Interest Capitalized	Interest expense from continuing operations and interest capitalized to real estate assets related to development and major renovation activities for the three years ended December 31, 2019 were as follows (in thousands): Year Ended December 31, 2019 2018 2017 Total interest incurred $ 56,948 $ 52,592 $ 47,757 Capitalized interest (3,214 ) (2,091 ) (964 ) Interest expense, net of capitalized interest $ 53,734 $ 50,501 $ 46,793

Real Estate (Tables)

Real Estate (Tables)	12 Months Ended
	Dec. 31, 2019
Real Estate [Abstract]
Schedule of Real Estate Investment Portfolio	As of December 31, 2019 and 2018 , our real estate investment portfolio classified as income producing property that is held and used, at cost, consists of properties as follows (in thousands): December 31, 2019 2018 Multifamily $ 1,469,011 $ 919,285 Office 1,329,722 1,507,986 Other (1) 160,489 154,650 $ 2,959,222 $ 2,581,921 ______________________________ (1) Consists of the retail properties not classified as discontinued operations: Takoma Park, Westminster, Concord Centre, Chevy Chase Metro Plaza, 800 S. Washington Street, Randolph Shopping Center, Montrose Shopping Center and Spring Valley Village.
Schedule of Costs of Real Estate Portfolio Under Development of Held for Future Development	The cost of our real estate portfolio under development or held for future development as of December 31, 2019 and 2018 is as follows (in thousands): December 31, 2019 2018 Multifamily $ 123,071 $ 83,945 Office 478 478 Other 644 2,808 $ 124,193 $ 87,231
Schedule of Real Estate Properties Acquired	Properties and land for development acquired during the three years ended December 31, 2019 were as follows: Acquisition Date Property Type # of units (unaudited) Rentable Square Feet (unaudited) Contract Purchase Price (in thousands) April 30, 2019 Assembly Portfolio - Virginia (1) Multifamily 1,685 N/A $ 379,100 June 27, 2019 Assembly Portfolio - Maryland (2) Multifamily 428 N/A 82,070 July 23, 2019 Cascade at Landmark Multifamily 277 N/A 69,750 2,390 $ 530,920 January 18, 2018 Arlington Tower Office N/A 391,000 $ 250,000 April 4, 2017 Watergate 600 Office N/A 293,000 $ 135,000 ______________________________ (1) Consists of Assembly Alexandria, Assembly Manassas, Assembly Dulles, Assembly Leesburg, and Assembly Herndon. (2) Consists of Assembly Germantown and Assembly Watkins Mill. The Assembly Portfolio - Virginia and Assembly Portfolio - Maryland properties are collectively the “Assembly Portfolio.”
Schedule of Revenue and Earnings from Acquired Operating Properties	The revenue and earnings of our acquisitions during their year of acquisition for the three years ended December 31, 2019 are as follows (in thousands): Year Ended December 31, 2019 2018 2017 Real estate rental revenue $ 27,641 $ 22,389 $ 14,518 Net (loss) income (10,167 ) 3,623 2,226
Schedule of Recorded Cost of Asset Acquisitions	We recorded the total cost of the above acquisitions as follows (in thousands): 2019 2018 2017 Land $ 92,391 $ 63,970 $ 45,981 Buildings and improvements 423,663 142,900 66,241 Tenant origination costs — 13,625 12,084 Leasing commissions/absorption costs 15,474 27,465 23,161 Net lease intangible assets — 3,142 498 Net lease intangible liabilities — (545 ) (9,585 ) Deferred tax liability — — (560 ) Total $ 531,528 $ 250,557 $ 137,820
Schedule of Components of Fair Value of In-Place Leases	Balances, net of accumulated depreciation or amortization, as appropriate, of the components of the fair value of in-place leases at December 31, 2019 and 2018 were as follows (in thousands): December 31, 2019 2018 Gross Carrying Value Accumulated Amortization Net Gross Carrying Value Accumulated Amortization Net Tenant origination costs $ 50,155 $ 33,364 $ 16,791 $ 57,897 $ 36,570 $ 21,327 Leasing commissions/absorption costs 122,348 92,401 29,947 114,354 77,194 37,160 Net lease intangible assets 15,183 11,964 3,219 16,353 11,947 4,406 Net lease intangible liabilities 29,836 20,854 8,982 31,124 20,016 11,108 Below-market ground lease intangible asset 12,080 2,282 9,798 12,080 2,093 9,987 Amortization of these combined components during the three years ended December 31, 2019 , 2018 and 2017 was as follows (in thousands): Year Ended December 31, 2019 2018 2017 Depreciation and amortization expense $ 27,123 $ 22,361 $ 13,996 Real estate rental revenue increase, net (924 ) (1,225 ) (776 ) $ 26,199 $ 21,136 $ 13,220
Schedule of Future Amortization of Components of Fair Value of In-Place Leases	Amortization of these combined components over the next five years is projected to be as follows (in thousands): Depreciation and amortization expense Real estate rental revenue, net increase Total 2020 $ 9,975 $ (406 ) $ 9,569 2021 8,576 (547 ) 8,029 2022 8,078 (736 ) 7,342 2023 6,032 (974 ) 5,058 2024 5,264 (862 ) 4,402 Thereafter 18,611 (2,238 ) 16,373
Schedule of Properties Held-for-Sale or Sold and Discontinued Operations	We classified as held for sale or sold our interests in the following properties during the three years ended December 31, 2019 : Disposition Date Property Type # of units (unaudited) Rentable Contract (Loss) Gain on Sale June 26, 2019 Quantico Corporate Center (1) Office N/A 272,000 $ 33,000 $ (1,046 ) July 23, 2019 Shopping Center Portfolio (2) Retail N/A 800,000 485,250 333,023 August 21, 2019 Frederick Crossing and Frederick County Square Retail N/A 520,000 57,500 9,507 August 27, 2019 Centre at Hagerstown Retail N/A 330,000 23,500 (3,506 ) December 19, 2019 1776 G Street Office N/A 262,000 129,500 61,007 N/A John Marshall II Office N/A 223,000 63,350 N/A Total 2019 2,407,000 $ 792,100 $ 398,985 January 19, 2018 Braddock Metro Center Office N/A 356,000 $ 93,000 $ — June 28, 2018 2445 M Street Office N/A 292,000 101,600 2,495 Total 2018 648,000 $ 194,600 $ 2,495 October 23, 2017 Walker House Apartments Multifamily 212 N/A $ 32,200 $ 23,838 Total 2017 $ 32,200 $ 23,838 ______________________________ (1) Consists of 925 and 1000 Corporate Drive. (2) Consists of five retail properties: Gateway Overlook, Wheaton Park, Olney Village Center, Bradlee Shopping Center and Shoppes of Foxchase. The results of the Retail Portfolio are classified as discontinued operations and are summarized as follows (amounts in thousands, except for share data): 2019 2018 2017 Real estate rental revenue $ 28,200 $ 45,160 $ 44,797 Real estate expenses (6,803 ) (10,638 ) (10,251 ) Depreciation and amortization (4,926 ) (9,402 ) (10,626 ) Interest expense (313 ) (643 ) (740 ) Loss on extinguishment of debt (764 ) — — Gain on sale of real estate 339,024 — — Income from discontinued operations $ 354,418 $ 24,477 $ 23,180 Basic net income per share $ 4.39 $ 0.31 $ 0.30 Diluted net income per share $ 4.39 $ 0.31 $ 0.30 Capital expenditures $ 809 $ 2,138 $ 1,601 All assets related to the Retail Portfolio were sold as of December 31, 2019. As of December 31, 2018, assets related to the Retail Portfolio were as follows (in thousands): Land $ 88,087 Income producing property 216,577 304,664 Accumulated depreciation and amortization (101,254 ) Income producing property, net 203,410 Rents and other receivables 9,898 Prepaid expenses and other assets 8,653 Total assets $ 221,961 All liabilities related to the Retail Portfolio were sold as of December 31, 2019. As of December 31, 2018, liabilities related to the Retail Portfolio were as follows (in thousands): Mortgage notes payable, net $ 11,515 Accounts payable and other liabilities 1,620 Advance rents 1,771 Tenant security deposits 612 Liabilities related to properties sold or held for sale $ 15,518

Lease Accounting (Tables)

Lease Accounting (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Schedule of Future Minimum Rental Income	As of December 31, 2019 , non-cancelable commercial operating leases provide for future minimum rental income from continuing operations as follows (in thousands): 2020 $ 139,053 2021 133,907 2022 120,491 2023 102,877 2024 91,253 Thereafter 301,974 $ 889,555
Schedule of Obligations for Future Minimum Payments on Operating Ground Lease	The following table sets forth the undiscounted cash flows of our scheduled obligations for future minimum payments on our operating ground lease as of December 31, 2019 and a reconciliation of those cash flows to the operating lease liability as of December 31, 2019 (in thousands): 2020 $ 260 2021 260 2022 260 2023 260 2024 260 Thereafter 11,895 13,195 Imputed interest (9,225 ) Lease liability $ 3,970

Mortgage Note Payable (Tables)

Mortgage Note Payable (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Schedule of Outstanding Mortgage Notes Payable	As of December 31, 2019 and 2018 , we had outstanding mortgage notes payable, collateralized by a building and related land from our portfolio, as follows (in thousands): December 31, Properties Assumption/Issuance Date (1) Effective Interest Rate (2) 2019 2018 Payoff Date Yale West (3) 2/21/2014 3.75 % $ 45,654 $ 46,155 1/31/2020 Premiums and discounts, net 1,470 2,187 Debt issuance costs, net (50 ) (65 ) $ 47,074 $ 48,277 ______________________________ (1) This mortgage was assumed with the acquisition of the collateralized property. We record mortgages assumed in an acquisition at fair value. (2) Yield on the assumption/issuance date, including the effects of any premiums, discounts or fair value adjustments on the notes. (3) The maturity date of the mortgage note was January 1, 2052, but was prepaid in January 2020. We incurred a gain on extinguishment of debt of $0.5 million in association with this prepayment.

Unsecured Lines of Credit Pay_2

Unsecured Lines of Credit Payable (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Schedule of Revolving Credit Facilities Covenant Compliance	Information related to revolving credit facilities for the three years ended December 31, 2019 as follows (in thousands, except percentage amounts): Year Ended December 31, 2019 2018 2017 Total revolving credit facilities at December 31 $ 700,000 $ 700,000 $ 600,000 Borrowings outstanding at December 31 56,000 188,000 166,000 Weighted average daily borrowings during the year 196,074 230,934 179,633 Maximum daily borrowings during the year 300,000 429,000 252,000 Weighted average interest rate during the year 3.34 % 2.96 % 2.15 % Weighted average interest rate on borrowings outstanding at December 31 2.73 % 3.52 % 2.54 % The amount of the Revolving Credit Facility unused and available at December 31, 2019 was as follows (in thousands): Committed capacity $ 700,000 Borrowings outstanding (56,000 ) Unused and available $ 644,000 We executed borrowings and repayments on the Revolving Credit Facility during 2019 as follows (in thousands): Balance at December 31, 2018 $ 188,000 Borrowings 687,000 Repayments (819,000 ) Balance at December 31, 2019 $ 56,000 For the three years ended December 31, 2019 , we recognized interest expense (excluding facility fees) and facility fees as follows (in thousands): Year Ended December 31, 2019 2018 2017 Interest expense (excluding facility fees) $ 6,554 $ 6,843 $ 3,857 Facility fees 1,400 1,371 1,217

Notes Payable (Tables)

Notes Payable (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Schedule of Unsecured Notes and Term Loans Outstanding	Our unsecured notes and term loans outstanding as of December 31, 2019 and 2018 are as follows (in thousands): Effective December 31, Payoff Date/ Coupon/Stated Rate Rate (1) 2019 2018 Maturity Date (2) 10 Year Unsecured Notes 4.95 % 5.05 % 250,000 $ 250,000 10/1/2020 2015 Term Loan 1 Month LIBOR + 110 basis points 2.72 % 150,000 150,000 3/15/2021 10 Year Unsecured Notes 3.95 % 4.02 % 300,000 300,000 10/15/2022 2018 Term Loan (3) 1 Month LIBOR + 110 basis points 2.87 % 250,000 250,000 7/21/2023 30 Year Unsecured Notes 7.25 % 7.36 % 50,000 50,000 2/25/2028 Total principal 1,000,000 1,000,000 Premiums and discounts, net (797 ) (1,189 ) Deferred issuance costs, net (2,481 ) (3,414 ) Total $ 996,722 995,397 ______________________________ (1) For fixed rate notes, the effective rate represents the yield on issuance date, including the effects of discounts on the notes. For variable rate notes, the effective rate represents the rate as fixed by interest rate derivatives (see note 8 ). (2) No principal amounts are due prior to maturity. (3) The 2018 Term Loan increased and replaced the 2016 Term Loan (see note 6).
Schedule of Principal Payments on Debt	The required principal payments on the unsecured notes and term loans as of December 31, 2019 are as follows (in thousands): 2020 $ 250,000 2021 150,000 2022 300,000 2023 250,000 2024 — Thereafter 50,000 $ 1,000,000

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The fair values of the interest rate swaps as of December 31, 2019 and 2018 , are as follows (in thousands): Aggregate Notional Amount Effective Date Fair Value Derivative Assets (Liabilities) December 31, Derivative Instrument Maturity Date 2019 2018 Interest rate swaps $ 150,000 October 15, 2015 March 15, 2021 $ (62 ) $ 2,720 Interest rate swaps 150,000 March 31, 2017 July 21, 2023 1,825 7,918 Interest rate swaps 100,000 June 29, 2018 July 21, 2023 (3,664 ) (799 ) Interest rate swaps 200,000 April 1, 2020 April 1, 2030 3,724 — $ 600,000 $ 1,823 $ 9,839 We record interest rate swaps on our consolidated balance sheets with prepaid expenses and other assets when in a net asset position, and with accounts payable and other liabilities when in a net liability position. The interest rate swaps have been effective since inception. The gains or losses on the effective swaps are recognized in other comprehensive income, as follows (in thousands): Year Ending December 31, 2019 2018 2017 Unrealized (loss) gain on interest rate hedges $ (8,016 ) $ 420 $ 1,808

