Office Properties Income Trust (OPI) 10-K 16 Feb 22 2021 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Feb. 15, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-34364
Entity Registrant Name	OFFICE PROPERTIES INCOME TRUST
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	26-4273474
Entity Address, Address Line One	Two Newton Place
Entity Address, Address Line Two	255 Washington Street
Entity Address, Address Line Three	Suite 300
Entity Address, City or Town	Newton
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02458-1634
City Area Code	617
Local Phone Number	219-1440
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 1.4
Entity Common Stock, Shares Outstanding		48,425,665
Documents Incorporated by Reference	Certain information required by Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K is incorporated by reference to our definitive Proxy Statement for the 2022 Annual Meeting of Shareholders, to be filed with the Securities and Exchange Commission within 120 days after the fiscal year ended December 31, 2021.
Entity Central Index Key	0001456772
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Shares
Document Information [Line Items]
Title of 12(b) Security	Common Shares of Beneficial Interest
Trading Symbol	OPI
Security Exchange Name	NASDAQ
6.375% Senior Notes Due 2050
Document Information [Line Items]
Title of 12(b) Security	6.375% Senior Notes due 2050
Trading Symbol	OPINL
Security Exchange Name	NASDAQ

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2019
Auditor [Line Items]
Auditor Name	Deloitte & Touche LLP	Ernst & Young LLP
Auditor Location	Boston, Massachusetts	Boston, Massachusetts
Auditor Firm ID	34	42

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Real estate properties:
Land	$ 874,108	$ 830,884
Buildings and improvements	3,036,978	2,691,259
Total real estate properties, gross	3,911,086	3,522,143
Accumulated depreciation	(495,912)	(451,914)
Total real estate properties, net	3,415,174	3,070,229
Assets of properties held for sale	26,598	75,177
Investments in unconsolidated joint ventures	34,838	37,951
Acquired real estate leases, net	505,629	548,943
Cash and cash equivalents	83,026	42,045
Restricted cash	1,489	14,810
Rents receivable	112,886	101,766
Deferred leasing costs, net	53,883	42,626
Other assets, net	8,160	12,889
Total assets	4,241,683	3,946,436
LIABILITIES AND SHAREHOLDERS’ EQUITY
Unsecured revolving credit facility	0	0
Senior unsecured notes, net	2,479,772	2,033,242
Mortgage notes payable, net	98,178	169,729
Liabilities of properties held for sale	594	891
Accounts payable and other liabilities	142,609	116,480
Due to related persons	6,787	6,114
Assumed real estate lease obligations, net	17,034	10,588
Total liabilities	2,744,974	2,337,044
Commitments and contingencies
Shareholders’ equity:
Common shares of beneficial interest, $.01 par value: 200,000,000 shares authorized, 48,425,665 and 48,318,366 shares issued and outstanding, respectively	484	483
Additional paid in capital	2,617,169	2,615,305
Cumulative net income	175,715	183,895
Cumulative common distributions	(1,296,659)	(1,190,291)
Total shareholders’ equity	1,496,709	1,609,392
Total liabilities and shareholders’ equity	$ 4,241,683	$ 3,946,436

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Common shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares of beneficial interest, shares authorized (in shares)	200,000,000	200,000,000
Common shares of beneficial interest, shares issued (in shares)	48,425,665	48,318,366
Common shares of beneficial interest, shares outstanding (in shares)	48,425,665	48,318,366

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Rental income	$ 576,482	$ 587,919	$ 678,404
Expenses:
Real estate taxes	71,970	65,119	73,717
Utility expenses	25,251	25,384	34,302
Other operating expenses	105,825	105,465	120,943
Depreciation and amortization	241,494	251,566	289,885
Loss on Impairment of Real Estate	62,420	2,954	22,255
Acquisition and transaction related costs	0	232	682
General and administrative	26,858	28,443	32,728
Total expenses	533,818	479,163	574,512
Gain on sale of real estate	78,354	10,855	105,131
Dividend income	0	0	1,960
Loss on equity securities, net	0	0	(44,007)
Interest and other income	7	779	1,045
Interest expense (including net amortization of debt premiums, discounts and issuance costs of $9,771, $9,593 and $10,740, respectively)	(112,385)	(108,303)	(134,880)
Loss on early extinguishment of debt	(14,068)	(3,839)	(769)
Income (loss) before income tax expense and equity in net losses of investees	(5,428)	8,248	32,372
Income tax expense	(251)	(377)	(778)
Equity in net losses of investees	(2,501)	(1,193)	(1,259)
Net income (loss)	(8,180)	6,678	30,335
Other comprehensive income (loss):
Unrealized gain (loss) on financial instrument	0	200	(200)
Equity in unrealized loss of investees	0	0	(106)
Other comprehensive income (loss)	0	200	(306)
Comprehensive income (loss)	$ (8,180)	$ 6,878	$ 30,029
Weighted average common shares outstanding, basic (in shares)	48,195	48,124	48,062
Weighted average common shares outstanding, diluted (in shares)	48,195	48,124	48,062
Per common share amounts (basic and diluted):
Net income (loss) per share, basic	$ (0.17)	$ 0.14	$ 0.63
Net income (loss) per share, diluted	$ (0.17)	$ 0.14	$ 0.63

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net amortization of debt premiums, discounts and issuance costs	$ 9,771	$ 9,593	$ 10,740

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Additional Paid In Capital	Cumulative Net Income	Cumulative Other Comprehensive Income (Loss)	Cumulative Common Distributions
Balance beginning (in shares) at Dec. 31, 2018		48,082,903
Balance beginning at Dec. 31, 2018	$ 1,778,968	$ 481	$ 2,609,801	$ 146,882	$ 106	$ (978,302)
Increase (Decrease) in Shareholders' Equity
Share grants (in shares)		136,100
Share grants	3,098	$ 1	3,097
Shares forfeitures or repurchases (in shares)		(17,062)
Share forfeitures and repurchases	(473)		(473)
Amounts reclassified from cumulative other comprehensive income to net income	(196)				(196)
Equity in unrealized gain of investees	90				90
Unrealized loss on financial instrument	(200)				(200)
Net income	30,335			30,335
Distributions to common shareholders	(105,868)					(105,868)
Balance ending (in shares) at Dec. 31, 2019		48,201,941
Balance ending at Dec. 31, 2019	1,705,754	$ 482	2,612,425	177,217	(200)	(1,084,170)
Increase (Decrease) in Shareholders' Equity
Share grants (in shares)		136,600
Share grants	3,324	$ 1	3,323
Shares forfeitures or repurchases (in shares)		(20,175)
Share forfeitures and repurchases	(443)		(443)
Amounts reclassified from cumulative other comprehensive income to net income	85				85
Unrealized loss on financial instrument	115				115
Net income	6,678			6,678
Distributions to common shareholders	(106,121)					(106,121)
Balance ending (in shares) at Dec. 31, 2020		48,318,366
Balance ending at Dec. 31, 2020	1,609,392	$ 483	2,615,305	183,895	0	(1,190,291)
Increase (Decrease) in Shareholders' Equity
Share grants (in shares)		145,800
Share grants	2,873	$ 1	2,872
Shares forfeitures or repurchases (in shares)		(38,501)
Share forfeitures and repurchases	(1,008)		(1,008)
Net income	(8,180)			(8,180)
Distributions to common shareholders	(106,368)					(106,368)
Balance ending (in shares) at Dec. 31, 2021		48,425,665
Balance ending at Dec. 31, 2021	$ 1,496,709	$ 484	$ 2,617,169	$ 175,715	$ 0	$ (1,296,659)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (8,180)	$ 6,678	$ 30,335
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	92,266	83,828	89,400
Net amortization of debt premiums, discounts and issuance costs	9,771	9,593	10,740
Amortization of acquired real estate leases	144,826	167,192	197,978
Amortization of deferred leasing costs	7,878	6,887	5,973
Gain on sale of real estate	(78,354)	(10,855)	(105,131)
Loss on impairment of real estate	62,420	2,954	22,255
Loss on early extinguishment of debt	9,694	2,701	769
Straight line rental income	(15,368)	(16,079)	(27,507)
Other non-cash expenses, net	1,782	2,229	2,011
Loss on equity securities, net	0	0	44,007
Equity in net losses of investees	2,501	1,193	1,259
Change in assets and liabilities:
Rents receivable	2,663	(3,962)	12,586
Deferred leasing costs	(19,769)	(12,128)	(27,971)
Other assets	1,538	2,505	3,266
Accounts payable and other liabilities	7,151	(8,081)	(19,333)
Due to related persons	673	(1,027)	(27,746)
Net cash provided by operating activities	221,492	233,628	215,329
CASH FLOWS FROM INVESTING ACTIVITIES:
Real estate acquisitions	(563,447)	(47,215)	(2,905)
Real estate improvements	(100,141)	(81,762)	(62,676)
Proceeds from sale of properties, net	219,980	102,211	829,794
Proceeds from repayment of mortgage note receivable	0	2,880	0
Net cash (used in) provided by investing activities	(442,985)	(22,987)	877,819
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of mortgage notes payable	(72,541)	(155,367)	(12,054)
Repayment of unsecured term loans	0	0	(388,000)
Repayment of senior unsecured notes	(610,000)	(400,000)	(350,000)
Proceeds from issuance of senior unsecured notes, net	1,041,809	408,932	0
Borrowings on unsecured revolving credit facility	755,000	561,467	430,000
Repayments on unsecured revolving credit facility	(755,000)	(561,467)	(605,000)
Payment of debt issuance costs	(2,744)	(1,492)	0
Repurchase of common shares	(1,003)	(434)	(473)
Distributions to common shareholders	(106,368)	(106,121)	(105,868)
Net cash provided by (used in) financing activities	249,153	(254,482)	(1,031,395)
Increase (decrease) in cash, cash equivalents and restricted cash	27,660	(43,841)	61,753
Cash, cash equivalents and restricted cash at beginning of period	56,855	100,696	38,943
Cash, cash equivalents and restricted cash at end of period	84,515	56,855	100,696
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	103,200	100,083	131,735
Income taxes paid	299	1,377	491
NON-CASH INVESTING ACTIVITIES:
Real estate improvements accrued, not paid	18,492	11,981	11,457
Real estate acquisition	(13,031)	0	0
Capitalized interest	795	199	26
SUPPLEMENTAL DISCLOSURE OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Cash and cash equivalents	83,026	42,045	93,744
Restricted cash	1,489	14,810	6,952
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows	84,515	56,855	100,696
AIC
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Distribution of earnings from Affiliates Insurance Company	0	0	2,438
CASH FLOWS FROM INVESTING ACTIVITIES:
Distributions in excess of earnings	11	287	6,562
Unconsolidated Joint Ventures
CASH FLOWS FROM INVESTING ACTIVITIES:
Distributions in excess of earnings	612	612	2,370
RMR Inc
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sale of The RMR Group Inc. common shares, net	$ 0	$ 0	$ 104,674

Organization

Organization	12 Months Ended
	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	OrganizationOffice Properties Income Trust, or OPI, we, us or our, is a real estate investment trust, or REIT, formed in 2009 under Maryland law.As of December 31, 2021, our wholly owned properties were comprised of 178 properties containing approximately 23,271,000 rentable square feet and we had noncontrolling ownership interests of 51% and 50% in two unconsolidated joint ventures that own three properties totaling approximately 444,000 rentable square feet.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation. These consolidated financial statements include the accounts of us and our subsidiaries, all of which are wholly owned directly or indirectly by us. All intercompany transactions and balances with or among our consolidated subsidiaries have been eliminated. Real Estate Properties. We record our properties at cost and provide depreciation on real estate investments on a straight line basis over estimated useful lives generally ranging from 7 to 40 years. In some circumstances, we engage independent real estate appraisal firms to provide market information and evaluations which are relevant to our purchase price allocations and determinations of useful lives; however, we are ultimately responsible for the purchase price allocations and determinations of useful lives. We allocate the purchase prices of our properties to land, buildings and improvements based on determinations of the relative fair values of these assets assuming the properties are vacant. We determine the fair value of each property using methods similar to those used by independent appraisers, which may involve estimated cash flows that are based on a number of factors, including capitalization rates and discount rates, among others. We allocate a portion of the purchase price of our properties to above market and below market leases based on the present value (using an interest rate which reflects the risks associated with acquired in place leases at the time each property was acquired by us) of the difference, if any, between (i) the contractual amounts to be paid pursuant to the acquired in place leases and (ii) our estimates of fair market lease rates for the corresponding leases, measured over a period equal to the terms of the respective leases. We allocate a portion of the purchase price to acquired in place leases and tenant relationships based upon market estimates to lease up the property based on the leases in place at the time of purchase. We allocate this aggregate value between acquired in place lease values and tenant relationships based on our evaluation of the specific characteristics of each tenant’s lease. However, we have not separated the value of tenant relationships from the value of acquired in place leases because such value and related amortization expense is immaterial to the accompanying consolidated financial statements. In making these allocations, we consider factors such as estimated carrying costs during the expected lease up periods, including real estate taxes, insurance and other operating income and expenses and costs, such as leasing commissions, legal and other related expenses, to execute similar leases in current market conditions at the time a property was acquired by us. If the value of tenant relationships becomes material in the future, we may separately allocate those amounts and amortize the allocated amounts over the estimated life of the relationships. For transactions that qualify as business combinations, we allocate the excess, if any, of the consideration over the fair value of the assets acquired to goodwill. We amortize capitalized above market lease values (included in acquired real estate leases, net in our consolidated balance sheets) and below market lease values (presented as assumed real estate lease obligations, net in our consolidated balance sheets) as a reduction or increase, respectively, to rental income over the terms of the associated leases. Such amortization resulted in net decreases to rental income of $2,288, $5,440 and $2,710 during the years ended December 31, 2021, 2020 and 2019, respectively. We amortize the value of acquired in place leases (included in acquired real estate leases, net in our consolidated balance sheets), exclusive of the value of above market and below market acquired in place leases, over the terms of the associated leases. Such amortization, which is included in depreciation and amortization expense, amounted to $142,538, $161,752 and $195,268 during the years ended December 31, 2021, 2020 and 2019, respectively. If a lease is terminated prior to its stated expiration, we write off the unamortized amounts relating to that lease. As of December 31, 2021 and 2020, our acquired real estate leases and assumed real estate lease obligations, excluding properties classified as held for sale, were as follows: December 31, 2021 2020 Acquired real estate leases: Capitalized above market lease values $ 29,925 $ 34,972 Less: accumulated amortization (17,945) (19,291) Capitalized above market lease values, net 11,980 15,681 Lease origination value 885,250 868,459 Less: accumulated amortization (391,601) (335,197) Lease origination value, net 493,649 533,262 Acquired real estate leases, net $ 505,629 $ 548,943 Assumed real estate lease obligations: Capitalized below market lease values $ 29,488 $ 21,092 Less: accumulated amortization (12,454) (10,504) Assumed real estate lease obligations, net $ 17,034 $ 10,588 As of December 31, 2021, the weighted average amortization periods for capitalized above market leases, lease origination value and capitalized below market lease values were 3.3 years, 6.3 years and 10.3 years, respectively. Future amortization of net intangible lease assets and liabilities, to be recognized over the current terms of the associated leases as of December 31, 2021 are estimated to be $121,814 in 2022, $99,643 in 2023, $77,107 in 2024, $56,168 in 2025, $41,393 in 2026 and $92,470 thereafter. We regularly evaluate whether events or changes in circumstances have occurred that could indicate an impairment in the value of long lived assets. If there is an indication that the carrying value of an asset is not recoverable, we estimate the projected undiscounted cash flows to determine if an impairment loss should be recognized. The future net undiscounted cash flows are subjective and are based in part on assumptions regarding hold periods, market rents and terminal capitalization rates. We determine the amount of any impairment loss by comparing the historical carrying value to estimated fair value. We estimate fair value through an evaluation of recent financial performance and projected discounted cash flows using standard industry valuation techniques. In addition to consideration of impairment upon the events or changes in circumstances described above, we regularly evaluate the remaining lives of our long lived assets. If we change our estimate of the remaining lives, we allocate the carrying value of the affected assets over their revised remaining lives. Cash and Cash Equivalents. We consider highly liquid investments with original maturities of three months or less at the date of purchase to be cash equivalents. Restricted Cash. Restricted cash consists of amounts escrowed for future real estate taxes, insurance, leasing costs, capital expenditures and debt service, as required by certain of our mortgage debts. Deferred Leasing Costs . Deferred leasing costs include brokerage costs and inducements associated with our entering leases. We amortize deferred leasing costs, which are included in depreciation and amortization expense, and inducements, which are included as a reduction to rental income, on a straight line basis over the terms of the respective leases. Legal costs associated with the execution of our leases are expensed as incurred and included in general and administrative expenses in our consolidated statements of comprehensive income (loss). We recorded amortization of deferred leasing costs of $6,691, $5,985 and $5,216, and reductions to rental income related to the amortization of inducements of $1,187, $902 and $757 for the years ended December 31, 2021, 2020 and 2019, respectively. Deferred leasing costs, excluding properties classified as held for sale, totaled $74,469 and $59,691 at December 31, 2021 and 2020, respectively, and accumulated amortization of deferred leasing costs totaled $20,586 and $17,065 at December 31, 2021 and 2020, respectively. Future amortization of deferred leasing costs to be recognized during the current terms of our existing leases as of December 31, 2021 are estimated to be $8,536 in 2022, $7,798 in 2023, $6,739 in 2024, $5,784 in 2025, $5,132 in 2026 and $19,894 thereafter. Debt Issuance Costs . Costs related to the issuance or assumption of debt are capitalized and amortized to interest expense over the terms of the respective loans. Debt issuance costs, net of accumulated amortization, for our revolving credit facility are included in other assets in our consolidated balance sheets. As of December 31, 2021 and 2020, debt issuance costs for our revolving credit facility were $4,125 and accumulated amortization of debt issuance costs for our revolving credit facility were $3,079 and $2,069, respectively. Debt issuance costs, net of accumulated amortization, for our senior unsecured notes and mortgage notes payable are presented as a direct deduction from the associated debt liability in our consolidated balance sheets. As of December 31, 2021 and 2020, debt issuance costs, net of accumulated amortization, for our senior unsecured notes and mortgage notes payable totaled $16,120 and $17,545, respectively. Future amortization of debt issuance costs to be recognized with respect to our revolving credit facility, senior unsecured notes and mortgage notes as of December 31, 2021 are estimated to be $3,514 in 2022, $2,217 in 2023, $2,155 in 2024, $1,669 in 2025, $1,335 in 2026 and $6,276 thereafter. Equity Securities. We previously owned 2,801,060 common shares of class A common stock of The RMR Group Inc., or RMR Inc. Prior to the sale of our shares of RMR Inc. class A common stock on July 1, 2019, our equity securities were recorded at fair value based on their quoted market price at the end of each reporting period. See Note 6 for more information regarding the sale of our RMR Inc. class A common stock. Equity Method Investments. We previously accounted for our investment in Affiliates Insurance Company, or AIC, until AIC was dissolved on February 13, 2020, using the equity method of accounting. Significant influence was present through common representation on the boards of trustees or directors of us and AIC. See Note 6 for more information regarding our investment in AIC. We also have noncontrolling ownership interests of 51% and 50% in two unconsolidated joint ventures that own three properties. The properties owned by these joint ventures are encumbered by an aggregate of $82,000 of mortgage indebtedness. We do not control the activities that are most significant to these joint ventures and, as a result, we account for our investments in these joint ventures under the equity method of accounting. See Note 3 for more information regarding our unconsolidated joint ventures. We periodically evaluate our equity method investments for possible indicators of other than temporary impairment whenever events or changes in circumstances indicate the carrying amount of the investment might not be recoverable. These indicators may include the length of time and the extent to which the market value of our investment is below our carrying value, the financial condition of our investees, our intent and ability to be a long term holder of the investment and other considerations. If the decline in fair value is judged to be other than temporary, we record an impairment charge to adjust the basis of the investment to its estimated fair value. Other Liabilities. We initially acquired 1,541,201 shares of class A common stock of RMR Inc. on June 5, 2015 for cash and share consideration of $17,462. We concluded, for accounting purposes, that the cash and share consideration we paid for our investment in these shares represented a discount to the fair value of these shares. We initially accounted for this investment under the cost method of accounting and recorded this investment at its estimated fair value of $39,833 as of June 5, 2015 using Level 3 inputs, as defined in the fair value hierarchy under U.S. generally accepted accounting principles, or GAAP. As a result, we recorded a liability for the amount by which the estimated fair value of these shares exceeded the price we paid for these shares. This liability is included in accounts payable and other liabilities in our consolidated balance sheets. This liability is being amortized on a straight line basis through December 31, 2035 as an allocated reduction to our business management and property management fee expense. We amortized $1,087 of this liability during each of the years ended December 31, 2021, 2020 and 2019. These amounts are included in the net business management and property management fee amounts for such periods disclosed in Note 5. As of December 31, 2021, the remaining unamortized amount of this liability was $15,232. Future amortization of this liability as of December 31, 2021 is estimated to be $1,087 in 2022 through 2026 and $9,797 thereafter. Revenue Recognition. We are a lessor of commercial office properties. Our leases provide our tenants with the contractual right to use and economically benefit from all of the physical space specified in the leases; therefore, we have determined to evaluate our leases as lease arrangements. Our leases provide for base rent payments and in addition may include variable payments. Rental income from operating leases, including any payments derived by index or market-based indices, is recognized on a straight line basis over the lease term when we have determined that the collectability of substantially all of the lease payments is probable. Some of our leases have options to extend or terminate the lease exercisable at the option of our tenants, which are considered when determining the lease term. Allowances for bad debts are recognized as a direct reduction of rental income. Certain of our leases contain non-lease components, such as property level operating expenses and capital expenditures reimbursed by our tenants as well as other required lease payments. We have made the policy election to not separate the lease and non-lease components because (i) the lease components are operating leases and (ii) the timing and pattern of recognition of the non-lease components are the same as those of the lease components. We apply Accounting Standards Codification 842, Leases , to the combined component. Income derived by our leases is recorded in rental income in our consolidated statements of comprehensive income (loss). Certain tenants are obligated to pay directly their obligations under their leases for insurance, real estate taxes and certain other expenses. These obligations, which have been assumed by the tenants under the terms of their respective leases, are not reflected in our consolidated financial statements. To the extent any tenant responsible for any such obligations under the applicable lease defaults on such lease or if it is deemed probable that the tenant will fail to pay for such obligations, we would record a liability for such obligations. See Note 4 for more information regarding our leases. Income Taxes. We have elected to be taxed as a REIT under the United States Internal Revenue Code of 1986, as amended, and, accordingly, we generally will not be subject to federal income taxes provided we distribute our taxable income and meet certain other requirements to qualify for taxation as a REIT. We are, however, subject to certain state and local taxes. Cumulative Other Comprehensive Income (Loss). Cumulative other comprehensive income (loss) represents our share of the cumulative comprehensive income and losses of our equity method investees. Per Common Share Amounts. We calculate basic earnings per common share by dividing net income (loss) by the weighted average number of our common shares of beneficial ownership, $.01 par value, or our common shares, outstanding during the period. We calculate diluted earnings per share using the more dilutive of the two class method or the treasury stock method. Unvested share awards and other potentially dilutive common shares, together with the related impact on earnings, are considered when calculating diluted earnings per share. For the years ended December 31, 2021, 2020 and 2019, there were no dilutive common shares. In addition, for the years ended December 31, 2021, 2020 and 2019, 34, 14 and 12 unvested common shares, respectively, were not included in the calculation of diluted earnings per share because to do so would have been antidilutive. Use of Estimates. Preparation of these financial statements in conformity with GAAP requires us to make estimates and assumptions that may affect the amounts reported in these consolidated financial statements and related notes. The actual results could differ from these estimates. Significant estimates in the consolidated financial statements include purchase price allocations, useful lives of fixed assets and assessment of impairment of real estate and the related intangibles. Segment Reporting. We operate in one business segment: direct ownership of real estate properties. New Accounting Pronouncements. In October 2021, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, No. 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers , or ASU No. 2021-08, which requires that an acquirer account for the related revenue contracts in accordance with Topic 606 as if it had originated the contracts. The acquiring entity shall recognize and measure the acquired contract assets and contract liabilities consistent with how they were recognized and measured in the acquiree’s financial statements, rather than at fair value at the acquisition date. ASU No. 2021-08 is effective for fiscal years beginning after December 15, 2022, with early adoption permitted. On October 1, 2021, we early adopted ASU No. 2021-08. The adoption of ASU No. 2021-08 did not have an impact on our consolidated financial statements.

Real Estate Properties

Real Estate Properties	12 Months Ended
	Dec. 31, 2021
Real Estate [Abstract]
Real Estate Properties	Real Estate PropertiesAs of December 31, 2021, our wholly owned properties were comprised of 178 properties containing approximately 23,271,000 rentable square feet, with an aggregate undepreciated carrying value of $3,938,876, including $27,790 classified as held for sale. We also had noncontrolling ownership interests of 51% and 50% in two unconsolidated joint ventures that own three properties totaling approximately 444,000 rentable square feet. We generally lease space at our properties on a gross lease, modified gross lease or net lease basis pursuant to fixed term contracts expiring between 2022 and 2053. Some of our leases generally require us to pay all or some property operating expenses and to provide all or most property management services. During the year ended December 31, 2021, we entered into 85 leases for approximately 2,484,000 rentable square feet for a weighted (by rentable square feet) average lease term of 9.5 years and we made commitments for approximately $142,318 of leasing related costs. As of December 31, 2021, we have estimated unspent leasing related obligations of $121,754. 2021 Acquisition Activities During the year ended December 31, 2021, we acquired three properties containing approximately 926,000 rentable square feet for an aggregate purchase price of $576,478, including net purchase price adjustments of $1,761 and acquisition related costs of $1,264. These acquisitions were accounted for as asset acquisitions. We allocated the purchase prices of these acquisitions based on the relative estimated fair values of the acquired assets and assumed liabilities as follows: Acquisition Date Location Number of Properties Rentable Square Feet Purchase Price Land Buildings and Improvements Acquired Real Estate Leases Assumed Real Estate Lease Obligations June 2021 Chicago, IL (1) 1 531,000 $ 368,331 $ 42,935 $ 258,348 $ 76,136 $ (9,088) June 2021 Atlanta, GA 1 346,000 180,602 13,040 135,459 32,103 — August 2021 Boston, MA 1 49,000 27,545 16,103 10,217 1,225 — 3 926,000 $ 576,478 $ 72,078 $ 404,024 $ 109,464 $ (9,088) (1) Purchase price includes an adjustment of $13,031 to record an estimated real estate tax liability as of the acquisition date. 2020 Acquisition Activities During the year ended December 31, 2020, we acquired two properties containing approximately 163,000 rentable square feet for an aggregate purchase price of $47,215, including capitalized acquisition related costs of $590. These acquisitions were accounted for as asset acquisitions. We allocated the purchase prices of these acquisitions based on the relative estimated fair values of the acquired assets as follows: Acquisition Date Location Number of Properties Rentable Square Feet Purchase Price Land Buildings and Improvements Acquired Real Estate Leases February 2020 Boston, MA 1 13,000 $ 11,864 $ 2,618 $ 9,246 $ — December 2020 Fort Mill, SC 1 150,000 35,351 5,031 22,526 7,794 2 163,000 $ 47,215 $ 7,649 $ 31,772 $ 7,794 2019 Acquisition Activities In November 2019, we acquired a land parcel adjacent to a property we own in Boston, MA for $2,900, excluding acquisition related costs. Disposition Activities The sales completed during the years ended December 31, 2021, 2020 and 2019, as presented in the tables below, do not represent significant dispositions individually (unless otherwise noted) or in the aggregate, nor do they represent a strategic shift in our business. As a result, the results of operations of these properties are included in continuing operations through the date of sale in our consolidated statements of comprehensive income (loss). 2021 Disposition Activities During the year ended December 31, 2021, we sold six properties, a warehouse facility adjacent to a property we own located in Kansas, MO and two vacant land parcels adjacent to properties we own located in Sterling, VA containing approximately 2,565,000 rentable square feet for an aggregate sales price of $226,915, excluding closing costs. Date of Sale Number of Properties Location Rentable Square Feet Gross Sales Price (1) Gain (Loss) on Sale of Real Estate Loss on Impairment of Real Estate January 2021 — Kansas City, MO (2) (3) 10,000 $ 845 $ (63) $ — January 2021 1 Richmond, VA (2) 311,000 130,000 54,181 — April 2021 1 Huntsville, AL 1,371,000 39,000 — 5,383 July 2021 1 Fresno, CA 532,000 6,000 — 33,902 July 2021 1 Liverpool, NY 38,000 650 31 — August 2021 1 Memphis, TN 205,000 15,270 287 — September 2021 1 Stoneham, MA 98,000 6,650 (282) 5,911 October 2021 — Sterling, VA (4) — 28,500 24,200 — 6 2,565,000 $ 226,915 $ 78,354 $ 45,196 (1) Gross sales price is the gross contract price, excluding closing costs. (2) Properties were classified as held for sale as of December 31, 2020. (3) Consists of a warehouse facility adjacent to a property we own located in Kansas City, MO. (4) Consists of two vacant land parcels adjacent to properties we own located in Sterling, VA. As of December 31, 2021, the following four properties met the criteria to be classified as held for sale in our consolidated balance sheet: Date of Sale Agreement Location Number of Properties Rentable Square Feet Gross Sales Price (1) Loss on Impairment of Real Estate December 2021 Rockville, MD (2) 1 129,000 $ 6,750 $ 6,236 December 2021 Chesapeake, VA (3) 2 172,000 18,945 — January 2022 Milwaukee, WI 1 29,000 3,850 755 4 330,000 $ 29,545 $ 6,991 (1) Gross sales price is the gross contract price, excluding closing costs. (2) The sale of this property was completed in January 2022. (3) The sale of these properties was completed in February 2022. As of February 15, 2022, we have entered into an agreement to sell one property that was classified as held for sale as of December 31, 2021 containing approximately 29,000 rentable square feet for a sales price of $3,850, excluding closing costs. This pending sale is subject to conditions, accordingly, we cannot be sure that we will complete this sale or that this sale will not be delayed or the terms will not change. We also recorded a $10,658 loss on impairment of real estate to reduce the carrying value of three properties that were classified as held for sale to their estimated fair values less costs to sell as of September 30, 2021. Subsequently, we removed these properties from held for sale status due to a change of plan for sale and recorded an impairment adjustment of $425 to increase the carrying value of these properties to their estimated fair value as of December 31, 2021. In November 2021, the buyer terminated the previously disclosed agreement to sell five properties located in Brookhaven, GA for a sales price of $56,000. 2020 Disposition Activities During the year ended December 31, 2020, we sold 10 properties containing approximately 906,000 rentable square feet for an aggregate sales price of $110,463, excluding closing costs and including the repayment of one mortgage note with an outstanding principal balance of $13,095, an annual interest rate of 5.9% and a maturity date in August 2021. Date of Sale Number of Properties Location Rentable Square Feet Gross Sales Price (1) Gain (Loss) on Sale of Real Estate Loss on Impairment of Real Estate January 2020 2 Stafford, VA 65,000 $ 14,063 $ 4,771 $ — January 2020 1 Windsor, CT 97,000 7,000 314 — February 2020 1 Lincolnshire, IL 223,000 12,000 1,179 — March 2020 1 Trenton, NJ (2) 267,000 30,100 (179) — March 2020 1 Fairfax, VA 83,000 22,200 4,754 — October 2020 4 Fairfax, VA 171,000 25,100 16 2,954 10 906,000 $ 110,463 $ 10,855 $ 2,954 (1) Gross sales price is the gross contract price, excluding closing costs. (2) We recorded a $9,454 loss on impairment of real estate during the year ended December 31, 2019 to adjust the carrying value of this property to its fair value less costs to sell. 2019 Disposition Activities During the year ended December 31, 2019, we sold 58 properties containing approximately 6,179,000 rentable square feet for an aggregate sales price of $848,853, excluding closing costs. Date of Sale Number of Properties Location Rentable Square Feet Gross Sales Price (1) Gain (Loss) on Sale of Real Estate Loss on Impairment of Real Estate February 2019 34 Northern Virginia and Maryland 1,636,000 $ 198,500 $ — $ 732 March 2019 1 Washington, D.C. (2) 129,000 70,000 22,075 — May 2019 1 Buffalo, NY 122,000 16,900 — 5,137 May 2019 1 Maynard, MA 287,000 5,000 (227) — June 2019 1 Kapolei, HI 417,000 7,100 — — July 2019 1 San Jose, CA 72,000 14,000 (270) — July 2019 1 Nashua, NH 322,000 25,000 8,401 — August 2019 1 Arlington, TX 182,000 14,900 187 — August 2019 1 Rochester, NY 95,000 4,765 (104) — August 2019 1 Hanover, PA 502,000 5,500 (417) — August 2019 1 San Antonio, TX 618,000 198,000 3,869 — September 2019 1 Topeka, KS 144,000 15,600 36 — September 2019 1 Falling Waters, WV 40,000 650 — 2,179 September 2019 1 San Diego, CA 44,000 8,950 3,062 — October 2019 3 Columbia, SC 181,000 10,750 — 3,581 November 2019 3 Metro DC - MD 373,000 61,938 1,177 — December 2019 1 San Diego, CA 148,000 23,750 6,823 — December 2019 1 Phoenix, AZ 123,000 12,850 860 — December 2019 1 Houston, TX 497,000 130,000 59,992 — December 2019 1 Kansas City, KS 171,000 11,700 — 1,172 December 2019 1 San Jose, CA 76,000 13,000 (333) — 58 6,179,000 $ 848,853 $ 105,131 $ 12,801 (1) Gross sales price is the gross contract price, excluding closing costs. (2) Represents an individually significant disposition. Unconsolidated Joint Ventures We own interests in two joint ventures that own three properties. We account for these investments under the equity method of accounting. As of December 31, 2021 and 2020, our investments in unconsolidated joint ventures consisted of the following: OPI Ownership OPI Carrying Value of Investments at December 31, Number of Properties Location Rentable Square Feet Joint Venture 2021 2020 Prosperity Metro Plaza 51% $ 20,672 $ 21,888 2 Fairfax, VA 329,000 1750 H Street, NW 50% 14,166 16,063 1 Washington, D.C. 115,000 Total $ 34,838 $ 37,951 3 444,000 The following table provides a summary of the mortgage debt of our two unconsolidated joint ventures: Joint Venture Interest Rate (1) Maturity Date Principal Balance at December 31, 2021 and 2020 (2) Prosperity Metro Plaza 4.09% 12/1/2029 $ 50,000 1750 H Street, NW 3.69% 8/1/2024 32,000 Weighted Average/Total 3.93% $ 82,000 (1) Includes the effect of mark to market purchase accounting. (2) Reflects the entire balance of the debt secured by the properties and is not adjusted to reflect the interests in the joint ventures we do not own. None of the debt is recourse to us. At December 31, 2021, the aggregate unamortized basis difference of our two unconsolidated joint ventures of $6,977 is primarily attributable to the difference between the amount we paid to purchase our interest in these joint ventures, including transaction costs, and the historical carrying value of the net assets of these joint ventures. This difference is being amortized over the remaining useful life of the related properties and the resulting amortization expense is included in equity in net losses of investees in our consolidated statements of comprehensive income (loss).