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Financial Assets And Liabilities Measured At Fair Value	The fair values of these assets and liabilities at December 31, 2019 and 2018 were as follows (in thousands): December 31, 2019 December 31, 2018 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: SERP $ 1,792 $ — $ 1,792 $ — $ 1,364 $ — $ 1,364 $ — Interest rate swaps 5,549 — 5,549 — 10,638 — 10,638 — Liabilities: Interest rate swaps (3,726 ) — (3,726 ) — (799 ) — (799 ) —
Schedule of Carrying Value and Estimated Fair Value of Financial Instruments	As of December 31, 2019 and 2018 , the carrying values and estimated fair values of our financial instruments were as follows (in thousands): December 31, 2019 2018 Carrying Value Fair Value Carrying Value Fair Value Cash and cash equivalents $ 12,939 $ 12,939 $ 6,016 $ 6,016 Restricted cash 1,812 1,812 1,624 1,624 Mortgage notes payable 47,074 47,899 48,277 48,368 Line of credit payable 56,000 56,000 188,000 188,000 Notes payable 996,722 1,022,937 995,397 1,015,210

Stock Based Compensation (Table

Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The assumptions used to value the officer LTIP awards were as follows: 2019 Awards 2018 Awards 2017 Awards Expected volatility (1) 18.1 % 17.9 % 18.5% - 18.7% Risk-free interest rate (2) 2.4 % 2.4 % 1.5 % Expected term (3) 3 and 4 years 3 and 4 years 3 and 4 years Share price at grant date $23.00 $26.06 $30.84 - $32.69 (1) Expected volatility based upon historical volatility of our daily closing share price. (2) Risk-free interest rate based on U.S. treasury constant maturity bonds on the measurement date with a maturity equal to the market condition performance period. (3) Expected term based on the market condition performance period.
Schedule of Restricted Share Awards	The activity for the three years ended December 31, 2019 related to our restricted share awards, excluding those subject to market conditions, was as follows: Shares Wtd Avg Grant Fair Value Unvested at December 31, 2016 107,699 $ 26.47 Granted 330,639 32.46 Vested during year (194,569 ) 30.50 Forfeited (7,075 ) 27.43 Unvested at December 31, 2017 236,694 27.96 Granted 304,087 25.98 Vested during year (224,150 ) 27.40 Forfeited (5,621 ) 29.43 Unvested at December 31, 2018 311,010 29.07 Granted 213,782 26.26 Vested during year (236,013 ) 27.43 Forfeited (19,396 ) 26.60 Unvested at December 31, 2019 269,383 28.45
Performance Share Units with Market Conditions	Stock based awards with market conditions under the LTIP were granted in 2019 , 2018 and 2017 with fair market values, as determined using a Monte Carlo simulation, as follows (in thousands): Grant Date Fair Value 2019 Awards 2018 Awards 2017 Awards Restricted Unrestricted Restricted Unrestricted Restricted Unrestricted Relative Peer TSR $ 184 $ 552 $ 203 $ 608 $ 222 $ 666 Absolute/Index TSR (1) 201 602 230 690 100 299
Schedule Of Unamortized Value Of Awards With Market Conditions	The unamortized value of these awards with market conditions as of December 31, 2019 was as follows (in thousands): 2019 Awards 2018 Awards 2017 Awards Restricted Unrestricted Restricted Unrestricted Restricted Unrestricted Relative Peer TSR $ 138 $ 368 $ 85 $ 171 $ 44 $ — Absolute/Index TSR (1) 151 401 96 194 20 — ______________________________ (1) The performance conditions for the 2019 and 2018 awards were evaluated based on 50% on TSR relative to a defined population of peer companies and 50% on TSR relative to the FTSE NAREIT Diversified Index. The performance condition for the 2017 awards was evaluated based 50% on absolute TSR and 50% on relative TSR.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	The computation of basic and diluted earnings per share for the three years ended December 31, 2019 was as follows (in thousands; except per share data): Year Ended December 31, 2019 2018 2017 Numerator: Income (loss) from continuing operations $ 29,132 $ 1,153 $ (3,568 ) Net loss attributable to noncontrolling interests — — 56 Allocation of losses (earnings) from continuing operations to unvested restricted share awards (125 ) (526 ) (362 ) Adjusted income (loss) from continuing operations attributable to the controlling interests 29,007 627 (3,874 ) Income from discontinued operations, including gain on sale of real estate 354,418 24,477 23,180 Net loss attributable to noncontrolling interests — — — Allocation of earnings from discontinued operations to unvested restricted share awards (1,837 ) — — Adjusted income from discontinued operations 352,581 24,477 23,180 Adjusted net income attributable to the controlling interests $ 381,588 $ 25,104 $ 19,306 Denominator: Weighted average shares outstanding – basic 80,257 78,960 76,820 Effect of dilutive securities: Operating partnership units 12 12 — Employee restricted share awards 66 70 — Weighted average shares outstanding – diluted 80,335 79,042 76,820 Earnings per common share, basic: Continuing operations $ 0.36 $ 0.01 $ (0.05 ) Discontinued operations 4.39 0.31 0.30 Basic net income attributable to the controlling interests per common share $ 4.75 $ 0.32 $ 0.25 Earnings per common share, diluted: Continuing operations $ 0.36 $ 0.01 $ (0.05 ) Discontinued operations 4.39 0.31 0.30 Diluted net income attributable to the controlling interests per common share $ 4.75 $ 0.32 $ 0.25 Dividends declared per common share $ 1.20 $ 1.20 $ 1.20

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Real Estate Rental Revenue, Percent	Real estate rental revenue as a percentage of the total for each of the reportable operating segments for the three years ended December 31, 2019 was as follows: Year Ended December 31, 2019 2018 2017 Multifamily 41 % 33 % 34 % Office 53 % 61 % 60 % Corporate and other 6 % 6 % 6 %
Percentage of Real Estate Assets by Segment	The percentage of income producing real estate assets classified as held and used, at cost, for each of the reportable operating segments as of December 31, 2019 and 2018 was as follows: December 31, 2019 2018 Multifamily 50 % 36 % Office 45 % 58 % Corporate and other 5 % 6 %
Reconciliation of Net Operating Income of Reportable Segments	The following tables present revenues, net operating income, capital expenditures and total assets for the three years ended December 31, 2019 from these segments, and reconciles net operating income of reportable segments to net income attributable to the controlling interests as reported (in thousands): Year Ended December 31, 2019 Office Multifamily Corporate (1) Consolidated Real estate rental revenue $ 164,059 $ 126,131 $ 18,990 $ 309,180 Real estate expenses 60,923 49,135 5,522 115,580 Net operating income $ 103,136 $ 76,996 $ 13,468 $ 193,600 Depreciation and amortization (136,253 ) General and administrative (24,370 ) Lease origination expenses (1,698 ) Interest expense (53,734 ) Real estate impairment (8,374 ) Gain on sale of real estate 59,961 Discontinued operations: Income from properties sold or held for sale 16,158 Gain on sale of real estate 339,024 Loss on extinguishment of debt (764 ) Net income 383,550 Less: Net loss attributable to noncontrolling interests — Net income attributable to the controlling interests $ 383,550 Capital expenditures $ 38,634 $ 25,779 $ 4,534 $ 68,947 Total assets $ 1,134,147 $ 1,340,634 $ 153,547 $ 2,628,328 Year Ended December 31, 2018 Office Multifamily Corporate and Other (1) Consolidated Real estate rental revenue $ 178,474 $ 95,194 $ 18,062 $ 291,730 Real estate expenses 63,321 37,235 5,036 105,592 Net operating income $ 115,153 $ 57,959 $ 13,026 $ 186,138 Depreciation and amortization (111,826 ) General and administrative (22,089 ) Real estate impairment (1,886 ) Interest expense (50,501 ) Gain on sale of real estate 2,495 Loss on extinguishment of debt (1,178 ) Discontinued operations: Income from properties sold or held for sale 24,477 Net income 25,630 Less: Net loss attributable to noncontrolling interests — Net income attributable to the controlling interests $ 25,630 Capital expenditures $ 42,019 $ 25,117 $ 4,897 $ 72,033 Total assets $ 1,248,673 $ 792,170 $ 376,261 $ 2,417,104 Year Ended December 31, 2017 Office Multifamily Corporate and Other (1) Consolidated Real estate rental revenue $ 167,438 $ 95,250 $ 17,593 $ 280,281 Real estate expenses 62,824 37,640 4,936 105,400 Net operating income $ 104,614 $ 57,610 $ 12,657 $ 174,881 Depreciation and amortization (101,430 ) General and administrative (22,580 ) Casualty gain (33,152 ) Interest expense (46,793 ) Other income 507 Gain on sale of real estate 24,915 Income tax benefit 84 Discontinued operations: Income from properties sold or held for sale 23,180 Net income 19,612 Less: Net loss attributable to noncontrolling interests 56 Net income attributable to the controlling interests $ 19,668 Capital expenditures $ 30,407 $ 27,980 $ 5,994 $ 64,381 Total assets $ 1,203,187 $ 767,279 $ 388,960 $ 2,359,426 ______________________________ (1) Includes the retail properties not classified as discontinued operations: Takoma Park, Westminster, Concord Centre, Chevy Chase Metro Plaza, 800 S. Washington Street, Randolph Shopping Center, Montrose Shopping Center and Spring Valley Village, and total assets and capital expenditures include all retail properties, including those classified as discontinued operations.

Selected Quarterly Financial _2

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	Unaudited financial data by quarter in each of the years ended December 31, 2019 and 2018 were as follows (in thousands, except for per share data): Quarter (1), (2) First Second Third Fourth 2019 Real estate rental revenue $ 71,434 $ 76,820 $ 80,259 $ 80,667 (Loss) income from continuing operations $ (10,443 ) $ (6,191 ) $ (8,432 ) $ 54,198 Net (loss) income $ (4,405 ) $ 987 $ 332,770 $ 54,198 Net (loss) income attributable to the controlling interests $ (4,405 ) $ 987 $ 332,770 $ 54,198 (Loss) income from continuing operations per share Basic $ (0.13 ) $ (0.08 ) $ (0.10 ) $ 0.66 Diluted $ (0.13 ) $ (0.08 ) $ (0.10 ) $ 0.66 Net income per share Basic $ (0.06 ) $ 0.01 $ 4.14 $ 0.66 Diluted $ (0.06 ) $ 0.01 $ 4.14 $ 0.66 2018 Real estate rental revenue $ 73,645 $ 75,344 $ 71,001 $ 71,740 (Loss) income from continuing operations $ (2,559 ) $ 4,563 $ (547 ) $ (304 ) Net income $ 3,299 $ 10,750 $ 5,893 $ 5,688 Net income attributable to the controlling interests $ 3,299 $ 10,750 $ 5,893 $ 5,688 Income (loss) from continuing operations per share Basic $ (0.03 ) $ 0.06 $ (0.01 ) $ — Diluted $ (0.03 ) $ 0.06 $ (0.01 ) $ — Net income per share Basic $ 0.04 $ 0.14 $ 0.07 $ 0.07 Diluted $ 0.04 $ 0.13 $ 0.07 $ 0.07 ______________________________ (1) With regard to per share calculations, the sum of the quarterly results may not equal full year results due to rounding. (2) The second quarter of 2019 includes a loss on sale of real estate of $1.0 million . The third and fourth quarters of 2019 include gains on sale of real estate of $339.0 million and $61.0 million , respectively. The second quarter of 2018 includes a gain on sale of real estate of $2.5 million . The first quarter of 2019 and first quarter of 2018 include real estate impairments of $8.4 million and $1.9 million

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Schedule of 2018 Equity Distribution Agreements	Our issuances and net proceeds on the 2018 Equity Distribution Agreements for the years ended December 31, 2019 and 2018 were as follows (in thousands; except per share data): Year Ended December 31, 2019 2018 Issuance of common shares 1,859 1,165 Weighted average price per share $ 30.00 $ 31.18 Net proceeds $ 54,916 $ 35,472
Schedule of Dividend Reinvestment Program	Our issuances and net proceeds on the dividend reinvestment program for the three years ended December 31, 2019 were as follows (in thousands; except per share data): Year Ended December 31, 2019 2018 2017 Issuance of common shares 173 81 80 Weighted average price per share $ 27.58 $ 29.18 $ 32.25 Net proceeds $ 4,755 $ 1,973 $ 2,576

Deferred Costs (Tables)

Deferred Costs (Tables)	12 Months Ended
	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Deferred Leasing Costs and Deferred Leasing Incentives	As of December 31, 2019 and 2018 , deferred leasing costs and deferred leasing incentives were included in prepaid expenses and other assets as follows (in thousands): December 31, 2019 2018 Gross Carrying Value Accumulated Amortization Net Gross Carrying Value Accumulated Amortization Net Deferred leasing costs $ 60,900 $ 29,580 $ 31,320 $ 63,659 $ 31,438 $ 32,221 Deferred leasing incentives 18,926 11,133 7,793 22,801 12,311 10,490
Schedule of Amortization and Write-offs of Deferred Leasing Costs and Deferred Leasing Incentives	Amortization, including write-offs, of deferred leasing costs and deferred leasing incentives for the three years ended December 31, 2019 were as follows (in thousands): Year Ended December 31, 2019 2018 2017 Deferred leasing costs amortization $ 6,599 $ 5,881 $ 5,784 Deferred leasing incentives amortization 2,862 2,811 3,009

Nature of Business - Narrative

Nature of Business - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)propertysegmentunit	Dec. 31, 2018USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of multifamily properties acquired | property	8
Number of units in multifamily properties acquired | unit	2,390
Number of retail properties sold | property	8
Number of retail properties sold that were identified for deferred exchange under Section 1031 | property	7
Number of reportable segments | segment	2
TRS
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred tax asset | $	$ 1.4	$ 1.4
Deferred tax asset valuation allowance | $	1.4	1.4
Deferred tax liabilities | $	$ 0.6	$ 0.6