Leases

Leases	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Leases	Leases Rental income from operating leases, including payments derived by index or market-based indices, is recognized on a straight line basis over the lease term when we have determined that the collectability of substantially all of the lease payments is probable. We increased rental income by $15,368, $16,079 and $27,507 to record revenue on a straight line basis during the years ended December 31, 2021, 2020 and 2019, respectively. Rents receivable, excluding properties classified as held for sale, include $82,978 and $68,824 of straight line rent receivables at December 31, 2021 and 2020, respectively. We do not include in our measurement of our lease receivables certain variable payments, including payments determined by changes in the index or market-based indices after the inception of the lease, certain tenant reimbursements and other income until the specific events that trigger the variable payments have occurred. Such payments totaled $85,107, $75,851 and $91,076 for the years ended December 31, 2021, 2020 and 2019, respectively, of which tenant reimbursements totaled $81,295, $71,385 and $86,353, respectively. The following operating lease maturity analysis presents the future contractual lease payments to be received by us through 2053 as of December 31, 2021: Year Amount 2022 $ 456,350 2023 422,139 2024 360,282 2025 296,945 2026 253,313 Thereafter 1,267,710 Total $ 3,056,739 In certain circumstances, some leases provide the tenant with the right to terminate if the legislature or other funding authority does not appropriate the funding necessary for the tenant to meet its lease obligations; we have determined the fixed non-cancelable lease term of these leases to be the full term of the lease because we believe the occurrence of early terminations to be a remote contingency based on both our historical experience and our assessments of the likelihood of lease cancellation on a separate lease basis. As of December 31, 2021, tenants who currently represent approximately 2.8% of our total operating lease maturities have currently exercisable rights to terminate their leases before the stated terms of their leases expire. In 2022, 2023, 2024, 2025, 2026, 2027, 2028, 2029, 2030, 2035 and 2040, early termination rights become exercisable by other tenants who currently represent an additional approximately 1.5%, 8.8%, 3.0%, 6.2%, 2.4%, 1.7%, 2.5%, 1.7%, 1.6%, 1.7% and 1.1% of our total operating lease maturities, respectively. In addition, as of December 31, 2021, 14 of our tenants have the right to terminate their leases if the respective legislature or other funding authority does not appropriate the funding necessary for the tenant to meet its obligation. These 14 tenants represent approximately 6.2% of our total operating lease maturities as of December 31, 2021. As a result of the COVID-19 pandemic, we granted temporary rent assistance totaling $2,483 to 18 tenants. This assistance generally entailed a deferral of, in most cases, one month of rent pursuant to deferred payment plans which required the deferred rent amounts be payable over a 12-month period. We elected to use the FASB relief package that provides entities with the option to account for lease concessions resulting from the COVID-19 pandemic outside of the existing lease modification guidance if the resulting cash flows from the modified lease are substantially the same as or less than the original lease. Because the deferred rent amounts were to be repaid, the cash flows from the respective leases are substantially the same as before the rent deferrals. The deferred amounts did not impact our operating results for the years ended December 31, 2021 and 2020. As of December 31, 2021, we had collected 100% of the granted rent deferrals. Right of use asset and lease liability. For leases where we are the lessee, we are required to record a right of use asset and lease liability for all leases with an initial term greater than 12 months. As of December 31, 2020, we had one lease that met these criteria, which expired on January 31, 2021. We subleased a portion of the space, which sublease also expired on January 31, 2021. The value of the right of use asset and related liability representing our future obligation under the lease arrangement as of December 31, 2020 were $168 and $174, respectively, and are included in other assets, net accounts payable and other liabilities
Leases	Leases Rental income from operating leases, including payments derived by index or market-based indices, is recognized on a straight line basis over the lease term when we have determined that the collectability of substantially all of the lease payments is probable. We increased rental income by $15,368, $16,079 and $27,507 to record revenue on a straight line basis during the years ended December 31, 2021, 2020 and 2019, respectively. Rents receivable, excluding properties classified as held for sale, include $82,978 and $68,824 of straight line rent receivables at December 31, 2021 and 2020, respectively. We do not include in our measurement of our lease receivables certain variable payments, including payments determined by changes in the index or market-based indices after the inception of the lease, certain tenant reimbursements and other income until the specific events that trigger the variable payments have occurred. Such payments totaled $85,107, $75,851 and $91,076 for the years ended December 31, 2021, 2020 and 2019, respectively, of which tenant reimbursements totaled $81,295, $71,385 and $86,353, respectively. The following operating lease maturity analysis presents the future contractual lease payments to be received by us through 2053 as of December 31, 2021: Year Amount 2022 $ 456,350 2023 422,139 2024 360,282 2025 296,945 2026 253,313 Thereafter 1,267,710 Total $ 3,056,739 In certain circumstances, some leases provide the tenant with the right to terminate if the legislature or other funding authority does not appropriate the funding necessary for the tenant to meet its lease obligations; we have determined the fixed non-cancelable lease term of these leases to be the full term of the lease because we believe the occurrence of early terminations to be a remote contingency based on both our historical experience and our assessments of the likelihood of lease cancellation on a separate lease basis. As of December 31, 2021, tenants who currently represent approximately 2.8% of our total operating lease maturities have currently exercisable rights to terminate their leases before the stated terms of their leases expire. In 2022, 2023, 2024, 2025, 2026, 2027, 2028, 2029, 2030, 2035 and 2040, early termination rights become exercisable by other tenants who currently represent an additional approximately 1.5%, 8.8%, 3.0%, 6.2%, 2.4%, 1.7%, 2.5%, 1.7%, 1.6%, 1.7% and 1.1% of our total operating lease maturities, respectively. In addition, as of December 31, 2021, 14 of our tenants have the right to terminate their leases if the respective legislature or other funding authority does not appropriate the funding necessary for the tenant to meet its obligation. These 14 tenants represent approximately 6.2% of our total operating lease maturities as of December 31, 2021. As a result of the COVID-19 pandemic, we granted temporary rent assistance totaling $2,483 to 18 tenants. This assistance generally entailed a deferral of, in most cases, one month of rent pursuant to deferred payment plans which required the deferred rent amounts be payable over a 12-month period. We elected to use the FASB relief package that provides entities with the option to account for lease concessions resulting from the COVID-19 pandemic outside of the existing lease modification guidance if the resulting cash flows from the modified lease are substantially the same as or less than the original lease. Because the deferred rent amounts were to be repaid, the cash flows from the respective leases are substantially the same as before the rent deferrals. The deferred amounts did not impact our operating results for the years ended December 31, 2021 and 2020. As of December 31, 2021, we had collected 100% of the granted rent deferrals. Right of use asset and lease liability. For leases where we are the lessee, we are required to record a right of use asset and lease liability for all leases with an initial term greater than 12 months. As of December 31, 2020, we had one lease that met these criteria, which expired on January 31, 2021. We subleased a portion of the space, which sublease also expired on January 31, 2021. The value of the right of use asset and related liability representing our future obligation under the lease arrangement as of December 31, 2020 were $168 and $174, respectively, and are included in other assets, net accounts payable and other liabilities

Business and Property Managemen

Business and Property Management Agreements with RMR LLC	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Business and Property Management Agreements with RMR LLC	Business and Property Management Agreements with RMR LLC We have no employees. The personnel and various services we require to operate our business are provided to us by The RMR Group LLC, or RMR LLC. We have two agreements with RMR LLC to provide management services to us: (1) a business management agreement, which relates to our business generally; and (2) a property management agreement, which relates to our property level operations. Management Agreements with RMR LLC . Our management agreements with RMR LLC provide for an annual base management fee, an annual incentive management fee and property management and construction supervision fees, payable in cash, among other terms: • Base Management Fee. The annual base management fee payable to RMR LLC by us for each applicable period is equal to the lesser of: • the sum of (a) 0.5% of the average aggregate historical cost of the real estate assets acquired from a REIT to which RMR LLC provided business management or property management services, or the Transferred Assets, plus (b) 0.7% of the average aggregate historical cost of our real estate investments excluding the Transferred Assets up to $250,000, plus (c) 0.5% of the average aggregate historical cost of our real estate investments excluding the Transferred Assets exceeding $250,000; and • the sum of (a) 0.7% of the average closing price per share of our common shares on the stock exchange on which such shares are principally traded during such period, multiplied by the average number of our common shares outstanding during such period, plus the daily weighted average of the aggregate liquidation preference of each class of our preferred shares outstanding during such period, plus the daily weighted average of the aggregate principal amount of our consolidated indebtedness during such period, or, together, our Average Market Capitalization, up to $250,000, plus (b) 0.5% of our Average Market Capitalization exceeding $250,000. The average aggregate historical cost of our real estate investments includes our consolidated assets invested, directly or indirectly, in equity interests in or loans secured by real estate and personal property owned in connection with such real estate (including acquisition related costs and costs which may be allocated to intangibles or are unallocated), all before reserves for depreciation, amortization, impairment charges or bad debts or other similar non-cash reserves. • Incentive Management Fee . The incentive management fee which may be earned by RMR LLC for an annual period is calculated as follows: • An amount, subject to a cap based on the value of our common shares outstanding, equal to 12% of the product of: • our equity market capitalization on the last trading day of the year immediately prior to the relevant three • the amount (expressed as a percentage) by which the total return per share, as defined in the business management agreement and further described below, of our common shareholders (i.e., share price appreciation plus dividends) exceeds the total shareholder return of the applicable index, or the benchmark return per share, for the relevant measurement period. Effective as of August 1, 2021, we amended our business management agreement with RMR LLC to replace the benchmark index used in the calculation of incentive management fees. Pursuant to this amendment, for periods beginning on and after August 1, 2021, the MSCI U.S. REIT/Office REIT Index replaced the discontinued SNL U.S. REIT Office Index and will be used to calculate benchmark returns per share for purposes of determining any incentive management fee payable by us to RMR LLC. For periods prior to August 1, 2021, the SNL U.S. REIT Office Index will continue to be used. Accordingly, the calculation of incentive management fees for the next two measurement periods will continue to use the SNL U.S. REIT Office Index in calculating the benchmark returns for periods through July 31, 2021. This change of index was due to S&P Global ceasing to publish the SNL U.S. REIT Office Index. For purposes of the total return per share of our common shareholders, share price appreciation for a measurement period is determined by subtracting (1) the closing price of our common shares on The Nasdaq Stock Market LLC, or Nasdaq, on the last trading day of the year immediately before the first year of the applicable measurement period, or the initial share price, from (2) the average closing price of our common shares on the 10 consecutive trading days having the highest average closing prices during the final 30 trading days in the last year of the measurement period. • The calculation of the incentive management fee (including the determinations of our equity market capitalization, initial share price and the total return per share of our common shareholders) is subject to adjustments if we issue or repurchase our common shares, or if our common shares are forfeited, during the measurement period. • No incentive management fee is payable by us unless our total return per share during the measurement period is positive. • The measurement periods are three • If our total return per share exceeds 12% per year in any measurement period, the benchmark return per share is adjusted to be the lesser of the total shareholder return of the applicable index for such measurement period and 12% per year, or the adjusted benchmark return per share. In instances where the adjusted benchmark return per share applies, the incentive management fee will be reduced if our total return per share is between 200 basis points and 500 basis points below the applicable index in any year by a low return factor, as defined in the business management agreement, and there will be no incentive management fee paid if, in these instances, our total return per share is more than 500 basis points below the applicable index in any year, determined on a cumulative basis (i.e., between 200 basis points and 500 basis points per year multiplied by the number of years in the measurement period and below the applicable market index). • The incentive management fee is subject to a cap. The cap is equal to the value of the number of our common shares which would, after issuance, represent 1.5% of the number of our common shares then outstanding multiplied by the average closing price of our common shares during the 10 consecutive trading days having the highest average closing prices during the final 30 trading days of the relevant measurement period. • Incentive management fees we paid to RMR LLC for any period may be subject to “clawback” if our financial statements for that period are restated due to material non-compliance with any financial reporting requirements under the securities laws as a result of the bad faith, fraud, willful misconduct or gross negligence of RMR LLC and the amount of the incentive management fee we paid was greater than the amount we would have paid based on the restated financial statements. Pursuant to our business management agreement with RMR LLC, we recognized net business management fees of $18,637, $17,358 and $21,320 for the years ended December 31, 2021, 2020 and 2019, respectively. The net business management fees we recognized are included in general and administrative expenses in our consolidated statements of comprehensive income (loss) for these periods. The net business management fees we recognized for each of the years ended December 31, 2021, 2020 and 2019 reflect a reduction of $603, for the amortization of the liability we recorded in connection with our former investment in RMR Inc., as further described in Note 2. We did not incur any incentive management fee pursuant to our business management agreement for the years ended December 31, 2021, 2020 or 2019. In January 2019, we paid RMR LLC a business management incentive fee of $25,817, which represented the incentive fee for the year ended December 31, 2018 incurred, but not paid, by Select Income REIT, or SIR, which we acquired in 2018. • Property Management and Construction Supervision Fees . The property management fees payable to RMR LLC by us for each applicable period are equal to 3.0% of gross collected rents and the construction supervision fees payable to RMR LLC by us for each applicable period are equal to 5.0% of construction costs. Pursuant to our property management agreement with RMR LLC, we recognized aggregate net property management and construction supervision fees of $21,103, $20,774 and $21,911 for each of the years ended December 31, 2021, 2020 and 2019, respectively. The net property management and construction supervision fees we recognized for the years ended December 31, 2021, 2020 and 2019 reflect a reduction of $484 for each of those years for the amortization of the liability we recorded in connection with our former investment in RMR Inc., as further described in Note 2. For the years ended December 31, 2021, 2020 and 2019, $16,507, $17,328, and $19,320, respectively, of the total net property management and construction supervision fees were expensed to other operating expenses in our consolidated statements of income (loss) and $4,596, $3,446, and $2,591, respectively, were capitalized as building improvements in our consolidated balance sheets. The amounts capitalized are being depreciated over the estimated useful lives of the related capital assets. • Expense Reimbursement . We are generally responsible for all of our operating expenses, including certain expenses incurred or arranged by RMR LLC on our behalf. We are generally not responsible for payment of RMR LLC’s employment, office or administrative expenses incurred to provide management services to us, except for the employment and related expenses of RMR LLC’s employees assigned to work exclusively or partly at our properties, our share of the wages, benefits and other related costs of RMR LLC’s centralized accounting personnel, our share of RMR LLC’s costs for providing our internal audit function and as otherwise agreed. Our Audit Committee appoints our Director of Internal Audit and our Compensation Committee approves the costs of our internal audit function. Our property level operating expenses are generally incorporated into rents charged to our tenants, including certain payroll and related costs incurred by RMR LLC. We reimbursed RMR LLC $24,766, $24,919 and $26,442 for these expenses and costs for each of the years ended December 31, 2021, 2020 and 2019, respectively. We included these amounts in other operating expenses and general and administrative expense, as applicable, for these periods. • Term . Our management agreements with RMR LLC have terms that end on December 31, 2041, and automatically extend on December 31st of each year for an additional year, so that the terms of our management agreements thereafter end on the 20th anniversary of the date of the extension. • Termination Rights . We have the right to terminate one or both of our management agreements with RMR LLC: (i) at any time on 60 days’ written notice for convenience, (ii) immediately on written notice for cause, as defined therein, (iii) on written notice given within 60 days after the end of an applicable calendar year for a performance reason, as defined therein, and (iv) by written notice during the 12 months following a change of control of RMR LLC, as defined therein. RMR LLC has the right to terminate the management agreements for good reason, as defined therein. • Termination Fee . If we terminate one or both of our management agreements with RMR LLC for convenience, or if RMR LLC terminates one or both of our management agreements for good reason, we have agreed to pay RMR LLC a termination fee in an amount equal to the sum of the present values of the monthly future fees, as defined therein, for the terminated management agreement(s) for the term that was remaining prior to such termination, which, depending on the time of termination, would be between 19 and 20 years. If we terminate one or both of our management agreements with RMR LLC for a performance reason, we have agreed to pay RMR LLC the termination fee calculated as described above, but assuming a 10-year term was remaining prior to the termination. We are not required to pay any termination fee if we terminate our management agreements with RMR LLC for cause or as a result of a change of control of RMR LLC. • Transition Services . RMR LLC has agreed to provide certain transition services to us for 120 days following an applicable termination by us or notice of termination by RMR LLC, including cooperating with us and using commercially reasonable efforts to facilitate the orderly transfer of the management and real estate investment services provided under our business management agreement and to facilitate the orderly transfer of the management of the managed properties under our property management agreement, as applicable. • Vendors . Pursuant to our management agreements with RMR LLC, RMR LLC may from time to time negotiate on our behalf with certain third party vendors and suppliers for the procurement of goods and services to us. As part of this arrangement, we may enter agreements with RMR LLC and other companies to which RMR LLC or its subsidiaries provide management services for the purpose of obtaining more favorable terms from such vendors and suppliers. • Investment Opportunities . Under our business management agreement with RMR LLC, we acknowledge that RMR LLC may engage in other activities or businesses and act as the manager to any other person or entity (including other REITs) even though such person or entity has investment policies and objectives similar to ours and we are not entitled to preferential treatment in receiving information, recommendations and other services from RMR LLC.

Related Person Transactions

Related Person Transactions	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Person Transactions	Related Person Transactions We have relationships and historical and continuing transactions with RMR LLC, RMR Inc., and others related to them, including other companies to which RMR LLC or its subsidiaries provide management services and some of which have trustees, directors or officers who are also our Trustees or officers. RMR LLC is a majority owned subsidiary of RMR Inc. The Chair of our Board of Trustees and one of our Managing Trustees, Adam Portnoy, is the sole trustee, an officer and the controlling shareholder of ABP Trust, which is the controlling shareholder of RMR Inc., a managing director, the president and chief executive officer of RMR Inc. and an officer and employee of RMR LLC. David Blackman resigned as our President and Chief Executive Officer, effective December 31, 2020, and as a Managing Trustee, effective June 17, 2021. In replacement of Mr. Blackman, Christopher J. Bilotto was appointed as our President and Chief Operating Officer, effective January 1, 2021, and Jennifer Clark was elected as a Managing Trustee, effective on June 17, 2021. Mr. Bilotto is an officer and employee of RMR LLC, Ms. Clark is a managing director and an executive officer of RMR Inc., an officer and employee of RMR LLC and an officer of ABP Trust. In addition, each of our other officers is also an officer and employee of RMR LLC. Some of our Independent Trustees also serve as independent trustees or independent directors of other public companies to which RMR LLC or its subsidiaries provide management services. Mr. Portnoy serves as chair of the board and as a managing director or managing trustee of these public companies. Other officers of RMR LLC, including certain of our officers, serve as managing trustees, managing directors or officers of certain of these companies. Our Manager, RMR LLC . We have two agreements with RMR LLC to provide management services to us. See Note 5 for more information regarding our management agreements with RMR LLC. Leases with RMR LLC . We lease office space to RMR LLC in certain of our properties for RMR LLC’s property management offices. Pursuant to our lease agreements with RMR LLC, we recognized rental income from RMR LLC for leased office space of $1,138, $1,120 and $1,142 for the years ended December 31, 2021, 2020 and 2019, respectively. Our office space leases with RMR LLC are terminable by RMR LLC if our management agreements with RMR LLC are terminated. Share Awards to RMR LLC Employees . As described further in Note 10, we award shares to our officers and other employees of RMR LLC annually. Generally, one fifth of these awards vest on the grant date and one fifth vests on each of the next four Sonesta . In June 2021, we entered into a 30-year lease agreement with a subsidiary of Sonesta International Hotels Corporation, or Sonesta, in connection with the redevelopment of an office property we own in Washington, D.C. as a mixed-use property. Sonesta’s lease is for the planned full-service hotel component of the property that will include approximately 230,000 rentable square feet, which represents approximately 54% of the total square feet upon completion of the redevelopment. The term of the lease commences upon our delivery of the completed hotel, which we estimate to occur in the first quarter of 2023. Sonesta has two options to extend the term for 10 years each. Pursuant to the lease agreement, Sonesta will pay us annual base rent of approximately $6,436 beginning 18 months after the lease commences. The annual base rent will increase by 10% every five years throughout the term. Sonesta is also obligated to pay its pro rata share of the operating costs for the property. We estimate that the total cost to build the hotel space will be approximately $66,000. Mr. Adam Portnoy is a director and controlling shareholder of Sonesta and Ms. Jennifer Clark is also a director of Sonesta. RMR Inc. On July 1, 2019, we sold all of the 2,801,060 shares of class A common stock of RMR Inc. that we owned in an underwritten public offering at a price to the public of $40.00 per share pursuant to an underwriting agreement among us, RMR Inc., certain other REITs managed by RMR LLC that also sold their class A common stock of RMR Inc. in the offering and the underwriters named therein. We received net proceeds of $104,674 from this sale, after deducting underwriting discounts and commissions and other offering expenses. AIC . Until its dissolution on February 13, 2020, we, ABP Trust and five other companies to which RMR LLC provides management services owned AIC in equal portions. We and the other AIC shareholders historically participated in a combined property insurance program arranged and insured or reinsured in part by AIC until June 30, 2019. We paid aggregate annual premiums, including taxes and fees, of $1,211 in connection with this insurance program for the policy year ended June 30, 2019. Properties we acquired as a result of our acquisition of SIR on December 31, 2018 were already previously included in this insurance program because SIR was a participant in the program. SIR paid an annual premium, including taxes and fees, of $1,666 in connection with this insurance program for the policy year ended June 30, 2019. In connection with AIC’s dissolution, we and each other AIC shareholder received an initial liquidating distribution of $9,000 from AIC in December 2019, an additional liquidating distribution of $287 in June 2020 and a final liquidating distribution of $11 in December 2021. As of December 31, 2020, our investment in AIC had a carrying value of $11, which was included in other assets in our consolidated balance sheet. We recognized income of $281 related to our investment in AIC for the year ended December 31, 2019. This amount is included in equity in net losses of investees in our consolidated statements of comprehensive income (loss). Our other comprehensive income (loss) includes our proportionate part of unrealized gains (losses) on securities which were owned and held for sale by AIC of $90 related to our investment in AIC for the year ended December 31, 2019.

Concentration

Concentration	12 Months Ended
	Dec. 31, 2021
Risks and Uncertainties [Abstract]
Concentration	Concentration Tenant and Credit Concentration We define annualized rental income as the annualized contractual base rents from our tenants pursuant to our lease agreements as of the measurement date, plus straight line rent adjustments and estimated recurring expense reimbursements to be paid to us, and excluding lease value amortization. As of December 31, 2021, the U.S. government, 11 state governments and four other government tenants combined were responsible for approximately 28.9% of our annualized rental income. As of December 31, 2020 and 2019, the U.S government, 11 state governments and two other government tenants combined were responsible for approximately 35.3% and 35.5% of our annualized rental income, respectively. The U.S. government is our largest tenant by annualized rental income and represented approximately 19.5%, 25.2% and 25.0% of our annualized rental income as of December 31, 2021, 2020 and 2019, respectively. Geographic Concentration At December 31, 2021, our 178 wholly owned properties were located in 33 states and the District of Columbia. Properties located in Virginia, California, the District of Columbia, Illinois and Georgia were responsible for approximately 12.4%, 10.5%, 9.8%, 9.2%, and 8.2% of our annualized rental income as of December 31, 2021, respectively.

Indebtedness

Indebtedness	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Indebtedness	Indebtedness At December 31, 2021 and 2020, our outstanding indebtedness consisted of the following: December 31, 2021 2020 Revolving credit facility, due in 2023 $ — $ — Senior unsecured notes, 4.15% interest rate, due in 2022 (1) — 300,000 Senior unsecured notes, 4.00% interest rate, due in 2022 300,000 300,000 Senior unsecured notes, 4.25% interest rate, due in 2024 350,000 350,000 Senior unsecured notes, 4.50% interest rate, due in 2025 650,000 650,000 Senior unsecured notes, 2.650% interest rate, due in 2026 (2) 300,000 — Senior unsecured notes, 2.400% interest rate, due in 2027 (3) 350,000 — Senior unsecured notes, 3.450% interest rate, due in 2031 (4) 400,000 — Senior unsecured notes, 5.875% interest rate, due in 2046 (5) — 310,000 Senior unsecured notes, 6.375% interest rate, due in 2050 162,000 162,000 Mortgage note payable, 8.150% interest rate, due in 2021 (6) — 350 Mortgage note payable, 4.220% interest rate, due in 2022 (7) 25,055 25,804 Mortgage note payable, 3.550% interest rate, due in 2023 (8) — 71,000 Mortgage note payable, 3.700% interest rate, due in 2023 50,000 50,000 Mortgage note payable, 4.800% interest rate, due in 2023 23,246 23,688 2,610,301 2,242,842 Unamortized debt premiums, discounts and issuance costs (32,351) (39,871) $ 2,577,950 $ 2,202,971 (1) These senior notes were redeemed in September 2021. (2) These senior notes were issued in May 2021. (3) These senior notes were issued in August 2021. (4) These senior notes were issued in September 2021. (5) These senior notes were redeemed in June 2021. (6) This mortgage note was paid in full as of its maturity date. (7) In February 2022, we gave notice of our intention to prepay this mortgage note at par plus accrued interest. We expect to make this prepayment in April 2022. (8) This mortgage note was prepaid in June 2021. Our $750,000 revolving credit facility is governed by a credit agreement, or our credit agreement, with a syndicate of institutional lenders that includes a feature under which the maximum aggregate borrowing availability may be increased to up to $1,950,000 in certain circumstances. Our $750,000 revolving credit facility is available for general business purposes, including acquisitions. The maturity date of our revolving credit facility is January 31, 2023 and, subject to our payment of an extension fee and meeting certain other conditions, we have the option to extend the stated maturity date of our revolving credit facility by two additional six Our credit agreement and senior unsecured notes indentures and their supplements provide for acceleration of payment of all amounts due thereunder upon the occurrence and continuation of certain events of default, such as, in the case of our credit agreement, a change of control of us, which includes RMR LLC ceasing to act as our business and property manager. Our credit agreement and senior unsecured notes indentures and their supplements also contain covenants, including covenants that restrict our ability to incur debts, require us to comply with certain financial covenants and, in the case of our credit agreement, restrict our ability to make distributions under certain circumstances. We believe we were in compliance with the terms and conditions of the respective covenants under our credit agreement and senior unsecured notes indentures and their supplements at December 31, 2021. Senior Unsecured Note Issuances In May 2021, we issued $300,000 of 2.650% senior unsecured notes due 2026 in an underwritten public offering, raising net proceeds of $296,826, after deducting underwriters’ discounts and offering expenses. These notes require semi-annual payments of interest only through maturity on June 15, 2026 and may be repaid at par plus accrued and unpaid interest on or after May 15, 2026. In August 2021, we issued $350,000 of 2.400% senior unsecured notes due 2027 in an underwritten public offering, raising net proceeds of $346,607, after deducting underwriters’ discounts and offering expenses. These notes require semi-annual payments of interest only through maturity on February 1, 2027 and may be repaid at par plus accrued and unpaid interest on or after January 1, 2027. In September 2021, we issued $400,000 of 3.450% senior unsecured notes due 2031 in an underwritten public offering, raising net proceeds of $395,632, after deducting underwriters’ discounts and offering expenses. These notes require semi-annual payments of interest only through maturity on October 15, 2031 and may be repaid at par plus accrued and unpaid interest on or after July 15, 2031. Senior Unsecured Note Redemptions In June 2021, we redeemed, at par plus accrued interest, all $310,000 of our 5.875% senior unsecured notes due 2046. As a result of this redemption, we recognized a loss on early extinguishment of debt of $8,581 during the year ended December 31, 2021, from the write off of unamortized debt issuance costs. In September 2021, we redeemed, at a premium plus accrued interest, all $300,000 of our 4.15% senior unsecured notes due 2022. As a result of this redemption, we recognized a loss on early extinguishment of debt of $2,274 during the year ended December 31, 2021, from a prepayment penalty and the write off of unamortized discounts. Mortgage Note Repayment In June 2021, we prepaid, at a premium plus accrued interest, a mortgage note secured by three properties with an outstanding principal balance of $71,000, an annual interest rate of 3.55% and a maturity date in May 2023. As a result of the prepayment of this mortgage note, we recognized a loss on early extinguishment of debt of $3,213 during the year ended December 31, 2021, from a prepayment penalty and the write off of unamortized discounts. At December 31, 2021, three of our properties with an aggregate net book value of $188,130 were encumbered by mortgage notes with an aggregate principal amount of $98,301. Our mortgage notes are non-recourse, subject to certain limited exceptions and do not contain any material financial covenants. None of our unsecured debt obligations require sinking fund payments prior to their maturity dates. The required principal payments due during the next five years and thereafter under all our outstanding consolidated debt as of December 31, 2021 are as follows: Year Principal Payment 2022 (1) $ 325,517 2023 72,784 2024 350,000 2025 650,000 2026 300,000 Thereafter 912,000 Total $ 2,610,301 (2) (1) In February 2022, we gave notice of our intention to prepay, at par plus accrued interest, a mortgage note secured by one property with an outstanding principal balance of $25,055 at December 31, 2021, an annual interest rate of 4.22% and a maturity date in July 2022. (2) Total consolidated debt outstanding as of December 31, 2021, net of unamortized premiums, discounts and issuance costs totaling $32,351, was $2,577,950.

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities The following table presents certain of our assets measured at fair value at December 31, 2021, categorized by the level of inputs, as defined in the fair value hierarchy under GAAP, used in the valuation of each asset: Fair Value at Reporting Date Using Description Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Non-recurring Fair Value Measurements Assets Assets of properties held for sale (1) $ 10,600 $ — $ 10,600 $ — (1) We recorded impairment charges of $6,991 to reduce the carrying value of two properties that are classified as held for sale in our consolidated balance sheet to their estimated fair value, less estimated costs to sell of $555, based on negotiated sales prices with third party buyers (Level 2 inputs as defined in the fair value hierarchy under GAAP). See Note 3 for more information. In addition to the assets described in the table above, our financial instruments include our cash and cash equivalents, restricted cash, rents receivable, accounts payable, a revolving credit facility, senior unsecured notes, mortgage notes payable, amounts due to related persons, other accrued expenses and security deposits. At December 31, 2021 and 2020, the fair values of our financial instruments approximated their carrying values in our consolidated financial statements, due to their short term nature or floating interest rates, except as follows: As of December 31, 2021 As of December 31, 2020 Financial Instrument Carrying Value (1) Fair Value Carrying Value (1) Fair Value Senior unsecured notes, 4.15% interest rate, due in 2022 (2) $ — $ — $ 298,853 $ 306,192 Senior unsecured notes, 4.00% interest rate, due in 2022 299,500 304,148 298,579 306,756 Senior unsecured notes, 4.25% interest rate, due in 2024 344,581 365,449 342,299 365,435 Senior unsecured notes, 4.50% interest rate, due in 2025 639,370 687,749 635,921 688,399 Senior unsecured notes, 2.650% interest rate, due in 2026 (3) 297,213 298,502 — — Senior unsecured notes, 2.400% interest rate, due in 2027 (4) 346,845 339,764 — — Senior unsecured notes, 3.450% interest rate, due in 2031 (5) 395,744 388,458 — — Senior unsecured notes, 5.875% interest rate, due in 2046 (6) — — 301,264 322,028 Senior unsecured notes, 6.375% interest rate, due in 2050 156,519 177,098 156,326 171,590 Mortgage notes payable 98,178 100,294 169,729 174,952 Total $ 2,577,950 $ 2,661,462 $ 2,202,971 $ 2,335,352 (1) Includes unamortized debt premiums, discounts and issuance costs totaling $32,351 and $39,871 as of December 31, 2021 and 2020, respectively. (2) These senior notes were redeemed in September 2021. (3) These senior notes were issued in May 2021. (4) These senior notes were issued in August 2021. (5) These senior notes were issued in September 2021. (6) These senior notes were redeemed in June 2021. We estimated the fair values of our senior unsecured notes (except for our senior unsecured notes due 2046 and 2050) using an average of the bid and ask price of the notes (Level 2 inputs as defined in the fair value hierarchy under GAAP) as of the measurement date. We estimated the fair values of our senior unsecured notes due 2046 and 2050 based on the closing price on Nasdaq (Level 1 inputs as defined in the fair value hierarchy under GAAP) as of the measurement date. We estimated the fair values of our mortgage notes payable using discounted cash flow analyses and currently prevailing market rates (Level 3 inputs as defined in the fair value hierarchy under GAAP) as of the measurement date. Because Level 3 inputs are unobservable, our estimated fair values may differ materially from the actual fair values.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity Share Awards We have common shares available for issuance under the terms of our Amended and Restated 2009 Incentive Share Award Plan, or the 2009 Plan. During the years ended December 31, 2021, 2020 and 2019, we awarded to our officers and other employees of RMR LLC annual share awards of 117,800, 108,600 and 103,100 of our common shares, respectively, valued at $2,994, $2,502 and $3,080, in aggregate, respectively. We also awarded each of our then eight Trustees 3,500 of our common shares in each of 2021 and 2020, and 3,000 of our common shares in 2019 as part of their annual compensation. These awards had aggregate values of $837 ($105 per Trustee), $745 ($93 per Trustee) and $575 ($72 per Trustee) in 2021, 2020 and 2019, respectively. In addition, we awarded 3,000 of our common shares, with a value of $270 ($90 per Trustee) in connection with the election of three of our Trustees in 2019. The values of the share awards were based upon the closing price of our common shares trading on Nasdaq on the date of grant. The common shares awarded to our Trustees vested immediately. The common shares awarded to our officers and certain other employees of RMR LLC vest in five equal annual installments beginning on the date of award. We recognize share forfeitures as they occur. We include the value of awarded shares in general and administrative expenses ratably over the vesting period. A summary of shares awarded, forfeited, vested and unvested under the terms of the 2009 Plan for the years ended December 31, 2021, 2020 and 2019, is as follows: 2021 2020 2019 Number of Shares Weighted Average Grant Date Fair Value Number of Shares Weighted Average Grant Date Fair Value Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 157,521 $ 29.26 106,680 $ 40.16 55,321 $ 73.25 Awarded 145,800 $ 26.28 136,600 $ 23.77 136,100 $ 28.84 Forfeited (700) $ 25.97 (586) $ 43.75 (1,474) $ 49.10 Vested (120,397) $ 30.24 (85,173) $ 34.02 (83,267) $ 27.78 Unvested at end of year 182,224 $ 26.23 157,521 $ 29.26 106,680 $ 40.16 The 182,224 unvested shares as of December 31, 2021 are scheduled to vest as follows: 60,184 shares in 2022, 56,900 shares in 2023, 41,580 shares in 2024 and 23,560 shares in 2025. As of December 31, 2021, the estimated future compensation expense for the unvested shares was $4,279. The weighted average period over which the compensation expense will be recorded is approximately 23 months. During the years ended December 31, 2021, 2020 and 2019, we recorded $2,868, $3,315 and $3,088, respectively, of compensation expense related to the 2009 Plan. At December 31, 2021, 987,610 of our common shares remained available for issuance under the 2009 Plan. Share Purchases During the years ended December 31, 2021, 2020 and 2019, we purchased 37,801, 19,589 and 15,588 of our common shares, respectively, valued at weighted average share prices of $26.55, $22.15 and $29.76 per common share, respectively, from certain of our current and former Trustees and officers and certain current and former officers and employees of RMR LLC in satisfaction of tax withholding and payment obligations in connection with the vesting of awards of our common shares. Distributions During the years ended December 31, 2021, 2020 and 2019, we paid distributions on our common shares as follows: Annual Per Share Distribution Total Distributions Characterization of Distributions Year Return of Capital Ordinary Income Qualified Dividend 2021 $ 2.20 $ 106,368 —% 100.00% —% 2020 $ 2.20 $ 106,121 —% 100.00% —% 2019 $ 2.20 $ 105,868 —% 100.00% —% On January 13, 2022, we declared a distribution payable to common shareholders of record on January 24, 2022 in the amount of $0.55 per share, or approximately $26,600. We expect to pay this distribution on or about February 17, 2022.