Nature of Business - Properties

Nature of Business - Properties Sold (Details) - USD ($) $ in Thousands

Dec. 19, 2019

Aug. 27, 2019

Aug. 21, 2019

Jul. 23, 2019

Jun. 26, 2019

Jun. 28, 2018

Jan. 19, 2018

Oct. 23, 2017

Dec. 31, 2019

Sep. 30, 2019

Jun. 30, 2019

Jun. 30, 2018

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Properties Sold [Line Items]

(Loss) gain on sale

$ 339,000

$ 339,024

$ 0

$ 0

(Loss) gain on sale

$ 61,000

$ (1,000)

$ 2,500

59,961

2,495

24,915

2019 Properties

Properties Sold [Line Items]

(Loss) gain on sale

398,985

2019 Properties | Disposal group, not discontinued operations

Properties Sold [Line Items]

(Loss) gain on sale

$ 398,985

2019 Properties | Disposal group, not discontinued operations | Quantico Corporate Center | Office

Properties Sold [Line Items]

(Loss) gain on sale

$ (1,046)

2019 Properties | Disposal group, not discontinued operations | Shopping Center Portfolio

Properties Sold [Line Items]

(Loss) gain on sale

$ 333,000

2019 Properties | Disposal group, not discontinued operations | Frederick Crossing and Frederick County Square

Properties Sold [Line Items]

(Loss) gain on sale

$ 9,500

2019 Properties | Disposal group, not discontinued operations | Centre at Hagerstown

Properties Sold [Line Items]

(Loss) gain on sale

$ 3,500

2019 Properties | Disposal group, not discontinued operations | 1776 G Street | Office

Properties Sold [Line Items]

(Loss) gain on sale

$ 61,007

2019 Properties | Discontinued operations | Shopping Center Portfolio | Retail

Properties Sold [Line Items]

(Loss) gain on sale

$ 333,023

2019 Properties | Discontinued operations | Frederick Crossing and Frederick County Square | Retail

Properties Sold [Line Items]

(Loss) gain on sale

$ 9,507

2019 Properties | Discontinued operations | Centre at Hagerstown | Retail

Properties Sold [Line Items]

(Loss) gain on sale

$ (3,506)

2018 Properties

Properties Sold [Line Items]

(Loss) gain on sale

2,495

2018 Properties | Disposal group, not discontinued operations

Properties Sold [Line Items]

(Loss) gain on sale

$ 2,495

2018 Properties | Disposal group, not discontinued operations | Braddock Metro Center | Office

Properties Sold [Line Items]

(Loss) gain on sale

$ 0

2018 Properties | Disposal group, not discontinued operations | 2445 M Street | Office

Properties Sold [Line Items]

(Loss) gain on sale

$ 2,495

2017 Properties

Properties Sold [Line Items]

(Loss) gain on sale

23,838

2017 Properties | Disposal group, not discontinued operations

Properties Sold [Line Items]

(Loss) gain on sale

23,838

2017 Properties | Disposal group, not discontinued operations | Walker House Apartments | Multifamily

Properties Sold [Line Items]

(Loss) gain on sale

$ 23,838

$ 23,800

Nature of Business - Taxable Pe

Nature of Business - Taxable Percentage of Dividends (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Ordinary income/Section 199A dividends	80.00%	29.00%	76.00%
Return of capital	20.00%	71.00%	0.00%
Qualified dividends	0.00%	0.00%	2.00%
Unrecaptured Section 1250 gain	0.00%	0.00%	8.00%
Capital gain	0.00%	0.00%	14.00%

Summary of Significant Accoun_4

Summary of Significant Accounting Policies and Basis of Presentation - Revenue Recognition and Rents and Other Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Property Subject to or Available for Operating Lease [Line Items]
Cumulative effect adjustment upon adoption of new accounting standard		$ 906
Allowance for doubtful accounts			$ 2,400
Multifamily Properties
Property Subject to or Available for Operating Lease [Line Items]
Lessor, operating lease term of contract (in years)	1 year
Commercial Properties
Property Subject to or Available for Operating Lease [Line Items]
Lessor, operating lease term of contract (in years)	7 years
ASU 2016-02
Property Subject to or Available for Operating Lease [Line Items]
Cumulative effect adjustment upon adoption of new accounting standard		$ 900

Summary of Significant Accoun_5

Summary of Significant Accounting Policies and Basis of Presentation - Real Estate and Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Real estate depreciation	$ 101,700	$ 82,900	$ 81,000
Interest Expense
Total interest incurred	56,948	52,592	47,757
Capitalized interest	(3,214)	(2,091)	(964)
Interest expense, net of capitalized interest	$ 53,734	$ 50,501	$ 46,793
Minimum | Buildings
Property, Plant and Equipment [Line Items]
Useful life (in years)	28 years
Minimum | Building improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Useful life (in years)	50 years
Maximum | Building improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	30 years

Real Estate - Real Estate Inves

Real Estate - Real Estate Investment Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Real Estate [Line Items]
Income producing property, at cost	$ 2,959,222	$ 2,581,921
Properties under development or held for future development	124,193	87,231
Multifamily
Real Estate [Line Items]
Income producing property, at cost	1,469,011	919,285
Properties under development or held for future development	123,071	83,945
Office
Real Estate [Line Items]
Income producing property, at cost	1,329,722	1,507,986
Properties under development or held for future development	478	478
Other
Real Estate [Line Items]
Income producing property, at cost	160,489	154,650
Properties under development or held for future development	$ 644	$ 2,808

Real Estate - Acquisitions (Det

Real Estate - Acquisitions (Details) ft² in Thousands, $ in Thousands		Jul. 23, 2019USD ($)unit	Jun. 27, 2019USD ($)unit	Apr. 30, 2019USD ($)unit	Jan. 18, 2018USD ($)	Apr. 04, 2017USD ($)	Dec. 31, 2019USD ($)ft²unit	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Real Estate [Line Items]
Rentable Square Feet (sq ft) | ft²	[1]						9,726
Contract Purchase Price								$ 250,000	$ 135,000
Multifamily
Real Estate [Line Items]
Rentable Square Feet (sq ft) | ft²							5,804
Multifamily | 2019 Acquisitions
Real Estate [Line Items]
Number of units | unit							2,390
Contract Purchase Price							$ 530,920
Multifamily | 2019 Acquisitions | Assembly Portfolio - Virginia
Real Estate [Line Items]
Number of units | unit				1,685
Contract Purchase Price				$ 379,100
Multifamily | 2019 Acquisitions | Assembly Portfolio - Maryland
Real Estate [Line Items]
Number of units | unit			428
Contract Purchase Price			$ 82,070
Multifamily | 2019 Acquisitions | Cascade at Landmark
Real Estate [Line Items]
Number of units | unit		277
Contract Purchase Price		$ 69,750
Office
Real Estate [Line Items]
Rentable Square Feet (sq ft) | ft²							3,227
Office | 2018 Acquisitions | Arlington Tower
Real Estate [Line Items]
Rentable Square Feet (sq ft) | ft²							391
Contract Purchase Price					$ 250,000
Office | 2017 Acquisitions | Watergate 600
Real Estate [Line Items]
Rentable Square Feet (sq ft) | ft²							293
Contract Purchase Price						$ 135,000
[1]	As of December 31, 2019 , WashREIT had under development multifamily properties, The Trove and Riverside Apartments land parcel. The value not yet placed into service at December 31, 2019 was $96.7 million and $25.6 million , respectively.

Real Estate - Revenue and Incom

Real Estate - Revenue and Income (Loss) for Acquired Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
2019 Acquisitions
Real Estate [Line Items]
Real estate rental revenue	$ 27,641
Net (loss) income	$ (10,167)
2018 Acquisitions
Real Estate [Line Items]
Real estate rental revenue		$ 22,389
Net (loss) income		$ 3,623
2017 Acquisitions
Real Estate [Line Items]
Real estate rental revenue			$ 14,518
Net (loss) income			$ 2,226

Real Estate - Cost Allocation o

Real Estate - Cost Allocation of Asset Acquisitions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
2019 Acquisitions
Real Estate [Line Items]
Net lease intangible liabilities	$ 0
Deferred tax liability	0
Total	531,528
2019 Acquisitions | Tenant origination costs
Real Estate [Line Items]
Intangible assets	0
2019 Acquisitions | Leasing commissions absorption costs
Real Estate [Line Items]
Intangible assets	15,474
2019 Acquisitions | Net lease intangible assets
Real Estate [Line Items]
Intangible assets	0
2019 Acquisitions | Land
Real Estate [Line Items]
Property, plant and equipment	92,391
2019 Acquisitions | Building and improvements
Real Estate [Line Items]
Property, plant and equipment	$ 423,663
2018 Acquisitions
Real Estate [Line Items]
Net lease intangible liabilities		$ (545)
Deferred tax liability		0
Total		250,557
2018 Acquisitions | Tenant origination costs
Real Estate [Line Items]
Intangible assets		13,625
2018 Acquisitions | Leasing commissions absorption costs
Real Estate [Line Items]
Intangible assets		27,465
2018 Acquisitions | Net lease intangible assets
Real Estate [Line Items]
Intangible assets		3,142
2018 Acquisitions | Land
Real Estate [Line Items]
Property, plant and equipment		63,970
2018 Acquisitions | Building and improvements
Real Estate [Line Items]
Property, plant and equipment		$ 142,900
2017 Acquisitions
Real Estate [Line Items]
Net lease intangible liabilities			$ (9,585)
Deferred tax liability			(560)
Total			137,820
2017 Acquisitions | Tenant origination costs
Real Estate [Line Items]
Intangible assets			12,084
2017 Acquisitions | Leasing commissions absorption costs
Real Estate [Line Items]
Intangible assets			23,161
2017 Acquisitions | Net lease intangible assets
Real Estate [Line Items]
Intangible assets			498
2017 Acquisitions | Land
Real Estate [Line Items]
Property, plant and equipment			45,981
2017 Acquisitions | Building and improvements
Real Estate [Line Items]
Property, plant and equipment			$ 66,241

Real Estate - Portfolio and Acq

Real Estate - Portfolio and Acquisitions Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Line Items]
Investment in development of property	$ 124,193		$ 124,193	$ 87,231
Total cost of acquisition			531,500
Contract purchase price				250,000	$ 135,000
Real estate acquisitions, net			528,589	106,400	138,371
Credits received at settlement			2,900
Mortgage note assumed and repaid at settlement			12,724	170,081	52,571
Acquisition deposit			0	0	6,250
Credit settlement adjustment				2,400	1,000
Capitalized asset acquisition-related costs				600	$ 2,800
Issuance of OP Units as consideration in asset acquisition (shares)					12,124
Operating partnership units issued with acquisition			0	0	$ 376
Duration for average share price valuation (days)					20 days
The Trove
Real Estate [Line Items]
Investment in development of property	110,400		110,400
Assets placed into service		$ 12,300
Riverside Apartments land parcel
Real Estate [Line Items]
Investment in development of property	$ 25,600		$ 25,600
Arlington Tower
Real Estate [Line Items]
Mortgage note assumed and repaid at settlement				$ 135,500
Absorption costs
Real Estate [Line Items]
Weighted remaining average life (in months)	2 months

Real Estate - Net Balances of C

Real Estate - Net Balances of Components of Fair Value of In-Place Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Tenant origination costs
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 50,155	$ 57,897
Accumulated Amortization	33,364	36,570
Net	16,791	21,327
Leasing commissions absorption costs
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	122,348	114,354
Accumulated Amortization	92,401	77,194
Net	29,947	37,160
Net lease intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	15,183	16,353
Accumulated Amortization	11,964	11,947
Net	3,219	4,406
Net lease intangible liabilities
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	29,836	31,124
Accumulated Amortization	20,854	20,016
Net	8,982	11,108
Below-market ground lease intangible asset
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	12,080	12,080
Accumulated Amortization	2,282	2,093
Net	$ 9,798	$ 9,987

Real Estate - Amortization of C

Real Estate - Amortization of Combined Components (Details) - Acquired-in-place leases - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Depreciation and amortization expense	$ 27,123	$ 22,361	$ 13,996
Real estate rental revenue increase, net	(924)	(1,225)	(776)
Depreciation and amortization expense, net of revenue effect	$ 26,199	$ 21,136	$ 13,220

Real Estate - Amortization of_2

Real Estate - Amortization of Combined Components Over Next Five Years (Details) - Acquired-in-place leases $ in Thousands	Dec. 31, 2019USD ($)
Depreciation and amortization expense
2020	$ 9,975
2021	8,576
2022	8,078
2023	6,032
2024	5,264
Thereafter	18,611
Real estate rental revenue, net increase
2020	(406)
2021	(547)
2022	(736)
2023	(974)
2024	(862)
Thereafter	(2,238)
Total
2020	9,569
2021	8,029
2022	7,342
2023	5,058
2024	4,402
Thereafter	$ 16,373

Real Estate - Properties Sold a

Real Estate - Properties Sold and Held for Sale (Details) ft² in Thousands, $ in Thousands

Dec. 19, 2019USD ($)ft²

Aug. 27, 2019USD ($)ft²

Aug. 21, 2019USD ($)ft²

Jul. 23, 2019USD ($)ft²

Jun. 26, 2019USD ($)ft²

Jun. 28, 2018USD ($)ft²

Jan. 19, 2018USD ($)ft²

Oct. 23, 2017USD ($)apartment

Dec. 31, 2019USD ($)ft²

Sep. 30, 2019USD ($)

Jun. 30, 2019USD ($)

Jun. 30, 2018USD ($)

Dec. 31, 2019USD ($)ft²

Dec. 31, 2018USD ($)ft²

Dec. 31, 2017USD ($)apartment

Apr. 22, 2019USD ($)

Mar. 31, 2019ft²

Mar. 31, 2018USD ($)ft²

Properties Sold [Line Items]

(Loss) gain on sale

$ 61,000

$ (1,000)

$ 2,500

$ 59,961

$ 2,495

$ 24,915

(Loss) gain on sale

$ 339,000

$ 339,024

$ 0

0

2019 Properties

Properties Sold [Line Items]

Rentable square feet (sq ft) | ft²

2,407

2,407

Contract sales price

$ 792,100

$ 792,100

(Loss) gain on sale

398,985

2019 Properties | Disposal group, not discontinued operations

Properties Sold [Line Items]