SCHEDULE III REAL ESTATE AND AC

SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION	12 Months Ended
	Dec. 31, 2021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION	Initial Cost to Company Costs Capitalized Subsequent to Acquisition Cost amount carried at Close of Period Property Location Number of Properties Encumbrances (1) Land Buildings Impairments/ Land Buildings Total (2) Accumulated (3) Date(s) Original Inverness Center Birmingham, AL 3 $ — $ 5,907 $ 12,098 $ 1,590 $ (7,717) $ 3,823 $ 8,055 $ 11,878 $ — 12/31/2018 1984 445 Jan Davis Drive Huntsville, AL 1 — 1,501 1,492 — — 1,501 1,492 2,993 (120) 12/31/2018 2007 131 Clayton Street Montgomery, AL 1 — 920 9,084 241 — 920 9,325 10,245 (2,438) 6/22/2011 2007 4344 Carmichael Road Montgomery, AL 1 — 1,374 11,658 562 — 1,374 12,220 13,594 (2,424) 12/17/2013 2009 15451 North 28th Avenue Phoenix, AZ 1 — 1,917 7,416 752 — 1,917 8,168 10,085 (1,518) 9/10/2014 1996 16001 North 28th Avenue Phoenix, AZ 1 — 3,355 412 1,123 — 3,355 1,535 4,890 (145) 12/31/2018 1998 711 S 14th Avenue Safford, AZ 1 — 460 11,708 884 (4,440) 364 8,248 8,612 (1,058) 6/16/2010 1992 Regents Center Tempe, AZ 2 — 4,121 3,042 293 — 4,121 3,335 7,456 (480) 12/31/2018 1988 Campbell Place Carlsbad, CA 2 — 5,769 3,871 7,481 — 5,769 11,352 17,121 (1,476) 12/31/2018 2007 Folsom Corporate Center Folsom, CA 1 — 2,904 5,583 568 — 2,904 6,151 9,055 (585) 12/31/2018 2008 Bayside Technology Park Fremont, CA 1 — 10,784 648 87 — 10,784 735 11,519 (75) 12/31/2018 1990 10949 N. Mather Boulevard Rancho Cordova, CA 1 — 562 16,923 992 — 562 17,915 18,477 (3,658) 10/30/2013 2012 11020 Sun Center Drive Rancho Cordova, CA 1 — 1,466 8,797 1,409 — 1,466 10,206 11,672 (1,486) 12/20/2016 1983 100 Redwood Shores Parkway Redwood City, CA 1 — 14,454 7,721 — — 14,454 7,721 22,175 (643) 12/31/2018 1993 3875 Atherton Road Rocklin, CA 1 — 177 853 9 — 177 862 1,039 (71) 12/31/2018 1991 801 K Street Sacramento, CA 1 — 4,688 61,994 7,078 — 4,688 69,072 73,760 (10,724) 1/29/2016 1989 9815 Goethe Road Sacramento, CA 1 — 1,450 9,465 1,494 — 1,450 10,959 12,409 (2,821) 9/14/2011 1992 Capitol Place Sacramento, CA 1 — 2,290 35,891 8,399 — 2,290 44,290 46,580 (12,964) 12/17/2009 1988 4560 Viewridge Road San Diego, CA 1 — 4,269 18,316 5,135 — 4,347 23,373 27,720 (13,088) 3/31/1997 1996 2115 O’Nel Drive San Jose, CA 1 — 12,305 5,062 218 — 12,305 5,280 17,585 (421) 12/31/2018 1984 North First Street San Jose, CA 1 — 8,311 4,003 411 — 8,311 4,414 12,725 (417) 12/31/2018 1984 Rio Robles Drive San Jose, CA 3 — 23,687 13,698 3,196 — 23,687 16,894 40,581 (1,611) 12/31/2018 1984 2450 and 2500 Walsh Avenue Santa Clara, CA 2 — 13,374 16,651 161 — 13,374 16,812 30,186 (1,401) 12/31/2018 1982 3250 and 3260 Jay Street Santa Clara, CA 2 — 19,899 14,051 — — 19,899 14,051 33,950 (1,168) 12/31/2018 1982 603 San Juan Avenue Stockton, CA 1 — 563 5,470 49 — 563 5,519 6,082 (1,288) 7/20/2012 2012 350 West Java Drive Sunnyvale, CA 1 — 24,609 462 322 — 24,609 784 25,393 (48) 12/31/2018 1984 7958 South Chester Street Centennial, CO 1 — 6,682 7,153 812 — 6,682 7,965 14,647 (651) 12/31/2018 2000 350 Spectrum Loop Colorado Springs, CO 1 — 3,650 7,732 503 — 3,650 8,235 11,885 (665) 12/31/2018 2000 333 Inverness Drive South Englewood, CO 1 — 5,711 4,543 63 — 5,711 4,606 10,317 (408) 12/31/2018 1998 Initial Cost to Company Costs Capitalized Subsequent to Acquisition Cost amount carried at Close of Period Property Location Number of Properties Encumbrances (1) Land Buildings Impairments/ Land Buildings Total (2) Accumulated (3) Date(s) Original 12795 West Alameda Parkway Lakewood, CO 1 — 2,640 23,777 1,441 — 2,640 25,218 27,858 (7,510) 1/15/2010 1988 Corporate Center Lakewood, CO 3 — 2,887 27,537 4,101 — 2,887 31,638 34,525 (15,258) 10/11/2002 1980 11 Dupont Circle, NW Washington, DC 1 — 28,255 44,743 15,108 — 28,255 59,851 88,106 (7,197) 10/2/2017 1974 1211 Connecticut Avenue, NW Washington, DC 1 25,059 30,388 24,667 3,268 — 30,388 27,935 58,323 (3,633) 10/2/2017 1967 1401 K Street, NW Washington, DC 1 23,408 29,215 34,656 6,214 — 29,215 40,870 70,085 (6,005) 10/2/2017 1929 20 Massachusetts Avenue Washington, DC 1 — 12,009 51,527 72,633 — 12,230 123,939 136,169 (40,667) 3/31/1997 1996 440 First Street, NW Washington, DC 1 — 27,903 38,624 2,233 — 27,903 40,857 68,760 (4,520) 10/2/2017 1982 625 Indiana Avenue Washington, DC 1 — 26,000 25,955 9,818 — 26,000 35,773 61,773 (9,746) 8/17/2010 1989 840 First Street, NE Washington, DC 1 — 42,727 73,278 3,546 — 42,727 76,824 119,551 (8,758) 10/2/2017 2003 10350 NW 112th Avenue Miami, FL 1 — 4,798 2,757 1,014 — 4,798 3,771 8,569 (252) 12/31/2018 2002 7850 Southwest 6th Court Plantation, FL 1 — 4,800 30,592 491 — 4,800 31,083 35,883 (8,231) 5/12/2011 1999 8900 Grand Oak Circle Tampa, FL 1 — 1,100 11,773 1,134 — 1,100 12,907 14,007 (3,451) 10/15/2010 1994 180 Ted Turner Drive SW Atlanta, GA 1 — 5,717 20,017 632 — 5,717 20,649 26,366 (4,824) 7/25/2012 2007 1224 Hammond Drive Atlanta, GA 1 — 13,040 135,459 6,549 — 13,040 142,008 155,048 (2,171) 6/25/2021 2020 Corporate Square Atlanta, GA 5 — 3,996 29,762 28,004 — 3,996 57,766 61,762 (18,642) 7/16/2004 1967 Executive Park Atlanta, GA 1 — 1,521 11,826 4,123 — 1,521 15,949 17,470 (7,759) 7/16/2004 1972 One Georgia Center Atlanta, GA 1 — 10,250 27,933 16,756 — 10,250 44,689 54,939 (9,744) 9/30/2011 1968 One Primerica Parkway Duluth, GA 1 — 6,927 22,951 — — 6,927 22,951 29,878 (1,908) 12/31/2018 2013 4712 Southpark Boulevard Ellenwood, GA 1 — 1,390 19,635 118 — 1,390 19,753 21,143 (4,651) 7/25/2012 2005 91-209 Kuhela Street Kapolei, HI 1 — 1,998 — 3 — 1,992 9 2,001 — 12/31/2018 Land 8305 NW 62nd Avenue Johnston, IA 1 — 2,649 7,997 — — 2,649 7,997 10,646 (665) 12/31/2018 2011 1185, 1249 & 1387 S. Vinnell Way Boise, ID 3 — 3,390 29,026 1,016 — 3,390 30,042 33,432 (7,019) 9/11/2012 1996; 1997; 2002 2020 S. Arlington Heights Arlington Heights, IL 1 — 1,450 13,588 1,672 — 1,450 15,260 16,710 (4,204) 12/29/2009 1988 400 South Jefferson Street Chicago, IL 1 49,711 19,379 20,115 779 — 19,379 20,894 40,273 (1,744) 12/31/2018 1947 1000 W. Fulton Chicago, IL 1 — 42,935 258,348 50 — 42,935 258,398 301,333 (4,473) 6/24/2021 2015 HUB 1415 Naperville, IL 1 — 12,333 20,586 12,056 — 12,333 32,642 44,975 (2,681) 12/31/2018 2001 440 North Fairway Drive Vernon Hills, IL 1 — 4,465 441 — — 4,465 441 4,906 (38) 12/31/2018 1992 7601 and 7635 Interactive Way Indianapolis, IN 2 — 3,337 14,522 34 — 3,337 14,556 17,893 (1,136) 12/31/2018 2003 Initial Cost to Company Costs Capitalized Subsequent to Acquisition Cost amount carried at Close of Period Property Location Number of Properties Encumbrances (1) Land Buildings Impairments/ Land Buildings Total (2) Accumulated (3) Date(s) Original Intech Park Indianapolis, IN 3 — 4,170 69,759 9,542 — 4,170 79,301 83,471 (20,726) 10/14/2011 2000; 2001; 2008 The Atrium at Circleport II Erlanger, KY 1 — 1,796 1,933 578 — 1,796 2,511 4,307 (287) 12/31/2018 1999 7125 Industrial Road Florence, KY 1 — 1,698 11,722 293 — 1,698 12,015 13,713 (2,711) 12/31/2012 1980 251 Causeway Street Boston, MA 3 — 26,851 36,756 3,665 — 26,851 40,421 67,272 (6,205) 8/17/2010; 8/3/2021 1987 The Connect Chelmsford, MA 2 — 4,700 — 8,256 — 4,700 8,256 12,956 (496) 12/31/2018 1984 75 Pleasant Street Malden, MA 1 — 1,050 31,086 877 — 1,050 31,963 33,013 (9,349) 5/24/2010 2008 25 Newport Avenue Quincy, MA 1 — 2,700 9,199 1,593 — 2,700 10,792 13,492 (2,823) 2/16/2011 1985 314 Littleton Road Westford, MA 1 — 5,691 8,487 47 — 5,691 8,534 14,225 (717) 12/31/2018 2007 Annapolis Commerce Center Annapolis, MD 2 — 4,057 7,665 4,599 — 4,057 12,264 16,321 (1,121) 10/2/2017 1989 4201 Patterson Avenue Baltimore, MD 1 — 901 8,097 4,134 (85) 893 12,154 13,047 (6,291) 10/15/1998 1989 7001 Columbia Gateway Drive Columbia, MD 1 — 5,642 10,352 399 — 5,642 10,751 16,393 (939) 12/31/2018 2008 Hillside Center Columbia, MD 2 — 3,437 4,228 934 — 3,437 5,162 8,599 (643) 10/2/2017 2001 TenThreeTwenty Columbia, MD 1 — 3,126 16,361 1,932 — 3,126 18,293 21,419 (2,370) 10/2/2017 1982 3300 75th Avenue Landover, MD 1 — 4,110 36,371 3,140 — 4,110 39,511 43,621 (11,474) 2/26/2010 1985 Redland 520/530 Rockville, MD 3 — 12,714 61,377 4,267 — 12,714 65,644 78,358 (7,105) 10/2/2017 2008 Redland 540 Rockville, MD 1 — 10,740 17,714 6,113 — 10,740 23,827 34,567 (4,390) 10/2/2017 2003 Rutherford Business Park Windsor Mill, MD 1 — 1,598 10,219 545 — 1,598 10,764 12,362 (2,438) 11/16/2012 1972 3550 Green Court Ann Arbor, MI 1 — 3,630 4,857 — — 3,630 4,857 8,487 (429) 12/31/2018 1998 11411 E. Jefferson Avenue Detroit, MI 1 — 630 18,002 567 — 630 18,569 19,199 (5,358) 4/23/2010 2009 Rosedale Corporate Plaza Roseville, MN 1 — 672 6,045 1,547 — 672 7,592 8,264 (4,338) 12/1/1999 1987 1300 Summit Street Kansas City, MO 1 — 2,776 12,070 900 — 2,776 12,970 15,746 (2,978) 9/27/2012 1998 2555 Grand Boulevard Kansas City, MO 1 — 4,209 51,522 4,402 — 4,209 55,924 60,133 (4,550) 12/31/2018 2003 4241 NE 34th Street Kansas City, MO 1 — 1,133 5,649 4,705 — 1,470 10,017 11,487 (4,995) 3/31/1997 1995 1220 Echelon Parkway Jackson, MS 1 — 440 25,458 529 — 440 25,987 26,427 (6,103) 7/25/2012 2009 2300 and 2400 Yorkmont Road Charlotte, NC 2 — 1,334 19,075 2,509 — 1,334 21,584 22,918 (1,966) 12/31/2018 1995 18010 and 18020 Burt Street Omaha, NE 2 — 6,977 12,500 — — 6,977 12,500 19,477 (1,039) 12/31/2018 2012 500 Charles Ewing Boulevard Ewing, NJ 1 — 4,808 26,002 — — 4,808 26,002 30,810 (2,162) 12/31/2018 2012 299 Jefferson Road Parsippany, NJ 1 — 4,543 2,914 865 — 4,543 3,779 8,322 (386) 12/31/2018 2011 Initial Cost to Company Costs Capitalized Subsequent to Acquisition Cost amount carried at Close of Period Property Location Number of Properties Encumbrances (1) Land Buildings Impairments/ Land Buildings Total (2) Accumulated (3) Date(s) Original One Jefferson Road Parsippany, NJ 1 — 4,415 5,249 63 — 4,415 5,312 9,727 (439) 12/31/2018 2009 Airline Corporate Center Colonie, NY 1 — 790 6,400 1,141 — 790 7,541 8,331 (1,652) 6/22/2012 2004 5000 Corporate Court Holtsville, NY 1 — 6,530 17,711 4,330 — 6,530 22,041 28,571 (5,956) 8/31/2011 2000 1212 Pittsford - Victor Road Pittsford, NY 1 — 608 78 538 — 608 616 1,224 (67) 12/31/2018 1965 2231 Schrock Road Columbus, OH 1 — 716 217 283 — 716 500 1,216 (63) 12/31/2018 1999 4600 25th Avenue Salem, OR 1 — 6,510 17,973 6,355 — 6,510 24,328 30,838 (5,918) 12/20/2011 1957 8800 Tinicum Boulevard Philadelphia, PA 1 — 5,573 22,686 2,396 — 5,573 25,082 30,655 (1,976) 12/31/2018 2000 446 Wrenplace Road Fort Mill, SC 1 — 5,031 22,524 — — 5,031 22,524 27,555 (577) 12/22/2020 2019 9680 Old Bailes Road Fort Mill, SC 1 — 834 2,944 53 — 834 2,997 3,831 (247) 12/31/2018 2007 16001 North Dallas Parkway Addison, TX 2 — 10,282 63,071 945 — 10,282 64,016 74,298 (5,636) 12/31/2018 1987 Research Park Austin, TX 2 — 4,258 13,747 247 — 4,258 13,994 18,252 (2,103) 12/31/2018 1999 10451 Clay Road Houston, TX 1 — 5,495 10,253 — — 5,495 10,253 15,748 (854) 12/31/2018 2013 202 North Castlegory Road Houston, TX 1 — 863 5,024 — — 863 5,024 5,887 (393) 12/31/2018 2016 6380 Rogerdale Road Houston, TX 1 — 12,628 6,113 1,092 — 12,628 7,205 19,833 (550) 12/31/2018 2006 4221 W. John Carpenter Freeway Irving, TX 1 — 1,413 2,365 1,843 — 1,413 4,208 5,621 (736) 12/31/2018 1995 8675,8701-8711 Freeport Pkwy and 8901 Esters Boulevard Irving, TX 3 — 10,185 31,566 68 — 10,185 31,634 41,819 (2,625) 12/31/2018 1990 1511 East Common Street New Braunfels, TX 1 — 4,965 1,266 222 — 4,965 1,488 6,453 (124) 12/31/2018 2005 2900 West Plano Parkway Plano, TX 1 — 6,819 8,831 — — 6,819 8,831 15,650 (734) 12/31/2018 1998 3400 West Plano Parkway Plano, TX 1 — 4,543 15,964 321 — 4,543 16,285 20,828 (1,369) 12/31/2018 1994 3600 Wiseman Boulevard San Antonio, TX 1 — 3,493 6,662 3,300 — 3,493 9,962 13,455 (1,129) 12/31/2018 2004 701 Clay Road Waco, TX 1 — 2,030 8,708 14,327 — 2,060 23,005 25,065 (7,173) 12/23/1997 1997 1800 Novell Place Provo, UT 1 — 7,487 43,487 124 — 7,487 43,611 51,098 (3,906) 12/31/2018 2000 4885-4931 North 300 West Provo, UT 2 — 3,915 9,429 21 — 3,915 9,450 13,365 (834) 12/31/2018 2009 14660, 14672 & 14668 Lee Road Chantilly, VA 3 — 6,966 74,214 6,172 — 6,966 80,386 87,352 (10,355) 12/22/2016 1998; 2002; 2006 1434 Crossways Chesapeake, VA 2 — 3,617 19,527 2,673 — 3,617 22,200 25,817 (2,680) 10/2/2017 1998 Enterchange at Meadowville Chester, VA 1 — 1,478 9,594 424 — 1,478 10,018 11,496 (2,077) 8/28/2013 1999 Three Flint Hill Fairfax, VA 1 — 5,991 25,536 3,118 — 5,991 28,654 34,645 (4,356) 10/2/2017 1984 7987 Ashton Avenue Manassas, VA 1 — 1,562 8,253 1,059 — 1,562 9,312 10,874 (1,311) 1/3/2017 1989 Two Commercial Place Norfolk, VA 1 — 4,494 21,508 575 — 4,494 22,083 26,577 (1,744) 12/31/2018 1974 Initial Cost to Company Costs Capitalized Subsequent to Acquisition Cost amount carried at Close of Period Property Location Number of Properties Encumbrances (1) Land Buildings Impairments/ Land Buildings Total (2) Accumulated (3) Date(s) Original 1759 & 1760 Business Center Drive Reston, VA 2 — 9,066 78,658 7,007 — 9,066 85,665 94,731 (15,947) 5/28/2014 1987 1775 Wiehle Avenue Reston, VA 1 — 4,138 26,120 2,000 — 4,138 28,120 32,258 (3,312) 10/2/2017 2001 9201 Forest Hill Avenue Richmond, VA 1 — 1,344 375 466 — 1,344 841 2,185 (100) 12/31/2018 1985 9960 Mayland Drive Richmond, VA 1 — 2,614 15,930 3,392 — 2,614 19,322 21,936 (3,720) 5/20/2014 1994 Parham Place Richmond, VA 3 — 913 1,099 563 — 913 1,662 2,575 (132) 12/31/2018 1989; 2012 1751 Blue Hills Drive Roanoke, VA 1 — 2,689 7,761 — — 2,689 7,761 10,450 (645) 12/31/2018 2003 Atlantic Corporate Park Sterling, VA 2 — 5,752 29,316 2,713 — 5,752 32,029 37,781 (3,499) 10/2/2017 2008 Orbital Sciences Campus Sterling, VA 3 — 12,275 19,320 780 — 12,275 20,100 32,375 (1,754) 12/31/2018 2001 Sterling Business Park Lots 8 and 9 Sterling, VA 1 — 5,871 44,324 103 — 5,871 44,427 50,298 (4,714) 10/2/2017 2016 65 Bowdoin Street S. Burlington, VT 1 — 700 8,416 140 — 700 8,556 9,256 (2,524) 4/9/2010 2009 840 North Broadway Everett, WA 2 — 3,360 15,376 3,228 — 3,360 18,604 21,964 (4,189) 6/28/2012 1985 Stevens Center Richland, WA 2 — 3,970 17,035 5,594 — 4,042 22,557 26,599 (12,408) 3/31/1997 1995 351, 401, 501 Elliott Ave West Seattle, WA 3 — 26,640 52,740 5,782 — 26,640 58,522 85,162 (4,705) 12/31/2018 2000 5353 Yellowstone Road Cheyenne, WY 1 — 1,915 8,217 1,882 — 1,950 10,064 12,014 (5,551) 3/31/1997 1995 174 $ 98,178 $ 875,529 $ 2,658,896 $ 388,903 $ (12,242) $ 874,108 $ 3,036,978 $ 3,911,086 $ (495,912) Properties Held for Sale 2115 East Jefferson Street (4) Rockville, MD 1 — 3,349 11,152 592 (8,646) 1,678 4,769 6,447 — 8/27/2013 1981 Greenbrier Towers (5) Chesapeake, VA 2 — 3,437 11,241 3,067 — 3,437 14,308 17,745 (2,354) 10/2/2017 1985 11050 West Liberty Drive Milwaukee, WI 1 — 945 4,539 103 (1,989) 781 2,817 3,598 — 6/9/2011 2006 4 — 7,731 26,932 3,762 (10,635) 5,896 21,894 27,790 (2,354) 178 $ 98,178 $ 883,260 $ 2,685,828 $ 392,665 $ (22,877) $ 880,004 $ 3,058,872 $ 3,938,876 $ (498,266) (1) Represents mortgage debt, net of the unamortized balance of the fair value adjustments and debt issuance costs totaling $123. (2) Excludes the value of real estate intangibles. Aggregate cost for federal income tax purposes is approximately $7,358,924. (3) Depreciation on building and improvements is provided for periods ranging up to 40 years and on equipment up to 12 years. (4) This property was sold in January 2022. (5) These properties were sold in February 2022. An analysis of the carrying amount of real estate properties and accumulated depreciation is as follows: Real Estate Properties Accumulated Depreciation Balance at December 31, 2018 $ 3,944,636 $ 375,147 Additions 66,221 89,398 Loss on asset impairment (22,255) — Disposals (424,302) (64,167) Cost basis adjustment (1) (9,169) (9,169) Reclassification of assets of properties held for sale (61,900) (3,553) Balance at December 31, 2019 3,493,231 387,656 Additions 122,116 83,828 Loss on asset impairment (2,954) — Disposals (31,193) (13,125) Cost basis adjustment (1) (3,968) (3,968) Reclassification of assets of properties held for sale (55,089) (2,477) Balance at December 31, 2020 3,522,143 451,914 Additions 584,805 92,266 Loss on asset impairment (58,696) — Disposals (72,137) (8,675) Cost basis adjustment (1) (37,239) (37,239) Reclassification of assets of properties held for sale (27,790) (2,354) Balance at December 31, 2021 $ 3,911,086 $ 495,912 (1) Represents the reclassification between accumulated depreciation and building made to certain properties reclassified as assets of properties held for sale at fair value less costs to sell in accordance with GAAP.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation. These consolidated financial statements include the accounts of us and our subsidiaries, all of which are wholly owned directly or indirectly by us. All intercompany transactions and balances with or among our consolidated subsidiaries have been eliminated.