(Loss) gain on sale

$ 398,985

2019 Properties | Disposal group, not discontinued operations | Quantico Corporate Center | Office

Properties Sold [Line Items]

Rentable square feet (sq ft) | ft²

272

272

Contract sales price

$ 33,000

$ 33,000

(Loss) gain on sale

$ (1,046)

2019 Properties | Disposal group, not discontinued operations | Shopping Center Portfolio

Properties Sold [Line Items]

(Loss) gain on sale

$ 333,000

2019 Properties | Disposal group, not discontinued operations | Frederick Crossing and Frederick County Square

Properties Sold [Line Items]

(Loss) gain on sale

$ 9,500

2019 Properties | Disposal group, not discontinued operations | Centre at Hagerstown

Properties Sold [Line Items]

(Loss) gain on sale

$ 3,500

2019 Properties | Disposal group, not discontinued operations | 1776 G Street | Office

Properties Sold [Line Items]

Rentable square feet (sq ft) | ft²

262

Contract sales price

$ 129,500

(Loss) gain on sale

$ 61,007

2019 Properties | Held for sale | John Marshall II | Office

Properties Sold [Line Items]

Rentable square feet (sq ft) | ft²

223

223

Contract sales price

$ 63,350

$ 63,350

2019 Properties | Discontinued operations | Shopping Center Portfolio | Retail

Properties Sold [Line Items]

Rentable square feet (sq ft) | ft²

800

Contract sales price

$ 485,250

(Loss) gain on sale

$ 333,023

2019 Properties | Discontinued operations | Frederick Crossing and Frederick County Square | Retail

Properties Sold [Line Items]

Rentable square feet (sq ft) | ft²

520

Contract sales price

$ 57,500

(Loss) gain on sale

$ 9,507

2019 Properties | Discontinued operations | Centre at Hagerstown | Retail

Properties Sold [Line Items]

Rentable square feet (sq ft) | ft²

330

Contract sales price

$ 23,500

(Loss) gain on sale

$ (3,506)

2018 Properties

Properties Sold [Line Items]

Rentable square feet (sq ft) | ft²

648

Contract sales price

$ 194,600

(Loss) gain on sale

2,495

2018 Properties | Disposal group, not discontinued operations

Properties Sold [Line Items]

(Loss) gain on sale

$ 2,495

2018 Properties | Disposal group, not discontinued operations | Braddock Metro Center | Office

Properties Sold [Line Items]

Rentable square feet (sq ft) | ft²

356

Contract sales price

$ 93,000

(Loss) gain on sale

$ 0

2018 Properties | Disposal group, not discontinued operations | 2445 M Street | Office

Properties Sold [Line Items]

Rentable square feet (sq ft) | ft²

292

292

Contract sales price

$ 101,600

$ 101,600

$ 100,000

(Loss) gain on sale

$ 2,495

2017 Properties

Properties Sold [Line Items]

Contract sales price

32,200

(Loss) gain on sale

23,838

2017 Properties | Disposal group, not discontinued operations

Properties Sold [Line Items]

(Loss) gain on sale

$ 23,838

2017 Properties | Disposal group, not discontinued operations | Walker House Apartments | Multifamily

Properties Sold [Line Items]

Number of units | apartment

212

212

Contract sales price

$ 32,200

$ 32,200

(Loss) gain on sale

$ 23,838

$ 23,800

Real Estate - Properties Sold_2

Real Estate - Properties Sold and Held for Sale Narrative (Details) ft² in Thousands, $ in Thousands	Dec. 19, 2019USD ($)ft²	Aug. 27, 2019USD ($)	Aug. 21, 2019USD ($)	Jul. 23, 2019USD ($)	Jun. 26, 2019USD ($)ft²	Jun. 28, 2018USD ($)ft²	Jan. 19, 2018USD ($)ft²	Oct. 23, 2017USD ($)apartment	Jun. 30, 2019agreementbuyer	Dec. 31, 2019USD ($)ft²	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)ft²buildings	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)ft²	Dec. 31, 2019USD ($)ft²	Dec. 31, 2018USD ($)ft²	Dec. 31, 2017USD ($)apartment	Apr. 22, 2019USD ($)
Real Estate [Line Items]
(Loss) gain on sale										$ 61,000		$ (1,000)		$ 2,500		$ 59,961	$ 2,495	$ 24,915
Impairment of real estate													$ 8,400		$ 1,900	8,374	1,886	33,152
(Loss) gain on sale											$ 339,000					339,024	0	0
Loss on extinguishment of debt																$ 764	$ 0	0
2019 Properties
Real Estate [Line Items]
Area of property (sq ft) | ft²										2,407						2,407
Contract sales price										$ 792,100						$ 792,100
2019 Properties | Disposal group, not discontinued operations
Real Estate [Line Items]
Loss on extinguishment of debt											$ 800
2018 Properties
Real Estate [Line Items]
Area of property (sq ft) | ft²																	648
Contract sales price																	$ 194,600
(Loss) gain on sale																	2,495
2018 Properties | Disposal group, not discontinued operations
Real Estate [Line Items]
(Loss) gain on sale																	$ 2,495
2017 Properties
Real Estate [Line Items]
Contract sales price																		32,200
(Loss) gain on sale																		23,838
2017 Properties | Disposal group, not discontinued operations
Real Estate [Line Items]
(Loss) gain on sale																		23,838
Quantico Corporate Center | Office | 2019 Properties | Disposal group, not discontinued operations
Real Estate [Line Items]
Number of buildings | buildings													2
Area of property (sq ft) | ft²					272								272
Contract sales price					$ 33,000														$ 33,000
(Loss) gain on sale					$ (1,046)
Impairment of real estate													$ 8,400
Shopping Center Portfolio and Power Center Portfolio
Real Estate [Line Items]
Number of purchase and sale agreements | agreement									2
Number of buyers | buyer									2
Shopping Center Portfolio | 2019 Properties | Disposal group, not discontinued operations
Real Estate [Line Items]
(Loss) gain on sale				$ 333,000
Frederick Crossing and Frederick County Square | 2019 Properties | Disposal group, not discontinued operations
Real Estate [Line Items]
(Loss) gain on sale			$ 9,500
Centre at Hagerstown | 2019 Properties | Disposal group, not discontinued operations
Real Estate [Line Items]
(Loss) gain on sale		$ 3,500
1776 G Street | Office | 2019 Properties | Disposal group, not discontinued operations
Real Estate [Line Items]
Area of property (sq ft) | ft²	262
Contract sales price	$ 129,500
(Loss) gain on sale	$ 61,007
John Marshall II | Office | 2019 Properties | Held for sale
Real Estate [Line Items]
Area of property (sq ft) | ft²										223						223
Contract sales price										$ 63,350						$ 63,350
Braddock Metro Center | Office | 2018 Properties | Disposal group, not discontinued operations
Real Estate [Line Items]
Area of property (sq ft) | ft²							356
Contract sales price							$ 93,000
(Loss) gain on sale							$ 0
Impairment of real estate																		9,100
2445 M Street | Office | 2018 Properties | Disposal group, not discontinued operations
Real Estate [Line Items]
Area of property (sq ft) | ft²						292									292
Contract sales price						$ 101,600								$ 101,600	$ 100,000
(Loss) gain on sale						$ 2,495
Impairment of real estate															$ 1,900			24,100
Walker House Apartments | Multifamily | 2017 Properties | Disposal group, not discontinued operations
Real Estate [Line Items]
Contract sales price								$ 32,200										32,200
(Loss) gain on sale								$ 23,838										$ 23,800
Number of units | apartment								212										212

Real Estate - Discontinued Oper

Real Estate - Discontinued Operations Results of Retail Portfolio (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Results of Discontinued Operations
Loss on extinguishment of debt		$ (764)	$ 0	$ 0
Gain on sale of real estate	$ 339,000	339,024	0	0
Income from discontinued operations		$ 354,418	$ 24,477	$ 23,180
Discontinued operations, basic (in dollars per share)		$ 4.39	$ 0.31	$ 0.30
Discontinued operations, diluted (in dollars per share)		$ 4.39	$ 0.31	$ 0.30
Retail Portfolio | Discontinued operations
Results of Discontinued Operations
Real estate rental revenue		$ 28,200	$ 45,160	$ 44,797
Real estate expenses		(6,803)	(10,638)	(10,251)
Depreciation and amortization		(4,926)	(9,402)	(10,626)
Interest expense		(313)	(643)	(740)
Loss on extinguishment of debt		(764)	0	0
Gain on sale of real estate		339,024	0	0
Income from discontinued operations		354,418	24,477	23,180
Capital expenditures		$ 809	$ 2,138	$ 1,601

Real Estate - Discontinued Op_2

Real Estate - Discontinued Operations Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets - Discontinued Operations
Land	$ 566,807	$ 526,572
Income producing property	2,392,415	2,055,349
Income producing property, at cost	2,959,222	2,581,921
Accumulated depreciation and amortization	(693,610)	(669,281)
Net income producing property	2,265,612	1,912,640
Rents and other receivables	65,259	63,962
Prepaid expenses and other assets	95,149	123,670
Liabilities - Discontinued Operations
Mortgage notes payable, net	47,074	48,277
Accounts payable and other liabilities	71,136	57,946
Advance rents	9,353	9,965
Tenant security deposits	$ 10,595	9,501
Retail Portfolio | Discontinued operations
Assets - Discontinued Operations
Land		88,087
Income producing property		216,577
Income producing property, at cost		304,664
Accumulated depreciation and amortization		(101,254)
Net income producing property		203,410
Rents and other receivables		9,898
Prepaid expenses and other assets		8,653
Total assets		221,961
Liabilities - Discontinued Operations
Mortgage notes payable, net		11,515
Accounts payable and other liabilities		1,620
Advance rents		1,771
Tenant security deposits		612
Liabilities related to properties sold or held for sale		$ 15,518

Lease Accounting - Schedule of

Lease Accounting - Schedule of Future Minimum Rental Income (Details) $ in Thousands	Dec. 31, 2019USD ($)
Future Minimum rental income
2020	$ 139,053
2021	133,907
2022	120,491
2023	102,877
2024	91,253
Thereafter	301,974
Total	$ 889,555

Lease Accounting - Leasing as a

Lease Accounting - Leasing as a Lessor Narrative (Details)	Dec. 31, 2019
Multifamily Properties
Lessor, Lease, Description [Line Items]
Lessor operating lease terms (in years)	1 year

Lease Accounting - Leasing as_2

Lease Accounting - Leasing as a Lessee Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating ground lease remaining lease term (in years)	51 years
Straight-line rental expense	$ 300	$ 300	$ 300
Variable rental payments	900	900	$ 900
Lease liability	$ 3,970
Operating lease discount rate (percent)	5.90%
Right-of-use asset and lease liability amortization	$ 300
ASU 2016-02
Lessee, Lease, Description [Line Items]
Right-of-use asset				$ 4,200
Lease liability				4,200
Below-market ground lease
Lessee, Lease, Description [Line Items]
Accumulated amortizatiom on below-market ground lease intangible assets prior to reclassification		$ 2,100
Below-market ground lease | Reclassification adjustment | ASU 2016-02
Lessee, Lease, Description [Line Items]
Below-market ground lease intangible asset reclassified				$ 10,000

Lease Accounting - Schedule o_2

Lease Accounting - Schedule of Obligations for Future Minimum Payments on Operating Ground Lease (Details) $ in Thousands	Dec. 31, 2019USD ($)
Obligations for Future Minimum Payments on Operating Ground Lease
2020	$ 260
2021	260
2022	260
2023	260
2024	260
Thereafter	11,895
Total minimum payments due	13,195
Imputed interest	(9,225)
Lease liability	$ 3,970

Mortgage Note Payable - Outstan

Mortgage Note Payable - Outstanding Mortgage Notes Payable (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
		Jan. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Gain on extinguishment of debt			$ 0	$ (1,178)	$ 0
Income producing property, at cost			2,959,222	2,581,921
Yale West
Debt Instrument [Line Items]
Income producing property, at cost			77,400	76,900
Mortgages notes payable
Debt Instrument [Line Items]
Premiums and discounts, net			1,470	2,187
Deferred issuance costs, net			(50)	(65)
Total, net			$ 47,074	48,277
Mortgages notes payable | Yale West
Debt Instrument [Line Items]
Effective interest rate (percent)	[1]		3.75%
Total principal			$ 45,654	$ 46,155
Mortgages notes payable | Yale West | Subsequent Event
Debt Instrument [Line Items]
Gain on extinguishment of debt		$ 500
[1]	Yield on the assumption/issuance date, including the effects of any premiums, discounts or fair value adjustments on the notes.