Real Estate Properties	Real Estate Properties. We record our properties at cost and provide depreciation on real estate investments on a straight line basis over estimated useful lives generally ranging from 7 to 40 years. In some circumstances, we engage independent real estate appraisal firms to provide market information and evaluations which are relevant to our purchase price allocations and determinations of useful lives; however, we are ultimately responsible for the purchase price allocations and determinations of useful lives. We allocate the purchase prices of our properties to land, buildings and improvements based on determinations of the relative fair values of these assets assuming the properties are vacant. We determine the fair value of each property using methods similar to those used by independent appraisers, which may involve estimated cash flows that are based on a number of factors, including capitalization rates and discount rates, among others. We allocate a portion of the purchase price of our properties to above market and below market leases based on the present value (using an interest rate which reflects the risks associated with acquired in place leases at the time each property was acquired by us) of the difference, if any, between (i) the contractual amounts to be paid pursuant to the acquired in place leases and (ii) our estimates of fair market lease rates for the corresponding leases, measured over a period equal to the terms of the respective leases. We allocate a portion of the purchase price to acquired in place leases and tenant relationships based upon market estimates to lease up the property based on the leases in place at the time of purchase. We allocate this aggregate value between acquired in place lease values and tenant relationships based on our evaluation of the specific characteristics of each tenant’s lease. However, we have not separated the value of tenant relationships from the value of acquired in place leases because such value and related amortization expense is immaterial to the accompanying consolidated financial statements. In making these allocations, we consider factors such as estimated carrying costs during the expected lease up periods, including real estate taxes, insurance and other operating income and expenses and costs, such as leasing commissions, legal and other related expenses, to execute similar leases in current market conditions at the time a property was acquired by us. If the value of tenant relationships becomes material in the future, we may separately allocate those amounts and amortize the allocated amounts over the estimated life of the relationships. For transactions that qualify as business combinations, we allocate the excess, if any, of the consideration over the fair value of the assets acquired to goodwill. We amortize capitalized above market lease values (included in acquired real estate leases, net in our consolidated balance sheets) and below market lease values (presented as assumed real estate lease obligations, net in our consolidated balance sheets) as a reduction or increase, respectively, to rental income over the terms of the associated leases. Such amortization resulted in net decreases to rental income of $2,288, $5,440 and $2,710 during the years ended December 31, 2021, 2020 and 2019, respectively. We amortize the value of acquired in place leases (included in acquired real estate leases, net in our consolidated balance sheets), exclusive of the value of above market and below market acquired in place leases, over the terms of the associated leases. Such amortization, which is included in depreciation and amortization expense, amounted to $142,538, $161,752 and $195,268 during the years ended December 31, 2021, 2020 and 2019, respectively. If a lease is terminated prior to its stated expiration, we write off the unamortized amounts relating to that lease.
Cash and Cash Equivalents	Cash and Cash Equivalents. We consider highly liquid investments with original maturities of three months or less at the date of purchase to be cash equivalents.
Restricted Cash	Restricted Cash. Restricted cash consists of amounts escrowed for future real estate taxes, insurance, leasing costs, capital expenditures and debt service, as required by certain of our mortgage debts.
Deferred Leasing Costs	Deferred Leasing Costs. Deferred leasing costs include brokerage costs and inducements associated with our entering leases. We amortize deferred leasing costs, which are included in depreciation and amortization expense, and inducements, which are included as a reduction to rental income, on a straight line basis over the terms of the respective leases. Legal costs associated with the execution of our leases are expensed as incurred and included in general and administrative expenses in our consolidated statements of comprehensive income (loss). We recorded amortization of deferred leasing costs of $6,691, $5,985 and $5,216, and reductions to rental income related to the amortization of inducements of $1,187, $902 and $757 for the years ended December 31, 2021, 2020 and 2019, respectively.
Debt Issuance Costs	Debt Issuance Costs. Costs related to the issuance or assumption of debt are capitalized and amortized to interest expense over the terms of the respective loans. Debt issuance costs, net of accumulated amortization, for our revolving credit facility are included in other assets in our consolidated balance sheets. As of December 31, 2021 and 2020, debt issuance costs for our revolving credit facility were $4,125 and accumulated amortization of debt issuance costs for our revolving credit facility were $3,079 and $2,069, respectively. Debt issuance costs, net of accumulated amortization, for our senior unsecured notes and mortgage notes payable are presented as a direct deduction from the associated debt liability in our consolidated balance sheets.
Equity Securities	Equity Securities. We previously owned 2,801,060 common shares of class A common stock of The RMR Group Inc., or RMR Inc. Prior to the sale of our shares of RMR Inc. class A common stock on July 1, 2019, our equity securities were recorded at fair value based on their quoted market price at the end of each reporting period.
Equity Method Investments	Equity Method Investments. We previously accounted for our investment in Affiliates Insurance Company, or AIC, until AIC was dissolved on February 13, 2020, using the equity method of accounting. Significant influence was present through common representation on the boards of trustees or directors of us and AIC. See Note 6 for more information regarding our investment in AIC. We also have noncontrolling ownership interests of 51% and 50% in two unconsolidated joint ventures that own three properties. The properties owned by these joint ventures are encumbered by an aggregate of $82,000 of mortgage indebtedness. We do not control the activities that are most significant to these joint ventures and, as a result, we account for our investments in these joint ventures under the equity method of accounting. See Note 3 for more information regarding our unconsolidated joint ventures.
Revenue Recognition	Revenue Recognition. We are a lessor of commercial office properties. Our leases provide our tenants with the contractual right to use and economically benefit from all of the physical space specified in the leases; therefore, we have determined to evaluate our leases as lease arrangements. Our leases provide for base rent payments and in addition may include variable payments. Rental income from operating leases, including any payments derived by index or market-based indices, is recognized on a straight line basis over the lease term when we have determined that the collectability of substantially all of the lease payments is probable. Some of our leases have options to extend or terminate the lease exercisable at the option of our tenants, which are considered when determining the lease term. Allowances for bad debts are recognized as a direct reduction of rental income. Certain of our leases contain non-lease components, such as property level operating expenses and capital expenditures reimbursed by our tenants as well as other required lease payments. We have made the policy election to not separate the lease and non-lease components because (i) the lease components are operating leases and (ii) the timing and pattern of recognition of the non-lease components are the same as those of the lease components. We apply Accounting Standards Codification 842, Leases , to the combined component. Income derived by our leases is recorded in rental income in our consolidated statements of comprehensive income (loss). Certain tenants are obligated to pay directly their obligations under their leases for insurance, real estate taxes and certain other expenses. These obligations, which have been assumed by the tenants under the terms of their respective leases, are not reflected in our consolidated financial statements. To the extent any tenant responsible for any such obligations under the applicable lease defaults on such lease or if it is deemed probable that the tenant will fail to pay for such obligations, we would record a liability for such obligations. See Note 4 for more information regarding our leases.
Income Taxes	Income Taxes. We have elected to be taxed as a REIT under the United States Internal Revenue Code of 1986, as amended, and, accordingly, we generally will not be subject to federal income taxes provided we distribute our taxable income and meet certain other requirements to qualify for taxation as a REIT. We are, however, subject to certain state and local taxes.
Cumulative Other Comprehensive Income	Cumulative Other Comprehensive Income (Loss). Cumulative other comprehensive income (loss) represents our share of the cumulative comprehensive income and losses of our equity method investees.
Per Common Share Amounts	Per Common Share Amounts. We calculate basic earnings per common share by dividing net income (loss) by the weighted average number of our common shares of beneficial ownership, $.01 par value, or our common shares, outstanding during the period. We calculate diluted earnings per share using the more dilutive of the two class method or the treasury stock method. Unvested share awards and other potentially dilutive common shares, together with the related impact on earnings, are considered when calculating diluted earnings per share.
Use of Estimates	Use of Estimates. Preparation of these financial statements in conformity with GAAP requires us to make estimates and assumptions that may affect the amounts reported in these consolidated financial statements and related notes. The actual results could differ from these estimates. Significant estimates in the consolidated financial statements include purchase price allocations, useful lives of fixed assets and assessment of impairment of real estate and the related intangibles.
Segment Reporting	Segment Reporting. We operate in one business segment: direct ownership of real estate properties.
New Accounting Pronouncements	New Accounting Pronouncements. In October 2021, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, No. 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers , or ASU No. 2021-08, which requires that an acquirer account for the related revenue contracts in accordance with Topic 606 as if it had originated the contracts. The acquiring entity shall recognize and measure the acquired contract assets and contract liabilities consistent with how they were recognized and measured in the acquiree’s financial statements, rather than at fair value at the acquisition date. ASU No. 2021-08 is effective for fiscal years beginning after December 15, 2022, with early adoption permitted. On October 1, 2021, we early adopted ASU No. 2021-08. The adoption of ASU No. 2021-08 did not have an impact on our consolidated financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Schedule of Real Estate Properties	As of December 31, 2021 and 2020, our acquired real estate leases and assumed real estate lease obligations, excluding properties classified as held for sale, were as follows: December 31, 2021 2020 Acquired real estate leases: Capitalized above market lease values $ 29,925 $ 34,972 Less: accumulated amortization (17,945) (19,291) Capitalized above market lease values, net 11,980 15,681 Lease origination value 885,250 868,459 Less: accumulated amortization (391,601) (335,197) Lease origination value, net 493,649 533,262 Acquired real estate leases, net $ 505,629 $ 548,943 Assumed real estate lease obligations: Capitalized below market lease values $ 29,488 $ 21,092 Less: accumulated amortization (12,454) (10,504) Assumed real estate lease obligations, net $ 17,034 $ 10,588

Real Estate Properties (Tables)

Real Estate Properties (Tables)	12 Months Ended
	Dec. 31, 2021
Real Estate [Abstract]
Schedule of Business Acquisitions, by Acquisition	We allocated the purchase prices of these acquisitions based on the relative estimated fair values of the acquired assets and assumed liabilities as follows: Acquisition Date Location Number of Properties Rentable Square Feet Purchase Price Land Buildings and Improvements Acquired Real Estate Leases Assumed Real Estate Lease Obligations June 2021 Chicago, IL (1) 1 531,000 $ 368,331 $ 42,935 $ 258,348 $ 76,136 $ (9,088) June 2021 Atlanta, GA 1 346,000 180,602 13,040 135,459 32,103 — August 2021 Boston, MA 1 49,000 27,545 16,103 10,217 1,225 — 3 926,000 $ 576,478 $ 72,078 $ 404,024 $ 109,464 $ (9,088) (1) Purchase price includes an adjustment of $13,031 to record an estimated real estate tax liability as of the acquisition date. Acquisition Date Location Number of Properties Rentable Square Feet Purchase Price Land Buildings and Improvements Acquired Real Estate Leases February 2020 Boston, MA 1 13,000 $ 11,864 $ 2,618 $ 9,246 $ — December 2020 Fort Mill, SC 1 150,000 35,351 5,031 22,526 7,794 2 163,000 $ 47,215 $ 7,649 $ 31,772 $ 7,794
Schedule of Disposal Groups	Date of Sale Number of Properties Location Rentable Square Feet Gross Sales Price (1) Gain (Loss) on Sale of Real Estate Loss on Impairment of Real Estate January 2021 — Kansas City, MO (2) (3) 10,000 $ 845 $ (63) $ — January 2021 1 Richmond, VA (2) 311,000 130,000 54,181 — April 2021 1 Huntsville, AL 1,371,000 39,000 — 5,383 July 2021 1 Fresno, CA 532,000 6,000 — 33,902 July 2021 1 Liverpool, NY 38,000 650 31 — August 2021 1 Memphis, TN 205,000 15,270 287 — September 2021 1 Stoneham, MA 98,000 6,650 (282) 5,911 October 2021 — Sterling, VA (4) — 28,500 24,200 — 6 2,565,000 $ 226,915 $ 78,354 $ 45,196 (1) Gross sales price is the gross contract price, excluding closing costs. (2) Properties were classified as held for sale as of December 31, 2020. (3) Consists of a warehouse facility adjacent to a property we own located in Kansas City, MO. (4) Consists of two vacant land parcels adjacent to properties we own located in Sterling, VA. As of December 31, 2021, the following four properties met the criteria to be classified as held for sale in our consolidated balance sheet: Date of Sale Agreement Location Number of Properties Rentable Square Feet Gross Sales Price (1) Loss on Impairment of Real Estate December 2021 Rockville, MD (2) 1 129,000 $ 6,750 $ 6,236 December 2021 Chesapeake, VA (3) 2 172,000 18,945 — January 2022 Milwaukee, WI 1 29,000 3,850 755 4 330,000 $ 29,545 $ 6,991 (1) Gross sales price is the gross contract price, excluding closing costs. (2) The sale of this property was completed in January 2022. (3) The sale of these properties was completed in February 2022. Date of Sale Number of Properties Location Rentable Square Feet Gross Sales Price (1) Gain (Loss) on Sale of Real Estate Loss on Impairment of Real Estate January 2020 2 Stafford, VA 65,000 $ 14,063 $ 4,771 $ — January 2020 1 Windsor, CT 97,000 7,000 314 — February 2020 1 Lincolnshire, IL 223,000 12,000 1,179 — March 2020 1 Trenton, NJ (2) 267,000 30,100 (179) — March 2020 1 Fairfax, VA 83,000 22,200 4,754 — October 2020 4 Fairfax, VA 171,000 25,100 16 2,954 10 906,000 $ 110,463 $ 10,855 $ 2,954 (1) Gross sales price is the gross contract price, excluding closing costs. (2) We recorded a $9,454 loss on impairment of real estate during the year ended December 31, 2019 to adjust the carrying value of this property to its fair value less costs to sell. Date of Sale Number of Properties Location Rentable Square Feet Gross Sales Price (1) Gain (Loss) on Sale of Real Estate Loss on Impairment of Real Estate February 2019 34 Northern Virginia and Maryland 1,636,000 $ 198,500 $ — $ 732 March 2019 1 Washington, D.C. (2) 129,000 70,000 22,075 — May 2019 1 Buffalo, NY 122,000 16,900 — 5,137 May 2019 1 Maynard, MA 287,000 5,000 (227) — June 2019 1 Kapolei, HI 417,000 7,100 — — July 2019 1 San Jose, CA 72,000 14,000 (270) — July 2019 1 Nashua, NH 322,000 25,000 8,401 — August 2019 1 Arlington, TX 182,000 14,900 187 — August 2019 1 Rochester, NY 95,000 4,765 (104) — August 2019 1 Hanover, PA 502,000 5,500 (417) — August 2019 1 San Antonio, TX 618,000 198,000 3,869 — September 2019 1 Topeka, KS 144,000 15,600 36 — September 2019 1 Falling Waters, WV 40,000 650 — 2,179 September 2019 1 San Diego, CA 44,000 8,950 3,062 — October 2019 3 Columbia, SC 181,000 10,750 — 3,581 November 2019 3 Metro DC - MD 373,000 61,938 1,177 — December 2019 1 San Diego, CA 148,000 23,750 6,823 — December 2019 1 Phoenix, AZ 123,000 12,850 860 — December 2019 1 Houston, TX 497,000 130,000 59,992 — December 2019 1 Kansas City, KS 171,000 11,700 — 1,172 December 2019 1 San Jose, CA 76,000 13,000 (333) — 58 6,179,000 $ 848,853 $ 105,131 $ 12,801 (1) Gross sales price is the gross contract price, excluding closing costs. (2) Represents an individually significant disposition.
Schedule of Joint Ventures	As of December 31, 2021 and 2020, our investments in unconsolidated joint ventures consisted of the following: OPI Ownership OPI Carrying Value of Investments at December 31, Number of Properties Location Rentable Square Feet Joint Venture 2021 2020 Prosperity Metro Plaza 51% $ 20,672 $ 21,888 2 Fairfax, VA 329,000 1750 H Street, NW 50% 14,166 16,063 1 Washington, D.C. 115,000 Total $ 34,838 $ 37,951 3 444,000 The following table provides a summary of the mortgage debt of our two unconsolidated joint ventures: Joint Venture Interest Rate (1) Maturity Date Principal Balance at December 31, 2021 and 2020 (2) Prosperity Metro Plaza 4.09% 12/1/2029 $ 50,000 1750 H Street, NW 3.69% 8/1/2024 32,000 Weighted Average/Total 3.93% $ 82,000 (1) Includes the effect of mark to market purchase accounting. (2) Reflects the entire balance of the debt secured by the properties and is not adjusted to reflect the interests in the joint ventures we do not own. None of the debt is recourse to us.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity	The following operating lease maturity analysis presents the future contractual lease payments to be received by us through 2053 as of December 31, 2021: Year Amount 2022 $ 456,350 2023 422,139 2024 360,282 2025 296,945 2026 253,313 Thereafter 1,267,710 Total $ 3,056,739

Indebtedness (Tables)

Indebtedness (Tables)	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Schedule of Long-Term Debt Instruments	At December 31, 2021 and 2020, our outstanding indebtedness consisted of the following: December 31, 2021 2020 Revolving credit facility, due in 2023 $ — $ — Senior unsecured notes, 4.15% interest rate, due in 2022 (1) — 300,000 Senior unsecured notes, 4.00% interest rate, due in 2022 300,000 300,000 Senior unsecured notes, 4.25% interest rate, due in 2024 350,000 350,000 Senior unsecured notes, 4.50% interest rate, due in 2025 650,000 650,000 Senior unsecured notes, 2.650% interest rate, due in 2026 (2) 300,000 — Senior unsecured notes, 2.400% interest rate, due in 2027 (3) 350,000 — Senior unsecured notes, 3.450% interest rate, due in 2031 (4) 400,000 — Senior unsecured notes, 5.875% interest rate, due in 2046 (5) — 310,000 Senior unsecured notes, 6.375% interest rate, due in 2050 162,000 162,000 Mortgage note payable, 8.150% interest rate, due in 2021 (6) — 350 Mortgage note payable, 4.220% interest rate, due in 2022 (7) 25,055 25,804 Mortgage note payable, 3.550% interest rate, due in 2023 (8) — 71,000 Mortgage note payable, 3.700% interest rate, due in 2023 50,000 50,000 Mortgage note payable, 4.800% interest rate, due in 2023 23,246 23,688 2,610,301 2,242,842 Unamortized debt premiums, discounts and issuance costs (32,351) (39,871) $ 2,577,950 $ 2,202,971 (1) These senior notes were redeemed in September 2021. (2) These senior notes were issued in May 2021. (3) These senior notes were issued in August 2021. (4) These senior notes were issued in September 2021. (5) These senior notes were redeemed in June 2021. (6) This mortgage note was paid in full as of its maturity date. (7) In February 2022, we gave notice of our intention to prepay this mortgage note at par plus accrued interest. We expect to make this prepayment in April 2022. (8) This mortgage note was prepaid in June 2021.
Schedule of Required Principal Payments	The required principal payments due during the next five years and thereafter under all our outstanding consolidated debt as of December 31, 2021 are as follows: Year Principal Payment 2022 (1) $ 325,517 2023 72,784 2024 350,000 2025 650,000 2026 300,000 Thereafter 912,000 Total $ 2,610,301 (2) (1) In February 2022, we gave notice of our intention to prepay, at par plus accrued interest, a mortgage note secured by one property with an outstanding principal balance of $25,055 at December 31, 2021, an annual interest rate of 4.22% and a maturity date in July 2022. (2) Total consolidated debt outstanding as of December 31, 2021, net of unamortized premiums, discounts and issuance costs totaling $32,351, was $2,577,950.

Fair Value of Assets and Liab_2

Fair Value of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Assets Measured at Fair Value	The following table presents certain of our assets measured at fair value at December 31, 2021, categorized by the level of inputs, as defined in the fair value hierarchy under GAAP, used in the valuation of each asset: Fair Value at Reporting Date Using Description Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Non-recurring Fair Value Measurements Assets Assets of properties held for sale (1) $ 10,600 $ — $ 10,600 $ — (1) We recorded impairment charges of $6,991 to reduce the carrying value of two properties that are classified as held for sale in our consolidated balance sheet to their estimated fair value, less estimated costs to sell of $555, based on negotiated sales prices with third party buyers (Level 2 inputs as defined in the fair value hierarchy under GAAP). See Note 3 for more information.
Schedule of Fair Value and Carrying Value of Financial Instruments	At December 31, 2021 and 2020, the fair values of our financial instruments approximated their carrying values in our consolidated financial statements, due to their short term nature or floating interest rates, except as follows: As of December 31, 2021 As of December 31, 2020 Financial Instrument Carrying Value (1) Fair Value Carrying Value (1) Fair Value Senior unsecured notes, 4.15% interest rate, due in 2022 (2) $ — $ — $ 298,853 $ 306,192 Senior unsecured notes, 4.00% interest rate, due in 2022 299,500 304,148 298,579 306,756 Senior unsecured notes, 4.25% interest rate, due in 2024 344,581 365,449 342,299 365,435 Senior unsecured notes, 4.50% interest rate, due in 2025 639,370 687,749 635,921 688,399 Senior unsecured notes, 2.650% interest rate, due in 2026 (3) 297,213 298,502 — — Senior unsecured notes, 2.400% interest rate, due in 2027 (4) 346,845 339,764 — — Senior unsecured notes, 3.450% interest rate, due in 2031 (5) 395,744 388,458 — — Senior unsecured notes, 5.875% interest rate, due in 2046 (6) — — 301,264 322,028 Senior unsecured notes, 6.375% interest rate, due in 2050 156,519 177,098 156,326 171,590 Mortgage notes payable 98,178 100,294 169,729 174,952 Total $ 2,577,950 $ 2,661,462 $ 2,202,971 $ 2,335,352 (1) Includes unamortized debt premiums, discounts and issuance costs totaling $32,351 and $39,871 as of December 31, 2021 and 2020, respectively. (2) These senior notes were redeemed in September 2021. (3) These senior notes were issued in May 2021. (4) These senior notes were issued in August 2021. (5) These senior notes were issued in September 2021. (6) These senior notes were redeemed in June 2021.

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Summary of Shares Granted And Vested Under The Terms of The Entity's 2009 Plan	A summary of shares awarded, forfeited, vested and unvested under the terms of the 2009 Plan for the years ended December 31, 2021, 2020 and 2019, is as follows: 2021 2020 2019 Number of Shares Weighted Average Grant Date Fair Value Number of Shares Weighted Average Grant Date Fair Value Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 157,521 $ 29.26 106,680 $ 40.16 55,321 $ 73.25 Awarded 145,800 $ 26.28 136,600 $ 23.77 136,100 $ 28.84 Forfeited (700) $ 25.97 (586) $ 43.75 (1,474) $ 49.10 Vested (120,397) $ 30.24 (85,173) $ 34.02 (83,267) $ 27.78 Unvested at end of year 182,224 $ 26.23 157,521 $ 29.26 106,680 $ 40.16
Schedule of Dividends	During the years ended December 31, 2021, 2020 and 2019, we paid distributions on our common shares as follows: Annual Per Share Distribution Total Distributions Characterization of Distributions Year Return of Capital Ordinary Income Qualified Dividend 2021 $ 2.20 $ 106,368 —% 100.00% —% 2020 $ 2.20 $ 106,121 —% 100.00% —% 2019 $ 2.20 $ 105,868 —% 100.00% —%

Organization (Details)

Organization (Details) ft² in Thousands	12 Months Ended
	Dec. 31, 2021ft²joint_ventureproperty	Dec. 31, 2020ft²
Real Estate Properties [Line Items]
Number of properties (in properties) | property	178
Rentable area of properties (in square feet) | ft²	926	163
Number of joint ventures | joint_venture	2
Unconsolidated Joint Ventures
Real Estate Properties [Line Items]
Number of properties (in properties) | property	3
Rentable area of properties (in square feet) | ft²	444
Number of joint ventures | joint_venture	2
Joint Venture Property 1
Real Estate Properties [Line Items]
Percentage of ownership interest	51.00%
Joint Venture Property 2
Real Estate Properties [Line Items]
Percentage of ownership interest	50.00%

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Real Estate Properties, Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real Estate [Line Items]
Net decreases to rental income from amortization of capitalized above market and below market leases	$ 2,288	$ 5,440	$ 2,710
Amortization of the value of leases	144,826	167,192	197,978
Projected future amortization of net intangible lease assets and liabilities, excluding those classified as discontinued operations
2022	121,814
2023	99,643
2024	77,107
2025	56,168
2026	41,393
Thereafter	$ 92,470
Minimum | Buildings and Improvements
Real Estate [Line Items]
Property, plant and equipment, useful life	7 years
Maximum | Buildings and Improvements
Real Estate [Line Items]
Property, plant and equipment, useful life	40 years
Weighted Average
Real Estate [Line Items]
Below market, acquired lease amortization period	10 years 3 months 18 days
Above Market Lease | Weighted Average
Real Estate [Line Items]
Acquired lease amortization period	3 years 3 months 18 days
Original Value Lease
Real Estate [Line Items]
Amortization of the value of leases	$ 142,538	$ 161,752	$ 195,268
Original Value Lease | Weighted Average
Real Estate [Line Items]
Acquired lease amortization period	6 years 3 months 18 days

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Schedule of Real Estate Assets and Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Real Estate [Line Items]
Acquired real estate leases, net	$ 505,629	$ 548,943
Capitalized below market lease values	29,488	21,092
Less: accumulated amortization	(12,454)	(10,504)
Assumed real estate lease obligations, net	17,034	10,588
Above Market Lease
Real Estate [Line Items]
Real estate leases	29,925	34,972
Less: accumulated amortization	(17,945)	(19,291)
Acquired real estate leases, net	11,980	15,681
Original Value Lease
Real Estate [Line Items]
Real estate leases	885,250	868,459
Less: accumulated amortization	(391,601)	(335,197)
Acquired real estate leases, net	$ 493,649	$ 533,262

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Deferred Leasing and Debt Issuance Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Amortization of deferred leasing costs	$ 6,691	$ 5,985	$ 5,216
Deferred sales inducement cost, amortization expense	1,187	902	$ 757
Deferred leasing costs, gross	74,469	59,691
Accumulated amortization of deferred leasing costs	20,586	17,065
Future amortization of deferred leasing costs, excluding those classified as discontinued operations
2022	8,536
2023	7,798
2024	6,739
2025	5,784
2026	5,132
Thereafter	19,894
Deferred financing fees, net	16,120	17,545
Future amortization of deferred financing fees
2022	3,514
2023	2,217
2024	2,155
2025	1,669
2026	1,335
Thereafter	6,276
Unsecured Revolving Credit Facility
Future amortization of deferred leasing costs, excluding those classified as discontinued operations
Deferred financing fees, gross	4,125	4,125
Accumulated amortization of deferred financing fees	$ 3,079	$ 2,069

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Equity Securities (Details)	Dec. 31, 2019shares
Class A Common Shares | RMR Inc
Related Party Transaction [Line Items]
Common shares owned in RMR Inc. (in shares)	2,801,060

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)joint_venturepropertysegment$ / sharesshares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019USD ($)shares	Jun. 05, 2015USD ($)shares
Schedule of Equity Method Investments [Line Items]
Number of joint ventures | joint_venture	2
Number of properties (in properties) | property	178
Unamortized discount (premium), net	$ 15,232
Common shares of beneficial interest, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Antidilutive securities (in shares) | shares	34,000	14,000	12,000
Number of business segments | segment	1
Joint Venture Property 1
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest	51.00%
Joint Venture Property 2
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest	50.00%
RMR Inc
Schedule of Equity Method Investments [Line Items]
Equity securities, FV-NI (in shares) | shares				1,541,201
Equity securities, FV-NI, cost				$ 17,462
Unconsolidated Joint Ventures
Schedule of Equity Method Investments [Line Items]
Number of joint ventures | joint_venture	2
Number of properties (in properties) | property	3
Mortgage indebtedness	$ 82,000
Unconsolidated Joint Ventures
Schedule of Equity Method Investments [Line Items]
Number of joint ventures | joint_venture	2
Number of properties (in properties) | property	3
Unconsolidated Joint Ventures | Joint Venture Property 1
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest	51.00%
Unconsolidated Joint Ventures | Joint Venture Property 2
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest	50.00%
RMR Inc
Schedule of Equity Method Investments [Line Items]
Equity securities, FV-NI				$ 39,833
Amortization of liability	$ 1,087	$ 1,087	$ 1,087
Amortization of liability, year one	1,087
Amortization of liability, year two	1,087
Amortization of liability, year three	1,087
Amortization of liability, year four	1,087
Amortization of liability, year five	1,087
Amortization of liability, thereafter	$ 9,797