Unsecured Lines of Credit Pay_3

Unsecured Lines of Credit Payable - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)extension_option	Dec. 31, 2019USD ($)arrangement	Dec. 31, 2018USD ($)	Mar. 29, 2018USD ($)arrangement	Dec. 31, 2017USD ($)	Jul. 22, 2016USD ($)arrangement	Sep. 15, 2015USD ($)arrangement
Line of Credit Facility [Line Items]
Revolving credit facility borrowing capacity		$ 700,000,000	$ 700,000,000		$ 600,000,000
One-month LIBOR (percent)		1.70%
U.S. Covered Terrorism Losses, Percent		0.85
Insurance provider covered terrorism loss (percent)		0.10
Aggregate insured losses from all insurers in covered terrorism metric		$ 100,000,000,000
Interest Rate Swap
Line of Credit Facility [Line Items]
Derivative notional amount		$ 600,000,000
Credit Agreement 2018
Line of Credit Facility [Line Items]
Credit agreement, aggregate maximum borrowing capacity including accordion feature	$ 1,500,000,000
2015 Term Loan | Interest Rate Swap
Line of Credit Facility [Line Items]
Number of interest rate swaps | arrangement		2					2
Derivative notional amount		$ 150,000,000					$ 150,000,000
Derivative fixed interest rate (percent)							2.72%
2016 Term Loan | Interest Rate Swap
Line of Credit Facility [Line Items]
Number of interest rate swaps | arrangement						2
Derivative notional amount						$ 150,000,000
Derivative fixed interest rate (percent)						2.86%
2018 Term Loan
Line of Credit Facility [Line Items]
Debt instrument face amount				$ 250,000,000
2018 Term Loan | Interest Rate Swap
Line of Credit Facility [Line Items]
Derivative fixed interest rate (percent)				2.87%
2018 Term Loan A | Interest Rate Swap
Line of Credit Facility [Line Items]
Derivative notional amount	$ 150,000,000	150,000,000		$ 150,000,000
Derivative fixed interest rate (percent)	2.31%			2.31%
2018 Term Loan B
Line of Credit Facility [Line Items]
Debt instrument face amount				$ 100,000,000
2018 Term Loan B | Interest Rate Swap
Line of Credit Facility [Line Items]
Number of interest rate swaps | arrangement				4
Derivative notional amount	$ 100,000,000	$ 100,000,000		$ 100,000,000
Derivative fixed interest rate (percent)	3.71%			3.71%
Term Loan | 2015 Term Loan
Line of Credit Facility [Line Items]
Debt instrument face amount	$ 150,000,000
Debt instrument term (in years)		5 years 6 months
Effective interest rate (percent)		2.70%
Term Loan | 2015 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		1.10%
Term Loan | 2016 Term Loan
Line of Credit Facility [Line Items]
Debt instrument face amount					150,000,000
Term Loan | 2018 Term Loan
Line of Credit Facility [Line Items]
Debt instrument face amount	250,000,000
Effective interest rate (percent)		2.87%
Proceeds from issuance of debt	100,000,000
Term Loan | 2018 Term Loan | LIBOR | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		0.85%
Term Loan | 2018 Term Loan | LIBOR | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		1.75%
Term Loan | 2018 Term Loan | Base Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		0.00%
Term Loan | 2018 Term Loan | Base Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		0.75%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility borrowing capacity	$ 700,000,000	$ 700,000,000			$ 600,000,000
Debt instrument term (in years)	4 years
Number of extensions allowed | extension_option	2
Term of allowable extension (in years)	6 months
Commitment fee (percent)		0.20%
Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Commitment fee (percent)		0.10%
Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Commitment fee (percent)		0.30%
Revolving Credit Facility | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		1.00%
Base rate component, spread on variable rate (percent)		1.00%
Revolving Credit Facility | LIBOR | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		0.775%
Revolving Credit Facility | LIBOR | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		1.55%
Revolving Credit Facility | Base Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		0.00%
Revolving Credit Facility | Base Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)		0.55%
Revolving Credit Facility | Federal Funds Rate
Line of Credit Facility [Line Items]
Base rate component, spread on variable rate (percent)		0.50%

Unsecured Lines of Credit Pay_4

Unsecured Lines of Credit Payable - Revolving Credit Facility Unused and Available Credit (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Committed capacity	$ 700,000,000	$ 700,000,000		$ 600,000,000
Borrowings outstanding	(56,000,000)	(188,000,000)		(166,000,000)
Revolving Credit Facility
Line of Credit Facility [Line Items]
Committed capacity	700,000,000		$ 700,000,000	$ 600,000,000
Borrowings outstanding	(56,000,000)	$ (188,000,000)
Unused and available	$ 644,000,000

Unsecured Lines of Credit Pay_5

Unsecured Lines of Credit Payable - Revolving Credit Facility Borrowings and Repayments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Line of Credit [Roll Forward]
Balance at December 31, 2018	$ 188,000
Balance at December 31, 2019	56,000
Revolving Credit Facility
Line of Credit [Roll Forward]
Balance at December 31, 2018	188,000
Borrowings	687,000
Repayments	(819,000)
Balance at December 31, 2019	$ 56,000

Unsecured Lines of Credit Pay_6

Unsecured Lines of Credit Payable - Recognized Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Interest expense (excluding facility fees)	$ 6,554	$ 6,843	$ 3,857
Facility fees	$ 1,400	$ 1,371	$ 1,217

Unsecured Lines of Credit Pay_7

Unsecured Lines of Credit Payable - Information Related to Revolving Credit Facility (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Total revolving credit facilities	$ 700,000	$ 700,000	$ 600,000
Borrowings outstanding	56,000	188,000	166,000
Weighted average daily borrowings during the year	196,074	230,934	179,633
Maximum daily borrowings during the year	$ 300,000	$ 429,000	$ 252,000
Weighted average interest rate during the year	3.34%	2.96%	2.15%
Weighted average interest rate on borrowings outstanding	2.73%	3.52%	2.54%

Notes Payable - Unsecured Notes

Notes Payable - Unsecured Notes and Term Loans Outstanding (Details) - USD ($)		12 Months Ended
		Dec. 31, 2019	Nov. 30, 2019	Dec. 31, 2018
Unsecured Debt
Debt Instrument [Line Items]
Total principal		$ 1,000,000,000		$ 1,000,000,000
Premiums and discounts, net		(797,000)		(1,189,000)
Deferred issuance costs, net		(2,481,000)		(3,414,000)
Total, net		996,722,000		995,397,000
Principal amounts due		$ 0
10 Year Unsecured Notes 4.95%
Debt Instrument [Line Items]
Coupon/Stated rate (percent)			4.95%
10 Year Unsecured Notes 4.95% | Unsecured Debt
Debt Instrument [Line Items]
Coupon/Stated rate (percent)		4.95%
Effective interest rate (percent)	[1]	5.05%
Total principal		$ 250,000,000		250,000,000
Payoff Date/Maturity Date	[2]	Oct. 1, 2020
2015 Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Effective interest rate (percent)	[1]	2.72%
Total principal		$ 150,000,000		150,000,000
Payoff Date/Maturity Date	[2]	Mar. 15, 2021
2015 Term Loan | Unsecured Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		1.10%
10 Year Unsecured Notes 3.95% | Unsecured Debt
Debt Instrument [Line Items]
Coupon/Stated rate (percent)		3.95%
Effective interest rate (percent)	[1]	4.02%
Total principal		$ 300,000,000		300,000,000
Payoff Date/Maturity Date	[2]	Oct. 15, 2022
2018 Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Effective interest rate (percent)	[1],[3]	2.87%
Total principal	[3]	$ 250,000,000		250,000,000
Payoff Date/Maturity Date	[2]	Jul. 21, 2023
2018 Term Loan | Unsecured Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		1.10%
30 Year Unsecured Notes 7.25% | Unsecured Debt
Debt Instrument [Line Items]
Coupon/Stated rate (percent)		7.25%
Effective interest rate (percent)	[1]	7.36%
Total principal		$ 50,000,000		$ 50,000,000
Payoff Date/Maturity Date	[2]	Feb. 25, 2028
[1]	For fixed rate notes, the effective rate represents the yield on issuance date, including the effects of discounts on the notes. For variable rate notes, the effective rate represents the rate as fixed by interest rate derivatives (see note 8 ).
[2]	No
[3]	The 2018 Term Loan increased and replaced the 2016 Term Loan (see note 6).

Notes Payable - Narrative (Deta

Notes Payable - Narrative (Details) - Term Loan - 2019 Term Loan - USD ($)	Apr. 30, 2019	Sep. 30, 2019	Sep. 30, 2019
Short-term Debt [Line Items]
Debt instrument term (in years)	6 months
Debt instrument face amount	$ 450,000,000
Debt instrument maturity date	Oct. 30, 2019
Repayment of borrowings		$ 450,000,000
LIBOR
Short-term Debt [Line Items]
Base rate component, spread on variable rate (percent)			1.00%
Basis point component of interest rate at Company's election (percent)			1.00%
LIBOR | Minimum
Short-term Debt [Line Items]
Basis spread on variable rate (percent)			0.75%
LIBOR | Maximum
Short-term Debt [Line Items]
Basis spread on variable rate (percent)			1.65%
Base Rate | Minimum
Short-term Debt [Line Items]
Basis spread on variable rate (percent)			0.00%
Base Rate | Maximum
Short-term Debt [Line Items]
Basis spread on variable rate (percent)			0.65%
Federal Funds Rate
Short-term Debt [Line Items]
Base rate component, spread on variable rate (percent)			0.50%

Notes Payable - Required Princi

Notes Payable - Required Principal Payments on Unsecured Notes and Term Loans (Details) - Unsecured Debt - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Required Principal Payments [Abstract]
2020	$ 250,000
2021	150,000
2022	300,000
2023	250,000
2024	0
Thereafter	50,000
Total principal	$ 1,000,000	$ 1,000,000

Derivative Instruments - Narrat

Derivative Instruments - Narrative (Details)	1 Months Ended	12 Months Ended
	Nov. 30, 2019USD ($)arrangement	Dec. 31, 2019USD ($)arrangement	Mar. 31, 2018USD ($)	Mar. 29, 2018USD ($)arrangement	Jul. 22, 2016USD ($)arrangement	Sep. 15, 2015USD ($)arrangement
Derivative [Line Items]
Estimated amount to be reclassified within next twelve months as an increase to interest expense		$ 100,000
Interest Rate Swap
Derivative [Line Items]
Derivative notional amount		600,000,000
Fair value of derivative assets		5,500,000
Fair value of derivative liabilities		$ 3,700,000
2015 Term Loan | Interest Rate Swap
Derivative [Line Items]
Number of derivative arrangements | arrangement		2				2
Derivative notional amount		$ 150,000,000				$ 150,000,000
All-in fixed interest rate (percent)						2.72%
2016 Term Loan | Interest Rate Swap
Derivative [Line Items]
Number of derivative arrangements | arrangement					2
Derivative notional amount					$ 150,000,000
All-in fixed interest rate (percent)					2.86%
2018 Term Loan
Derivative [Line Items]
Debt instrument face amount				$ 250,000,000
2018 Term Loan | Interest Rate Swap
Derivative [Line Items]
All-in fixed interest rate (percent)				2.87%
2018 Term Loan A | Interest Rate Swap
Derivative [Line Items]
Derivative notional amount		150,000,000	$ 150,000,000	$ 150,000,000
All-in fixed interest rate (percent)			2.31%	2.31%
2018 Term Loan B
Derivative [Line Items]
Debt instrument face amount				$ 100,000,000
2018 Term Loan B | Interest Rate Swap
Derivative [Line Items]
Number of derivative arrangements | arrangement				4
Derivative notional amount		100,000,000	$ 100,000,000	$ 100,000,000
All-in fixed interest rate (percent)			3.71%	3.71%
Replacement 10-year 4.95% notes | Interest Rate Swap
Derivative [Line Items]
Number of derivative arrangements | arrangement	4
Derivative notional amount	$ 200,000,000	$ 200,000,000
10 Year Unsecured Notes 4.95%
Derivative [Line Items]
Debt instrument face amount	$ 250,000,000
Stated interest rate (percent)	4.95%
Debt instrument term (in years)	10 years

Derivative Instruments - Fair V

Derivative Instruments - Fair Value of Interest Rate Swaps (Details) - Interest Rate Swap - USD ($)	Dec. 31, 2019	Nov. 30, 2019	Dec. 31, 2018	Mar. 31, 2018	Mar. 29, 2018	Sep. 15, 2015
Derivative [Line Items]
Aggregate Notional Amount	$ 600,000,000
Derivative Assets (Liabilities)	1,823,000		$ 9,839,000
2015 Term Loan
Derivative [Line Items]
Aggregate Notional Amount	150,000,000					$ 150,000,000
2015 Term Loan | Accounts payable and other liabilities
Derivative [Line Items]
Derivative Assets (Liabilities)	(62,000)
2015 Term Loan | Prepaid expenses and other assets
Derivative [Line Items]
Derivative Assets (Liabilities)			2,720,000
2018 Term Loan A
Derivative [Line Items]
Aggregate Notional Amount	150,000,000			$ 150,000,000	$ 150,000,000
2018 Term Loan A | Prepaid expenses and other assets
Derivative [Line Items]
Derivative Assets (Liabilities)	1,825,000		7,918,000
2018 Term Loan B
Derivative [Line Items]
Aggregate Notional Amount	100,000,000			$ 100,000,000	$ 100,000,000
2018 Term Loan B | Accounts payable and other liabilities
Derivative [Line Items]
Derivative Assets (Liabilities)	(3,664,000)		(799,000)
Replacement 10-year 4.95% notes
Derivative [Line Items]
Aggregate Notional Amount	200,000,000	$ 200,000,000
Replacement 10-year 4.95% notes | Prepaid expenses and other assets
Derivative [Line Items]
Derivative Assets (Liabilities)	$ 3,724,000		$ 0

Derivative Instruments - Net Ga

Derivative Instruments - Net Gains and Losses on Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (loss) gain on interest rate hedges	$ (8,016)	$ 420	$ 1,808
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (loss) gain on interest rate hedges	$ (8,016)	$ 420	$ 1,808

Fair Value Disclosures - Assets

Fair Value Disclosures - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Interest Rate Swap
Assets:
Interest rate swaps	$ 5,500
Liabilities:
Interest rate swaps	(3,700)
Recurring | SERP
Assets:
SERP	1,792	$ 1,364
Recurring | Interest Rate Swap
Assets:
Interest rate swaps	5,549	10,638
Liabilities:
Interest rate swaps	(3,726)	(799)
Recurring | Level 1 | SERP
Assets:
SERP	0	0
Recurring | Level 1 | Interest Rate Swap
Assets:
Interest rate swaps	0	0
Liabilities:
Interest rate swaps	0	0
Recurring | Level 2 | SERP
Assets:
SERP	1,792	1,364
Recurring | Level 2 | Interest Rate Swap
Assets:
Interest rate swaps	5,549	10,638
Liabilities:
Interest rate swaps	(3,726)	(799)
Recurring | Level 3 | SERP
Assets:
SERP	0	0
Recurring | Level 3 | Interest Rate Swap
Assets:
Interest rate swaps	0	0
Liabilities:
Interest rate swaps	$ 0	$ 0

Fair Value Disclosures - Carryi

Fair Value Disclosures - Carrying Values and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable	$ 47,074	$ 48,277
Line of credit payable	56,000	188,000
Notes payable	996,722	995,397
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	12,939	6,016
Restricted cash	1,812	1,624
Mortgage notes payable	47,899	48,368
Line of credit payable	56,000	188,000
Notes payable	$ 1,022,937	1,015,210
Olney Village Center | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable		11,500
Olney Village Center | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage notes payable		$ 12,000

Stock Based Compensation - Narr

Stock Based Compensation - Narrative (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Washington Real Estate Investment Trust 2016 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	2,400,000
Plan in effect, period (in years)	10 years
Options outstanding (in shares)	0	0
Washington Real Estate Investment Trust 2007 Omnibus Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	2,000,000

Stock Based Compensation - Shor

Stock Based Compensation - Short-Term Incentive Plan and Long-Term Incentive Plan Narrative (Details)	12 Months Ended
	Dec. 31, 2019employment_yearshares	Dec. 31, 2018shares	Dec. 31, 2017shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighting for performance measurement on FTSE NAREIT Diversified Index	50.00%
Restricted Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognition period for compensation costs not yet recognized	22 months
One-time equity award granted (shares) | shares	213,782	304,087	330,639
Retirement age with 20 years employment | employment_year	55
Years of employment for retirement age metric	20 years
Retirement age | employment_year	65
Restricted Share Awards | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
One-time equity award granted (shares) | shares			100,000
Percentage of equity award that vests on fifth anniversary of grant date			100.00%
STIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	1 year
Percentage of potential award based upon service requirement	50.00%
Percentage of STIP award with grant date of Compensation Committee approval date	50.00%
STIP | Performance-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage payable In unrestricted shares	75.00%
Percentage payable in restricted shares	25.00%
Performance period	3 years		3 years
Award vesting period	3 years
Performance evaluated on absolute total shareholder return	50.00%		50.00%
Performance evaluated on relative total shareholder return	50.00%		50.00%
Weighting for performance measurement based on select peer companies	0.50
Weighting for performance measurement on FTSE NAREIT Diversified Index	50.00%
LTIP | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance evaluated on absolute total shareholder return	39.00%	35.00%	13.00%
Performance evaluated on relative total shareholder return	35.00%	31.00%	37.00%
Grant date fair value as a percentage of base salary	80.00%
LTIP | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance evaluated on absolute total shareholder return	74.00%	68.00%	31.00%
Performance evaluated on relative total shareholder return	68.00%	60.00%	67.00%
Grant date fair value as a percentage of base salary	150.00%
Cash | STIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage payable In unrestricted shares	100.00%
Cash | STIP | Performance-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage payable In unrestricted shares	50.00%
Restricted Share Units | STIP | Performance-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage payable in restricted shares	50.00%
Restricted Share Units | LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	1 year	3 years
Restricted Share Units | LTIP | Performance-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognition period for compensation costs not yet recognized	4 years
Unrestricted Share Awards | LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognition period for compensation costs not yet recognized	3 years

Stock Based Compensation - Assu

Stock Based Compensation - Assumptions for LTIP Awards (Details) - LTIP - $ / shares		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility (percent)	[1]	18.10%	17.90%
Expected volatility, minimum (percent)	[2]		18.50%
Expected volatility, maximum (percent)	[2]		18.70%
Risk-free interest rate (percent)	[1]	2.40%	2.40%	1.50%
Share price at grant date (in dollars per share)		$ 23	$ 26.06
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	[3]	3 years	3 years	3 years
Share price at grant date (in dollars per share)			$ 30.84
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	[3]	4 years	4 years	4 years
Share price at grant date (in dollars per share)			$ 32.69
[1]	Risk-free interest rate based on U.S. treasury constant maturity bonds on the measurement date with a maturity equal to the market condition performance period.
[2]	Expected volatility based upon historical volatility of our daily closing share price.
[3]	Expected term based on the market condition performance period.

Stock Based Compensation - Trus

Stock Based Compensation - Trustee Awards and Total Compensation Expense Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 7,700,000	$ 6,700,000	$ 4,800,000
Capitalized stock-based compensation expense	200,000	300,000	200,000
Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based compensation for each trustee	$ 100,000	$ 100,000	$ 100,000

Stock Based Compensation - Rest

Stock Based Compensation - Restricted Share Awards with Performance and Service Conditions (Details) - Restricted Share Awards - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted share awards, excluding those subject to market conditions
Unvested, beginning (in shares)	311,010	236,694	107,699
Granted (in shares)	213,782	304,087	330,639
Vested during year (in shares)	(236,013)	(224,150)	(194,569)
Forfeited (in shares)	(19,396)	(5,621)	(7,075)
Unvested, ending (in shares)	269,383	311,010	236,694
Weighted Average Grant Date Fair Value
Unvested, beginning (in dollars per share)	$ 29.07	$ 27.96	$ 26.47
Granted (in dollars per share)	26.26	25.98	32.46
Vested during year (in dollars per share)	27.43	27.40	30.50
Forfeited (in dollars per share)	26.60	29.43	27.43
Unvested, ending (in dollars per share)	$ 28.45	$ 29.07	$ 27.96

Stock Based Compensation - Re_2

Stock Based Compensation - Restricted Share Awards with Performance and Service Conditions Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted share units vested	$ 6.5	$ 6.1	$ 5.9
Restricted Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs not yet recognized	$ 5.9
Recognition period for compensation costs not yet recognized	22 months

Stock Based Compensation - Re_3

Stock Based Compensation - Restricted and Unrestricted Shares with Market Conditions (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighting for performance measurement on FTSE NAREIT Diversified Index		50.00%
Relative Peer TSR | Restricted Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value		$ 184	$ 203	$ 222
Unamortized Value		138	85	44
Relative Peer TSR | Unrestricted Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value		552	608	666
Unamortized Value		368	171	0
Absolute/Index TSR | Restricted Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value	[1]	201	230	100
Unamortized Value	[1]	151	96	20
Absolute/Index TSR | Unrestricted Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value	[1]	602	690	299
Unamortized Value	[1]	$ 401	$ 194	$ 0
LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighting for performance measurement based on select peer companies		0.50
Weighting for performance measurement on FTSE NAREIT Diversified Index		50.00%
Performance evaluated on absolute total shareholder return		50.00%		50.00%
Performance evaluated on relative total shareholder return		50.00%		50.00%
[1]	(1) The performance conditions for the 2019 and 2018 awards were evaluated based on 50% on TSR relative to a defined population of peer companies and 50% on TSR relative to the FTSE NAREIT Diversified Index. The performance condition for the 2017 awards was evaluated based 50% on absolute TSR and 50% on relative TSR.

Other Benefit Plans - Narrative

Other Benefit Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
401I(k) plan contributions by employer	$ 0.5	$ 0.5	$ 0.4
Liability, Other Postretirement Defined Benefit Plan, Noncurrent	0.9	1.1
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	0.2	0.3	$ 0.3
Officer
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Accrued benefit liability	$ 1.8	$ 1.4

Earnings Per Common Share - Com

Earnings Per Common Share - Computation of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Income (loss) from continuing operations	$ 54,198		$ (8,432)		$ (6,191)		$ (10,443)		$ (304)		$ (547)		$ 4,563		$ (2,559)		$ 29,132	$ 1,153	$ (3,568)
Net loss attributable to noncontrolling interests																	0	0	56
Allocation of losses (earnings) from continuing operations to unvested restricted share awards																	(125)	(526)	(362)
Adjusted income (loss) from continuing operations attributable to the controlling interests																	29,007	627	(3,874)
Income from discontinued operations, including gain on sale of real estate																	354,418	24,477	23,180
Allocation of earnings from discontinued operations to unvested restricted share awards																	(1,837)	0	0
Adjusted income from discontinued operations																	352,581	24,477	23,180
Adjusted net income attributable to the controlling interests																	$ 381,588	$ 25,104	$ 19,306
Denominator:
Weighted average shares outstanding – basic (in shares)																	80,257	78,960	76,820
Effect of dilutive securities:
Operating partnership units																	12	12	0
Employee restricted share awards																	66	70	0
Weighted average shares outstanding – diluted (in shares)																	80,335	79,042	76,820
Earnings per common share, basic:
Continuing operations, basic (in dollars per share)	$ 0.66	[1]	$ (0.10)	[1]	$ (0.08)	[1]	$ (0.13)	[1]	$ 0	[1]	$ (0.01)	[1]	$ 0.06	[1]	$ (0.03)	[1]	$ 0.36	$ 0.01	$ (0.05)
Discontinued operations, basic (in dollars per share)																	4.39	0.31	0.30
Net income attributable to the controlling interests per share (in dollars per share)	0.66	[1]	4.14	[1]	0.01	[1]	(0.06)	[1]	0.07	[1]	0.07	[1]	0.14	[1]	0.04	[1]	4.75	0.32	0.25
Earnings per common share, diluted:
Continuing operations, diluted (in dollars per share)	0.66	[1]	(0.10)	[1]	(0.08)	[1]	(0.13)	[1]	0	[1]	(0.01)	[1]	0.06	[1]	(0.03)	[1]	0.36	0.01	(0.05)
Discontinued operations, diluted (in dollars per share)																	4.39	0.31	0.30
Net income attributable to the controlling interests per share (in dollars per share)	$ 0.66	[1]	$ 4.14	[1]	$ 0.01	[1]	$ (0.06)	[1]	$ 0.07	[1]	$ 0.07	[1]	$ 0.13	[1]	$ 0.04	[1]	4.75	0.32	0.25
Dividends declared per common share (in dollars per share)																	$ 1.20	$ 1.20	$ 1.20
[1]	With regard to per share calculations, the sum of the quarterly results may not equal full year results due to rounding.

Segment Information - Segments

Segment Information - Segments (Details)	12 Months Ended
	Dec. 31, 2019propertysegment	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Number of retail properties sold | property	8
Reportable segments | Multifamily
Segment Reporting Information [Line Items]
Real estate rental revenue as a percentage of total	0.41	0.33	0.34
Percentage of total income producing real estate assets	0.50	0.36
Reportable segments | Office
Segment Reporting Information [Line Items]
Real estate rental revenue as a percentage of total	0.53	0.61	0.60
Percentage of total income producing real estate assets	0.45	0.58
Corporate and other
Segment Reporting Information [Line Items]
Real estate rental revenue as a percentage of total	0.06	0.06	0.06
Percentage of total income producing real estate assets	0.05	0.06

Segment Information - Financial

Segment Information - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reconciliation [Abstract]
Real estate rental revenue	$ 80,667	$ 80,259	$ 76,820	$ 71,434	$ 71,740	$ 71,001	$ 75,344	$ 73,645	$ 309,180	$ 291,730	$ 280,281
Real estate expenses									115,580	105,592	105,400
Net operating income									193,600	186,138	174,881
Depreciation and amortization									(136,253)	(111,826)	(101,430)
General and administrative									(24,370)	(22,089)	(22,580)
Lease origination expenses									(1,698)	0	0
Interest expense									(53,734)	(50,501)	(46,793)
Real estate impairment				(8,400)				(1,900)	(8,374)	(1,886)	(33,152)
Other income									0	0	507
Gain on sale of real estate	61,000		(1,000)				2,500		59,961	2,495	24,915
Loss on extinguishment of debt									0	(1,178)	0
Income tax benefit									0	0	84
Income from operations of properties sold or held for sale									16,158	24,477	23,180
Gain on sale of real estate		339,000							339,024	0	0
Loss on extinguishment of debt									(764)	0	0
Net income	54,198	332,770	987	(4,405)	5,688	5,893	10,750	3,299	383,550	25,630	19,612
Net loss attributable to noncontrolling interests									0	0	56
Net income attributable to the controlling interests	54,198	$ 332,770	$ 987	$ (4,405)	5,688	$ 5,893	$ 10,750	$ 3,299	383,550	25,630	19,668
Capital expenditures									68,947	72,033	64,381
Total assets	2,628,328				2,417,104				2,628,328	2,417,104	2,359,426
Reportable segments | Office
Segment Reconciliation [Abstract]
Real estate rental revenue									164,059	178,474	167,438
Real estate expenses									60,923	63,321	62,824
Net operating income									103,136	115,153	104,614
Capital expenditures									38,634	42,019	30,407
Total assets	1,134,147				1,248,673				1,134,147	1,248,673	1,203,187
Reportable segments | Multifamily
Segment Reconciliation [Abstract]
Real estate rental revenue									126,131	95,194	95,250
Real estate expenses									49,135	37,235	37,640
Net operating income									76,996	57,959	57,610
Capital expenditures									25,779	25,117	27,980
Total assets	1,340,634				792,170				1,340,634	792,170	767,279
Corporate and other
Segment Reconciliation [Abstract]
Real estate rental revenue									18,990	18,062	17,593
Real estate expenses									5,522	5,036	4,936
Net operating income									13,468	13,026	12,657
Capital expenditures									4,534	4,897	5,994
Total assets	$ 153,547				$ 376,261				$ 153,547	$ 376,261	$ 388,960

Selected Quarterly Financial _3

Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Real estate rental revenue	$ 80,667		$ 80,259		$ 76,820		$ 71,434		$ 71,740		$ 71,001		$ 75,344		$ 73,645		$ 309,180	$ 291,730	$ 280,281
(Loss) income from continuing operations	54,198		(8,432)		(6,191)		(10,443)		(304)		(547)		4,563		(2,559)		29,132	1,153	(3,568)
Net (loss) income	54,198		332,770		987		(4,405)		5,688		5,893		10,750		3,299		383,550	25,630	19,612
Net (loss) income attributable to the controlling interests	$ 54,198		$ 332,770		$ 987		$ (4,405)		$ 5,688		$ 5,893		$ 10,750		$ 3,299		$ 383,550	$ 25,630	$ 19,668
(Loss) income from continuing operations - Basic (in dollars per share)	$ 0.66	[1]	$ (0.10)	[1]	$ (0.08)	[1]	$ (0.13)	[1]	$ 0	[1]	$ (0.01)	[1]	$ 0.06	[1]	$ (0.03)	[1]	$ 0.36	$ 0.01	$ (0.05)
(Loss) income from continuing operations - Diluted (in dollars per share)	0.66	[1]	(0.10)	[1]	(0.08)	[1]	(0.13)	[1]	0	[1]	(0.01)	[1]	0.06	[1]	(0.03)	[1]	0.36	0.01	(0.05)
Net income per share - Basic (in dollars per share)	0.66	[1]	4.14	[1]	0.01	[1]	(0.06)	[1]	0.07	[1]	0.07	[1]	0.14	[1]	0.04	[1]	4.75	0.32	0.25
Net income per share - Diluted (in dollars per share)	$ 0.66	[1]	$ 4.14	[1]	$ 0.01	[1]	$ (0.06)	[1]	$ 0.07	[1]	$ 0.07	[1]	$ 0.13	[1]	$ 0.04	[1]	$ 4.75	$ 0.32	$ 0.25
Gain on sale of real estate	$ 61,000				$ (1,000)								$ 2,500				$ 59,961	$ 2,495	$ 24,915
Gain on sale of real estate			$ 339,000														339,024	0	0
Impairment of real estate							$ 8,400								$ 1,900		$ 8,374	$ 1,886	$ 33,152
[1]	With regard to per share calculations, the sum of the quarterly results may not equal full year results due to rounding.

Shareholders' Equity - Narrativ

Shareholders' Equity - Narrative (Details)	May 04, 2018USD ($)agreement
Class of Stock [Line Items]
Number of equity distribution agreements | agreement	8
2018 Equity Distribution Agreements | Common Class A [Member]
Class of Stock [Line Items]
Common stock reserved for future issuance | $	$ 250,000,000

Shareholders' Equity - Issuance

Shareholders' Equity - Issuances and Net Proceeds on Equity Distribution Agreements (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Issuance of common shares (in shares)	1,859	1,165	3,600
Weighted average price per share (in dollars per share)	$ 30	$ 31.18	$ 32.06
Net proceeds	$ 54,916	$ 35,472	$ 113,194

Shareholders' Equity - Dividend

Shareholders' Equity - Dividend Reinvestment Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dividend Reinvestment Program
Issuance of common shares (in shares)	173	81	80
Weighted average price per share (in dollars per share)	$ 27.58	$ 29.18	$ 32.25
Net proceeds	$ 4,755	$ 1,973	$ 2,576

Deferred Costs - Deferred Lease

Deferred Costs - Deferred Lease Costs and Incentives in Prepaid Expenses and Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Costs, Leasing, Gross	$ 60,900	$ 63,659
Deferred Costs, Leasing, Accumulated Amortization	29,580	31,438
Deferred Costs, Leasing, Net	31,320	32,221
Deferred Leasing Incentives, Gross	18,926	22,801
Accumulated Amortization, Deferred Leasing Incentives	11,133	12,311
Deferred Leasing Incentives, Net	$ 7,793	$ 10,490

Deferred Costs - Amortization a

Deferred Costs - Amortization and Write-Offs of Deferred Leasing Costs and Incentives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred leasing costs amortization	$ 6,599	$ 5,881	$ 5,784
Deferred leasing incentives amortization	$ 2,862	$ 2,811	$ 3,009

Schedule II Valuation and Qua_2

Schedule II Valuation and Qualifying Accounts (Details) - Valuation allowance for deferred tax assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 1,419	$ 1,413	$ 2,882
Additions Charged to Expenses	0	6	0
Net Recoveries	(17)	0	(1,469)
Balance at End of Year	$ 1,402	$ 1,419	$ 1,413

Schedule III Real Estate and _2

Schedule III Real Estate and Accumulated Depreciation - By Property (Details) ft² in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019USD ($)ft²unit		Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Initial Cost
Land	[1]	$ 607,252
Buildings and Improvements	[1]	1,709,463
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		842,746
Gross Amounts at Which Carried
Land		580,297
Buildings and Improvements		2,579,166
Total		3,159,463	[2]	$ 2,973,816	$ 2,831,683	$ 2,725,635
Accumulated Depreciation		$ 712,630		770,535	$ 690,417	$ 657,425
Net Rentable Square Feet (sq ft) | ft²	[3]	9,726
Units | unit		6,658
Carrying value for federal income tax purposes		$ 1,917,800
Investment in development of property		$ 124,193		87,231
Building and improvements | Minimum
Gross Amounts at Which Carried
Useful life (in years)		3 years
Building and improvements | Maximum
Gross Amounts at Which Carried
Useful life (in years)		50 years
The Trove
Gross Amounts at Which Carried
Investment in development of property		$ 110,400
Riverside Apartments land parcel
Gross Amounts at Which Carried
Investment in development of property		25,600
Various development projects
Gross Amounts at Which Carried
Investment in development of property		1,900
Multifamily Properties
Initial Cost
Land	[1]	269,521
Buildings and Improvements	[1]	897,579
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		424,981
Gross Amounts at Which Carried
Land		243,207
Buildings and Improvements		1,348,875
Total		1,592,082
Accumulated Depreciation		$ 260,694
Net Rentable Square Feet (sq ft) | ft²		5,804
Units | unit		6,658
Investment in development of property		$ 123,071		83,945
Multifamily Properties | 3801 Connecticut Avenue | Washington DC
Initial Cost
Land	[1]	420
Buildings and Improvements	[1]	2,678
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		19,357
Gross Amounts at Which Carried
Land		420
Buildings and Improvements		22,035
Total		22,455
Accumulated Depreciation		$ 13,543
Net Rentable Square Feet (sq ft) | ft²		178
Units | unit		307
Depreciation Life	[4]	30 years
Multifamily Properties | Roosevelt Towers | Virginia
Initial Cost
Land	[1]	$ 336
Buildings and Improvements	[1]	1,996
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		13,659
Gross Amounts at Which Carried
Land		336
Buildings and Improvements		15,655
Total		15,991
Accumulated Depreciation		$ 11,418
Net Rentable Square Feet (sq ft) | ft²		170
Units | unit		191
Depreciation Life	[4]	40 years
Multifamily Properties | Park Adams | Virginia
Initial Cost
Land	[1]	$ 287
Buildings and Improvements	[1]	1,654
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		13,636
Gross Amounts at Which Carried
Land		287
Buildings and Improvements		15,290
Total		15,577
Accumulated Depreciation		$ 11,178
Net Rentable Square Feet (sq ft) | ft²		173
Units | unit		200
Depreciation Life	[4]	35 years
Multifamily Properties | The Ashby at McLean | Virginia
Initial Cost
Land	[1]	$ 4,356
Buildings and Improvements	[1]	17,102
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		27,319
Gross Amounts at Which Carried
Land		4,356
Buildings and Improvements		44,421
Total		48,777
Accumulated Depreciation		$ 29,047
Net Rentable Square Feet (sq ft) | ft²		274
Units | unit		256
Depreciation Life	[4]	30 years
Multifamily Properties | Bethesda Hill Apartments | Maryland
Initial Cost
Land	[1]	$ 3,900
Buildings and Improvements	[1]	13,412
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		16,545
Gross Amounts at Which Carried
Land		3,900
Buildings and Improvements		29,957
Total		33,857
Accumulated Depreciation		$ 21,017
Net Rentable Square Feet (sq ft) | ft²		225
Units | unit		195
Depreciation Life	[4]	30 years
Multifamily Properties | Bennett Park | Virginia
Initial Cost
Land	[1]	$ 2,861
Buildings and Improvements	[1]	917
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		81,896
Gross Amounts at Which Carried
Land		4,774
Buildings and Improvements		80,900
Total		85,674
Accumulated Depreciation		$ 40,308
Net Rentable Square Feet (sq ft) | ft²		215
Units | unit		224
Depreciation Life	[4]	28 years
Multifamily Properties | The Clayborne | Virginia
Initial Cost
Land	[1]	$ 269
Buildings and Improvements	[1]	0
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		31,374
Gross Amounts at Which Carried
Land		699
Buildings and Improvements		30,944
Total		31,643
Accumulated Depreciation		$ 16,971
Net Rentable Square Feet (sq ft) | ft²		60
Units | unit		74
Depreciation Life	[4]	26 years
Multifamily Properties | The Kenmore | Washington DC
Initial Cost
Land	[1]	$ 28,222
Buildings and Improvements	[1]	33,955
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		18,109
Gross Amounts at Which Carried
Land		28,222
Buildings and Improvements		52,064
Total		80,286
Accumulated Depreciation		$ 17,415
Net Rentable Square Feet (sq ft) | ft²		268
Units | unit		374
Depreciation Life	[4]	30 years
Multifamily Properties | The Maxwell | Virginia
Initial Cost
Land	[1]	$ 12,787
Buildings and Improvements	[1]	0
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		38,145
Gross Amounts at Which Carried
Land		12,848
Buildings and Improvements		38,084
Total		50,932
Accumulated Depreciation		$ 11,018
Net Rentable Square Feet (sq ft) | ft²		116
Units | unit		163
Depreciation Life	[4]	30 years
Multifamily Properties | The Paramount | Virginia
Initial Cost
Land	[1]	$ 8,568
Buildings and Improvements	[1]	38,716
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		3,101
Gross Amounts at Which Carried
Land		8,568
Buildings and Improvements		41,817
Total		50,385
Accumulated Depreciation		$ 11,261
Net Rentable Square Feet (sq ft) | ft²		141
Units | unit		135
Depreciation Life	[4]	30 years
Multifamily Properties | Yale West | Washington DC
Initial Cost
Land	[1],[5]	$ 14,684
Buildings and Improvements	[1],[5]	62,069
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition	[5]	1,688
Gross Amounts at Which Carried
Land	[5]	14,684
Buildings and Improvements	[5]	63,757
Total	[5]	78,441
Accumulated Depreciation	[5]	$ 13,442
Net Rentable Square Feet (sq ft) | ft²		173
Units | unit		216
Depreciation Life	[4]	30 years
Amount of encumbrances		$ 45,700
Multifamily Properties | The Wellington | Virginia
Initial Cost
Land	[1]	30,548
Buildings and Improvements	[1]	116,563
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		16,178
Gross Amounts at Which Carried
Land		30,548
Buildings and Improvements		132,741
Total		163,289
Accumulated Depreciation		$ 21,947
Net Rentable Square Feet (sq ft) | ft²		600
Units | unit		711
Depreciation Life	[4]	30 years
Multifamily Properties | The Trove | Virginia
Initial Cost
Land	[1],[3]	$ 15,000
Buildings and Improvements	[1],[3]	0
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition	[3]	93,941
Gross Amounts at Which Carried
Land	[3]	2,250
Buildings and Improvements	[3]	106,692
Total	[6]	108,942
Accumulated Depreciation		146
Investment in development of property		96,700
Multifamily Properties | Riverside Apartments | Virginia
Initial Cost
Land	[1]	38,924
Buildings and Improvements	[1]	184,854
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		35,517
Gross Amounts at Which Carried
Land		38,924
Buildings and Improvements		220,371
Total		259,295
Accumulated Depreciation		$ 30,363
Net Rentable Square Feet (sq ft) | ft²		1,001
Units | unit		1,222
Depreciation Life	[4]	30 years
Multifamily Properties | Riverside Apartments land parcel | Virginia
Initial Cost
Land	[1],[3]	$ 15,968
Buildings and Improvements	[1],[3]	0
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition	[3]	9,674
Gross Amounts at Which Carried
Land	[3]	0
Buildings and Improvements	[3]	25,642
Total	[3]	25,642
Accumulated Depreciation	[3]	0
Investment in development of property		25,600
Multifamily Properties | Assembly Alexandria | Virginia
Initial Cost
Land	[1],[3]	23,942
Buildings and Improvements	[1],[3]	93,672
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition	[3]	1,931
Gross Amounts at Which Carried
Land	[3]	23,942
Buildings and Improvements	[3]	95,603
Total	[3]	119,545
Accumulated Depreciation	[3]	$ 2,595
Net Rentable Square Feet (sq ft) | ft²		437
Units | unit		532
Depreciation Life	[4]	30 years
Multifamily Properties | Assembly Manassas | Virginia
Initial Cost
Land	[1],[3]	$ 13,586
Buildings and Improvements	[1],[3]	68,802
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition	[3]	617
Gross Amounts at Which Carried
Land	[3]	13,586
Buildings and Improvements	[3]	69,419
Total	[3]	83,005
Accumulated Depreciation	[3]	$ 2,015
Net Rentable Square Feet (sq ft) | ft²		390
Units | unit		408
Depreciation Life	[4]	30 years
Multifamily Properties | Assembly Dulles | Virginia
Initial Cost
Land	[1],[3]	$ 12,476
Buildings and Improvements	[1],[3]	66,852
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition	[3]	535
Gross Amounts at Which Carried
Land	[3]	12,476
Buildings and Improvements	[3]	67,387
Total	[3]	79,863
Accumulated Depreciation	[3]	$ 1,913
Net Rentable Square Feet (sq ft) | ft²		361
Units | unit		328
Depreciation Life	[4]	30 years
Multifamily Properties | Assembly Leesburg | Virginia
Initial Cost
Land	[1],[3]	$ 4,113
Buildings and Improvements	[1],[3]	21,286
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition	[3]	102
Gross Amounts at Which Carried
Land	[3]	4,113
Buildings and Improvements	[3]	21,388
Total	[3]	25,501
Accumulated Depreciation	[3]	$ 691
Net Rentable Square Feet (sq ft) | ft²		124
Units | unit		134
Depreciation Life	[4]	30 years
Multifamily Properties | Assembly Herndon | Virginia
Initial Cost
Land	[1],[3]	$ 11,225
Buildings and Improvements	[1],[3]	51,534
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition	[3]	690
Gross Amounts at Which Carried
Land	[3]	11,225
Buildings and Improvements	[3]	52,224
Total	[3]	63,449
Accumulated Depreciation	[3]	$ 1,618
Net Rentable Square Feet (sq ft) | ft²		221
Units | unit		283
Depreciation Life	[4]	30 years
Multifamily Properties | Assembly Germantown | Maryland
Initial Cost
Land	[1],[3]	$ 7,609
Buildings and Improvements	[1],[3]	34,431
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition	[3]	179
Gross Amounts at Which Carried
Land	[3]	7,609
Buildings and Improvements	[3]	34,610
Total	[3]	42,219
Accumulated Depreciation	[3]	$ 891
Net Rentable Square Feet (sq ft) | ft²		211
Units | unit		218
Depreciation Life	[4]	30 years
Multifamily Properties | Assembly Watkins Mill | Maryland
Initial Cost
Land	[1],[3]	$ 7,151
Buildings and Improvements	[1],[3]	30,851
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition	[3]	210
Gross Amounts at Which Carried
Land	[3]	7,151
Buildings and Improvements	[3]	31,061
Total	[3]	38,212
Accumulated Depreciation	[3]	$ 756
Net Rentable Square Feet (sq ft) | ft²		193
Units | unit		210
Depreciation Life	[4]	30 years
Multifamily Properties | Cascade at Landmark | Virginia
Initial Cost
Land	[1],[3]	$ 12,289
Buildings and Improvements	[1],[3]	56,235
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition	[3]	578
Gross Amounts at Which Carried
Land	[3]	12,289
Buildings and Improvements	[3]	56,813
Total	[3]	69,102
Accumulated Depreciation	[3]	$ 1,141
Net Rentable Square Feet (sq ft) | ft²		273
Units | unit		277
Depreciation Life	[4]	30 years
Office Buildings
Initial Cost
Land	[1]	$ 304,555
Buildings and Improvements	[1]	730,709
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		370,984
Gross Amounts at Which Carried
Land		304,555
Buildings and Improvements		1,101,693
Total		1,406,248
Accumulated Depreciation		$ 397,699
Net Rentable Square Feet (sq ft) | ft²		3,227
Investment in development of property		$ 478		$ 478
Office Buildings | 1901 Pennsylvania Avenue | Washington DC
Initial Cost
Land	[1]	892
Buildings and Improvements	[1]	3,481
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		20,595
Gross Amounts at Which Carried
Land		892
Buildings and Improvements		24,076
Total		24,968
Accumulated Depreciation		$ 18,613
Net Rentable Square Feet (sq ft) | ft²		101
Depreciation Life	[4]	28 years
Office Buildings | 515 King Street | Virginia
Initial Cost
Land	[1]	$ 4,102
Buildings and Improvements	[1]	3,931
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		9,264
Gross Amounts at Which Carried
Land		4,102
Buildings and Improvements		13,195
Total		17,297
Accumulated Depreciation		$ 7,112
Net Rentable Square Feet (sq ft) | ft²		75
Depreciation Life	[4]	50 years
Office Buildings | 1220 19th Street | Washington DC
Initial Cost
Land	[1]	$ 7,803
Buildings and Improvements	[1]	11,366
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		16,634
Gross Amounts at Which Carried
Land		7,803
Buildings and Improvements		28,000
Total		35,803
Accumulated Depreciation		$ 18,859
Net Rentable Square Feet (sq ft) | ft²		103
Depreciation Life	[4]	30 years
Office Buildings | 1600 Wilson Boulevard | Virginia
Initial Cost
Land	[1]	$ 6,661
Buildings and Improvements	[1]	16,742
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		31,274
Gross Amounts at Which Carried
Land		6,661
Buildings and Improvements		48,016
Total		54,677
Accumulated Depreciation		$ 29,563
Net Rentable Square Feet (sq ft) | ft²		170
Depreciation Life	[4]	30 years
Office Buildings | Silverline Center | Virginia
Initial Cost
Land	[1]	$ 12,049
Buildings and Improvements	[1]	71,825
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		102,283
Gross Amounts at Which Carried
Land		12,049
Buildings and Improvements		174,108
Total		186,157
Accumulated Depreciation		$ 104,536
Net Rentable Square Feet (sq ft) | ft²		549
Depreciation Life	[4]	30 years
Office Buildings | Courthouse Square | Virginia
Initial Cost
Land	[1]	$ 0
Buildings and Improvements	[1]	17,096
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		10,172
Gross Amounts at Which Carried
Land		0
Buildings and Improvements		27,268
Total		27,268
Accumulated Depreciation		$ 17,615
Net Rentable Square Feet (sq ft) | ft²		120
Depreciation Life	[4]	30 years
Office Buildings | Monument II | Virginia
Initial Cost
Land	[1]	$ 10,244
Buildings and Improvements	[1]	65,205
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		12,332
Gross Amounts at Which Carried
Land		10,244
Buildings and Improvements		77,537
Total		87,781
Accumulated Depreciation		$ 35,474
Net Rentable Square Feet (sq ft) | ft²		209
Depreciation Life	[4]	30 years
Office Buildings | 2000 M Street | Washington DC
Initial Cost
Land	[1]	$ 0
Buildings and Improvements	[1]	61,101
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		41,735
Gross Amounts at Which Carried
Land		0
Buildings and Improvements		102,836
Total		102,836
Accumulated Depreciation		$ 40,369
Net Rentable Square Feet (sq ft) | ft²		232
Depreciation Life	[4]	30 years
Office Buildings | 1140 Connecticut Avenue | Washington DC
Initial Cost
Land	[1]	$ 25,226
Buildings and Improvements	[1]	50,495
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		18,799
Gross Amounts at Which Carried
Land		25,226
Buildings and Improvements		69,294
Total		94,520
Accumulated Depreciation		$ 24,486
Net Rentable Square Feet (sq ft) | ft²		184
Depreciation Life	[4]	30 years
Office Buildings | 1227 25th Street | Washington DC
Initial Cost
Land	[1]	$ 17,505
Buildings and Improvements	[1]	21,319
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		11,454
Gross Amounts at Which Carried
Land		17,505
Buildings and Improvements		32,773
Total		50,278
Accumulated Depreciation		$ 11,315
Net Rentable Square Feet (sq ft) | ft²		135
Depreciation Life	[4]	30 years
Office Buildings | John Marshall II | Virginia
Initial Cost
Land	[1]	$ 13,490
Buildings and Improvements	[1]	53,024
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		9,534
Gross Amounts at Which Carried
Land		13,490
Buildings and Improvements		62,558
Total		76,048
Accumulated Depreciation		$ 19,020
Net Rentable Square Feet (sq ft) | ft²		223
Depreciation Life	[4]	30 years
Office Buildings | Fairgate at Ballston | Virginia
Initial Cost
Land	[1]	$ 17,750
Buildings and Improvements	[1]	29,885
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		7,203
Gross Amounts at Which Carried
Land		17,750
Buildings and Improvements		37,088
Total		54,838
Accumulated Depreciation		$ 12,571
Net Rentable Square Feet (sq ft) | ft²		145
Depreciation Life	[4]	30 years
Office Buildings | Army Navy Building | Washington DC
Initial Cost
Land	[1]	$ 30,796
Buildings and Improvements	[1]	39,315
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		13,201
Gross Amounts at Which Carried
Land		30,796
Buildings and Improvements		52,516
Total		83,312
Accumulated Depreciation		$ 13,078
Net Rentable Square Feet (sq ft) | ft²		108
Depreciation Life	[4]	30 years
Office Buildings | 1775 Eye Street, NW | Washington DC
Initial Cost
Land	[1]	$ 48,086
Buildings and Improvements	[1]	51,074
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		16,328
Gross Amounts at Which Carried
Land		48,086
Buildings and Improvements		67,402
Total		115,488
Accumulated Depreciation		$ 17,232
Net Rentable Square Feet (sq ft) | ft²		189
Depreciation Life	[4]	30 years
Office Buildings | Watergate 600 | Washington DC
Initial Cost
Land	[1]	$ 45,981
Buildings and Improvements	[1]	78,325
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		39,225
Gross Amounts at Which Carried
Land		45,981
Buildings and Improvements		117,550
Total		163,531
Accumulated Depreciation		$ 13,419
Net Rentable Square Feet (sq ft) | ft²		293
Depreciation Life	[4]	30 years
Office Buildings | Arlington Tower | Virginia
Initial Cost
Land	[1]	$ 63,970
Buildings and Improvements	[1]	156,525
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		10,951
Gross Amounts at Which Carried
Land		63,970
Buildings and Improvements		167,476
Total		231,446
Accumulated Depreciation		$ 14,437
Net Rentable Square Feet (sq ft) | ft²		391
Depreciation Life	[4]	30 years
Retail Centers
Initial Cost
Land	[1]	$ 33,176
Buildings and Improvements	[1]	81,175
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		46,781
Gross Amounts at Which Carried
Land		32,535
Buildings and Improvements		128,598
Total		161,133
Accumulated Depreciation		$ 54,237
Net Rentable Square Feet (sq ft) | ft²		695
Retail Centers | Takoma Park | Maryland
Initial Cost
Land	[1]	$ 415
Buildings and Improvements	[1]	1,084
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		289
Gross Amounts at Which Carried
Land		366
Buildings and Improvements		1,423
Total		1,789
Accumulated Depreciation		$ 1,205
Net Rentable Square Feet (sq ft) | ft²		51
Depreciation Life	[4]	50 years
Retail Centers | Westminster | Maryland
Initial Cost
Land	[1]	$ 519
Buildings and Improvements	[1]	1,775
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		9,988
Gross Amounts at Which Carried
Land		519
Buildings and Improvements		11,763
Total		12,282
Accumulated Depreciation		$ 8,614
Net Rentable Square Feet (sq ft) | ft²		150
Depreciation Life	[4]	37 years
Retail Centers | Concord Centre | Virginia
Initial Cost
Land	[1]	$ 413
Buildings and Improvements	[1]	850
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		7,415
Gross Amounts at Which Carried
Land		413
Buildings and Improvements		8,265
Total		8,678
Accumulated Depreciation		$ 4,036
Net Rentable Square Feet (sq ft) | ft²		75
Depreciation Life	[4]	33 years
Retail Centers | Chevy Chase Metro Plaza | Washington DC
Initial Cost
Land	[1]	$ 1,549
Buildings and Improvements	[1]	4,304
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		8,377
Gross Amounts at Which Carried
Land		1,549
Buildings and Improvements		12,681
Total		14,230
Accumulated Depreciation		$ 8,287
Net Rentable Square Feet (sq ft) | ft²		49
Depreciation Life	[4]	50 years
Retail Centers | 800 S. Washington Street | Virginia
Initial Cost
Land	[1]	$ 2,904
Buildings and Improvements	[1]	5,489
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		6,168
Gross Amounts at Which Carried
Land		2,904
Buildings and Improvements		11,657
Total		14,561
Accumulated Depreciation		$ 6,196
Net Rentable Square Feet (sq ft) | ft²		46
Depreciation Life	[4]	30 years
Retail Centers | Randolph Shopping Center | Maryland
Initial Cost
Land	[1]	$ 4,928
Buildings and Improvements	[1]	13,025
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		1,200
Gross Amounts at Which Carried
Land		4,928
Buildings and Improvements		14,225
Total		19,153
Accumulated Depreciation		$ 6,846
Net Rentable Square Feet (sq ft) | ft²		83
Depreciation Life	[4]	30 years
Retail Centers | Montrose Shopping Center | Maryland
Initial Cost
Land	[1]	$ 11,612
Buildings and Improvements	[1]	22,410
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		2,604
Gross Amounts at Which Carried
Land		11,020
Buildings and Improvements		25,606
Total		36,626
Accumulated Depreciation		$ 11,856
Net Rentable Square Feet (sq ft) | ft²		149
Depreciation Life	[4]	30 years
Retail Centers | Spring Valley Village | Washington DC
Initial Cost
Land	[1]	$ 10,836
Buildings and Improvements	[1]	32,238
Net Improvements (Retirement) since Acquisition
Net Improvements (Retirement) since Acquisition		10,740
Gross Amounts at Which Carried
Land		10,836
Buildings and Improvements		42,978
Total		53,814
Accumulated Depreciation		$ 7,197
Net Rentable Square Feet (sq ft) | ft²		92
Depreciation Life	[4]	30 years
[1]	The purchase cost of real estate investments has been divided between land and buildings and improvements on the basis of management’s determination of the fair values.
[2]	At December 31, 2019 , total land, buildings and improvements are carried at $1,917.8 million for federal income tax purposes.
[3]	As of December 31, 2019 , WashREIT had under development multifamily properties, The Trove and Riverside Apartments land parcel. The value not yet placed into service at December 31, 2019 was $96.7 million and $25.6 million , respectively.
[4]	The useful life shown is for the main structure. Buildings and improvements are depreciated over various useful lives ranging from 3 to 50 years.
[5]	At December 31, 2019 , our properties were encumbered by non-recourse mortgage amounts of $45.7 million on Yale West. Mortgage amounts exclude premiums and debt loan costs.
[6]	As of December 31, 2019 , WashREIT had investments in various development, redevelopment and renovation projects, including The Ashby at McLean, Montrose Shopping Center, Silverline Center, Takoma Park and The Paramount. The total value of these projects, which has not yet been placed in service, is $1.9 million at December 31, 2019

Schedule III Real Estate and _3

Schedule III Real Estate and Accumulated Depreciation - Reconciliation of Real Estate Assets and Accumulated Depreciation (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Real estate assets
Balance, beginning of period		$ 2,973,816		$ 2,831,683	$ 2,725,635
Property acquisitions	[1]	516,054		220,495	124,306
Improvements	[1]	140,109		103,404	84,560
Impairment write-down		(24,432)		(2,177)	(81,982)
Write-off of disposed assets		(7,430)		(2,132)	(2,655)
Property sales		(438,654)		(177,457)	(18,181)
Balance, end of period		3,159,463	[2]	2,973,816	2,831,683
Accumulated depreciation
Balance, beginning of period		770,535		690,417	657,425
Depreciation		107,938		98,141	94,558
Impairment write-down		(16,058)		(291)	(48,830)
Write-off of disposed assets		(2,173)		(1,859)	(1,708)
Property sales		(147,612)		(15,873)	(11,028)
Balance, end of period		$ 712,630		$ 770,535	$ 690,417
[1]	Includes non-cash accruals for capital items.
[2]	At December 31, 2019 , total land, buildings and improvements are carried at $1,917.8 million for federal income tax purposes.

Uncategorized Items - wre10-kx1

Label	Element	Value
Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (906,000)
Accumulated Distributions in Excess of Net Income [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (906,000)