Real Estate Properties - Narrat

Real Estate Properties - Narrative (Details) ft² in Thousands, $ in Thousands	Feb. 15, 2022USD ($)ft²property	Dec. 31, 2021USD ($)ft²joint_venturepropertylease	Dec. 31, 2020USD ($)ft²property	Dec. 31, 2019USD ($)ft²property
Real Estate Properties [Line Items]
Number of properties (in properties) | property		178
Area of properties (in square feet) | ft²		926	163
Real estate aggregate undepreciated carrying value		$ 3,911,086	$ 3,522,143
Number of joint ventures | joint_venture		2
Number of leases entered | lease		85
Rentable square feet (in sqft) | ft²		2,484
Weighted average lease term		9 years 6 months
Expenditures committed on leases		$ 142,318
Operating leases committed expenditures on leases executed in period committed but unspent tenant related obligations		$ 121,754
Continuing Operations
Real Estate Properties [Line Items]
Area of properties (in square feet) | ft²		23,271
Real estate aggregate undepreciated carrying value		$ 3,938,876
Unconsolidated Joint Ventures
Real Estate Properties [Line Items]
Number of properties (in properties) | property		3
Area of properties (in square feet) | ft²		444
Number of joint ventures | joint_venture		2
Joint Venture Property 1
Real Estate Properties [Line Items]
Percentage of ownership interest		51.00%
Joint Venture Property 2
Real Estate Properties [Line Items]
Percentage of ownership interest		50.00%
Disposal Group, Held-for-sale, Not Discontinued Operations
Real Estate Properties [Line Items]
Number of properties (in properties) | property		4
Area of properties (in square feet) | ft²		330
Gross Sales Price, excluding closing costs		$ 29,545
Disposal Group, Held-for-sale, Not Discontinued Operations | Subsequent Event
Real Estate Properties [Line Items]
Number of properties (in properties) | property	1
Area of properties (in square feet) | ft²	29
Gross Sales Price, excluding closing costs	$ 3,850
Disposal Group, Held-for-sale, Not Discontinued Operations | Continuing Operations
Real Estate Properties [Line Items]
Carrying value		$ 27,790
Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of real estate properties sold (in properties) | property			10	58
Number of properties (in properties) | property			10	58
Area of properties (in square feet) | ft²			906	6,179
Gross Sales Price, excluding closing costs			$ 110,463	$ 848,853
Disposal Group, Disposed of by Sale | Kansas City, MO
Real Estate Properties [Line Items]
Number of real estate properties sold (in properties) | property		6

Real Estate Properties - Acquis

Real Estate Properties - Acquisition Activities (Details) ft² in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2019USD ($)	Dec. 31, 2021USD ($)ft²property	Dec. 31, 2020USD ($)ft²property
Business Acquisition [Line Items]
Number of properties acquired | property		3	2
Rentable Square Feet (in square feet) | ft²		926	163
Asset acquisition, consideration transferred		$ 576,478	$ 47,215
Purchase price adjustments		1,761
Asset acquisition, acquisition related costs		1,264	590
Assumed Real Estate Lease Obligations		(9,088)
Land
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		72,078	7,649
Buildings and Improvements
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		404,024	31,772
Acquired Real Estate Leases
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		$ 109,464	$ 7,794
Chicago, IL
Business Acquisition [Line Items]
Number of properties acquired | property		1
Rentable Square Feet (in square feet) | ft²		531
Asset acquisition, consideration transferred		$ 368,331
Assumed Real Estate Lease Obligations		(9,088)
Adjustment for estimated tax liability		13,031
Chicago, IL | Land
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		42,935
Chicago, IL | Buildings and Improvements
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		258,348
Chicago, IL | Acquired Real Estate Leases
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		$ 76,136
Atlanta, GA
Business Acquisition [Line Items]
Number of properties acquired | property		1
Rentable Square Feet (in square feet) | ft²		346
Asset acquisition, consideration transferred		$ 180,602
Assumed Real Estate Lease Obligations		0
Atlanta, GA | Land
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		13,040
Atlanta, GA | Buildings and Improvements
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		135,459
Atlanta, GA | Acquired Real Estate Leases
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		$ 32,103
Boston, MA
Business Acquisition [Line Items]
Number of properties acquired | property		1	1
Rentable Square Feet (in square feet) | ft²		49	13
Asset acquisition, consideration transferred	$ 2,900	$ 27,545	$ 11,864
Assumed Real Estate Lease Obligations		0
Boston, MA | Land
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		16,103	2,618
Boston, MA | Buildings and Improvements
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		10,217	9,246
Boston, MA | Acquired Real Estate Leases
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		$ 1,225	$ 0
Fort Mill, SC
Business Acquisition [Line Items]
Number of properties acquired | property			1
Rentable Square Feet (in square feet) | ft²			150
Asset acquisition, consideration transferred			$ 35,351
Fort Mill, SC | Land
Business Acquisition [Line Items]
Asset acquisition, consideration transferred			5,031
Fort Mill, SC | Buildings and Improvements
Business Acquisition [Line Items]
Asset acquisition, consideration transferred			22,526
Fort Mill, SC | Acquired Real Estate Leases
Business Acquisition [Line Items]
Asset acquisition, consideration transferred			$ 7,794

Real Estate Properties - Dispos

Real Estate Properties - Disposition Activities (Details) ft² in Thousands, $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Nov. 30, 2021USD ($)property	Sep. 30, 2021USD ($)property	Dec. 31, 2021USD ($)ft²propertyparcel_of_land	Dec. 31, 2020USD ($)ft²property	Dec. 31, 2019USD ($)ft²property
Real Estate Properties [Line Items]
Number of properties (in properties) | property			178
Gain on sale of real estate			$ 78,354	$ 10,855	$ 105,131
Loss on Impairment of Real Estate			$ 62,420	$ 2,954	$ 22,255
Rentable Square Feet (in square feet) | ft²			926	163
Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property				10	58
Rentable Square Feet | ft²			2,565
Gross Sales Price			$ 226,915
Number of Properties (in properties) | property			6
Gain on sale of real estate			$ 78,354	$ 10,855	$ 105,131
Loss on Impairment of Real Estate			$ 45,196	$ 2,954	$ 12,801
Rentable Square Feet (in square feet) | ft²				906	6,179
Gross Sales Price, excluding closing costs				$ 110,463	$ 848,853
Disposal Group, Disposed of by Sale | Mortgage notes payable, 5.9% interest rate, due in 2021 | Mortgage Note Payable
Real Estate Properties [Line Items]
Extinguishment of debt, amount				$ 13,095
Interest rate (as a percent)				5.90%
Disposal Group, Held-for-sale, Not Discontinued Operations
Real Estate Properties [Line Items]
Number of properties (in properties) | property			4
Loss on Impairment of Real Estate			$ 6,991
Rentable Square Feet (in square feet) | ft²			330
Gross Sales Price, excluding closing costs			$ 29,545
Kansas City, MO | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Rentable Square Feet | ft²			10
Gross Sales Price			$ 845
Number of Properties (in properties) | property			0
Gain on sale of real estate			$ (63)
Loss on Impairment of Real Estate			$ 0
Richmond, VA | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Rentable Square Feet | ft²			311
Gross Sales Price			$ 130,000
Number of Properties (in properties) | property			1
Gain on sale of real estate			$ 54,181
Loss on Impairment of Real Estate			$ 0
Huntsville, AL | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Rentable Square Feet | ft²			1,371
Gross Sales Price			$ 39,000
Number of Properties (in properties) | property			1
Gain on sale of real estate			$ 0
Loss on Impairment of Real Estate			$ 5,383
Fresno, CA | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Rentable Square Feet | ft²			532
Gross Sales Price			$ 6,000
Number of Properties (in properties) | property			1
Gain on sale of real estate			$ 0
Loss on Impairment of Real Estate			$ 33,902
Liverpool, NY | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Rentable Square Feet | ft²			38
Gross Sales Price			$ 650
Number of Properties (in properties) | property			1
Gain on sale of real estate			$ 31
Loss on Impairment of Real Estate			$ 0
Memphis, TN | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Rentable Square Feet | ft²			205
Gross Sales Price			$ 15,270
Number of Properties (in properties) | property			1
Gain on sale of real estate			$ 287
Loss on Impairment of Real Estate			$ 0
Stoneham, MA | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Rentable Square Feet | ft²			98
Gross Sales Price			$ 6,650
Number of Properties (in properties) | property			1
Gain on sale of real estate			$ (282)
Loss on Impairment of Real Estate			$ 5,911
Sterling, VA | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of Land Parcels | parcel_of_land			2
Rentable Square Feet | ft²			0
Gross Sales Price			$ 28,500
Number of Properties (in properties) | property			0
Gain on sale of real estate			$ 24,200
Loss on Impairment of Real Estate			$ 0
Rockville, MD | Disposal Group, Held-for-sale, Not Discontinued Operations
Real Estate Properties [Line Items]
Number of properties (in properties) | property			1
Loss on Impairment of Real Estate			$ 6,236
Rentable Square Feet (in square feet) | ft²			129
Gross Sales Price, excluding closing costs			$ 6,750
Chesapeake, VA | Disposal Group, Held-for-sale, Not Discontinued Operations
Real Estate Properties [Line Items]
Number of properties (in properties) | property			2
Loss on Impairment of Real Estate			$ 0
Rentable Square Feet (in square feet) | ft²			172
Gross Sales Price, excluding closing costs			$ 18,945
Milwaukee, WI | Disposal Group, Held-for-sale, Not Discontinued Operations
Real Estate Properties [Line Items]
Number of properties (in properties) | property			1
Loss on Impairment of Real Estate			$ 755
Rentable Square Feet (in square feet) | ft²			29
Gross Sales Price, excluding closing costs			$ 3,850
Brookhaven, GA | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property	5	3
Loss on Impairment of Real Estate			$ 425
Gross Sales Price, excluding closing costs	$ 56,000	$ 10,658
Stafford, VA | Disposal Group, Disposed of by Sale | January 2020
Real Estate Properties [Line Items]
Number of properties (in properties) | property				2
Gain on sale of real estate				$ 4,771
Loss on Impairment of Real Estate				$ 0
Rentable Square Feet (in square feet) | ft²				65
Gross Sales Price, excluding closing costs				$ 14,063
Windsor, CT | Disposal Group, Disposed of by Sale | January 2020
Real Estate Properties [Line Items]
Number of properties (in properties) | property				1
Gain on sale of real estate				$ 314
Loss on Impairment of Real Estate				$ 0
Rentable Square Feet (in square feet) | ft²				97
Gross Sales Price, excluding closing costs				$ 7,000
Lincolnshire, IL | Disposal Group, Disposed of by Sale | February 2020
Real Estate Properties [Line Items]
Number of properties (in properties) | property				1
Gain on sale of real estate				$ 1,179
Loss on Impairment of Real Estate				$ 0
Rentable Square Feet (in square feet) | ft²				223
Gross Sales Price, excluding closing costs				$ 12,000
Trenton, NJ | Disposal Group, Disposed of by Sale | March 2020
Real Estate Properties [Line Items]
Number of properties (in properties) | property				1
Gain on sale of real estate				$ (179)
Loss on Impairment of Real Estate				$ 0	$ 9,454
Rentable Square Feet (in square feet) | ft²				267
Gross Sales Price, excluding closing costs				$ 30,100
Fairfax, VA | Disposal Group, Disposed of by Sale | March 2020
Real Estate Properties [Line Items]
Number of properties (in properties) | property				1
Gain on sale of real estate				$ 4,754
Loss on Impairment of Real Estate				$ 0
Rentable Square Feet (in square feet) | ft²				83
Gross Sales Price, excluding closing costs				$ 22,200
Fairfax, VA | Disposal Group, Disposed of by Sale | October 2020
Real Estate Properties [Line Items]
Number of properties (in properties) | property				4
Gain on sale of real estate				$ 16
Loss on Impairment of Real Estate				$ 2,954
Rentable Square Feet (in square feet) | ft²				171
Gross Sales Price, excluding closing costs				$ 25,100
Northern Virginia and Maryland | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					34
Gain on sale of real estate					$ 0
Loss on Impairment of Real Estate					$ 732
Rentable Square Feet (in square feet) | ft²					1,636
Gross Sales Price, excluding closing costs					$ 198,500
Washington, D.C. | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 22,075
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					129
Gross Sales Price, excluding closing costs					$ 70,000
Buffalo, NY | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 0
Loss on Impairment of Real Estate					$ 5,137
Rentable Square Feet (in square feet) | ft²					122
Gross Sales Price, excluding closing costs					$ 16,900
Maynard, MA | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ (227)
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					287
Gross Sales Price, excluding closing costs					$ 5,000
Kapolei, HI | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 0
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					417
Gross Sales Price, excluding closing costs					$ 7,100
San Jose, CA | Disposal Group, Disposed of by Sale | July 2019
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ (270)
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					72
Gross Sales Price, excluding closing costs					$ 14,000
San Jose, CA | Disposal Group, Disposed of by Sale | December 2019
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ (333)
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					76
Gross Sales Price, excluding closing costs					$ 13,000
Nashua, NH | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 8,401
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					322
Gross Sales Price, excluding closing costs					$ 25,000
Arlington, TX | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 187
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					182
Gross Sales Price, excluding closing costs					$ 14,900
Rochester, NY | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ (104)
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					95
Gross Sales Price, excluding closing costs					$ 4,765
Hanover, PA | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ (417)
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					502
Gross Sales Price, excluding closing costs					$ 5,500
San Antonio, TX | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 3,869
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					618
Gross Sales Price, excluding closing costs					$ 198,000
Topeka, KS | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 36
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					144
Gross Sales Price, excluding closing costs					$ 15,600
Falling Waters, WV | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 0
Loss on Impairment of Real Estate					$ 2,179
Rentable Square Feet (in square feet) | ft²					40
Gross Sales Price, excluding closing costs					$ 650
San Diego, CA | Disposal Group, Disposed of by Sale | September 2019
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 3,062
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					44
Gross Sales Price, excluding closing costs					$ 8,950
San Diego, CA | Disposal Group, Disposed of by Sale | December 2019
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 6,823
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					148
Gross Sales Price, excluding closing costs					$ 23,750
Columbia, SC | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					3
Gain on sale of real estate					$ 0
Loss on Impairment of Real Estate					$ 3,581
Rentable Square Feet (in square feet) | ft²					181
Gross Sales Price, excluding closing costs					$ 10,750
Metro DC - MD | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					3
Gain on sale of real estate					$ 1,177
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					373
Gross Sales Price, excluding closing costs					$ 61,938
Phoenix, AZ | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 860
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					123
Gross Sales Price, excluding closing costs					$ 12,850
Houston, TX | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 59,992
Loss on Impairment of Real Estate					$ 0
Rentable Square Feet (in square feet) | ft²					497
Gross Sales Price, excluding closing costs					$ 130,000
Kansas City, KS | Disposal Group, Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties (in properties) | property					1
Gain on sale of real estate					$ 0
Loss on Impairment of Real Estate					$ 1,172
Rentable Square Feet (in square feet) | ft²					171
Gross Sales Price, excluding closing costs					$ 11,700

Real Estate Properties - Uncons

Real Estate Properties - Unconsolidated Joint Ventures (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)ft²joint_ventureproperty	Dec. 31, 2020USD ($)ft²
Real Estate [Line Items]
Number of joint ventures | joint_venture	2
Number of properties (in properties) | property	178
Rentable Square Feet (in square feet) | ft²	926	163
Unconsolidated Joint Ventures
Real Estate [Line Items]
Number of joint ventures | joint_venture	2
Number of properties (in properties) | property	3
OPI Carrying Value of Investments	$ 34,838	$ 37,951
Rentable Square Feet (in square feet) | ft²	444
Equity method investment, difference between carrying amount and underlying equity	$ 6,977
Unconsolidated Joint Ventures | Mortgage Note Payable
Real Estate [Line Items]
Interest rate (as a percent)	3.93%
Principal balance	$ 82,000	82,000
Unconsolidated Joint Ventures | Prosperity Metro Plaza
Real Estate [Line Items]
Number of properties (in properties) | property	2
OPI Ownership	51.00%
OPI Carrying Value of Investments	$ 20,672	21,888
Rentable Square Feet (in square feet) | ft²	329
Unconsolidated Joint Ventures | Prosperity Metro Plaza | Mortgage Note Payable
Real Estate [Line Items]
Interest rate (as a percent)	4.09%
Principal balance	$ 50,000	50,000
Unconsolidated Joint Ventures | 1750 H Street, NW
Real Estate [Line Items]
Number of properties (in properties) | property	1
OPI Ownership	50.00%
OPI Carrying Value of Investments	$ 14,166	16,063
Rentable Square Feet (in square feet) | ft²	115
Unconsolidated Joint Ventures | 1750 H Street, NW | Mortgage Note Payable
Real Estate [Line Items]
Interest rate (as a percent)	3.69%
Principal balance	$ 32,000	$ 32,000

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)tenant	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Straight line rent adjustments	$ 15,368	$ 16,079	$ 27,507
Straight line rent receivables	82,978	68,824
Variable lease, income	85,107	75,851	91,076
Tenant reimbursement income	81,295	71,385	86,353
Right-of-use asset		168
Operating lease, liability		174
Lease expense	79	$ 1,749	$ 1,670
Operating Lease, Liability, Statement of Financial Position [Extensible List]		Accounts payable and other liabilities
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Other assets, net
COVID-19 Pandemic
Lessee, Lease, Description [Line Items]
Temporary rental assistance	$ 2,483
Number of tenants granted rent assistance | tenant	18
Deferred payment plan period	12 months
Lessor, Operating Lease, Payment to be Received
Lessee, Lease, Description [Line Items]
Number of government tenants with the right to terminate their leases | tenant	14
Tenant with Exercisable Termination Rights | Lessor, Operating Lease, Payment to be Received | Tenant Concentration
Lessee, Lease, Description [Line Items]
Concentration risk, percentage	2.80%
2022	1.50%
2023	8.80%
2024	3.00%
2025	6.20%
2026	2.40%
2027	1.70%
2028	2.50%
2029	1.70%
2030	1.60%
2035	1.70%
2040	1.10%
Fourteen Government Tenants | Lessor, Operating Lease, Payment to be Received | Tenant Concentration
Lessee, Lease, Description [Line Items]
Concentration risk, percentage	6.20%

Leases - Operating Lease Maturi

Leases - Operating Lease Maturity (Details) $ in Thousands	Dec. 31, 2021USD ($)
Leases [Abstract]
2022	$ 456,350
2023	422,139
2024	360,282
2025	296,945
2026	253,313
Thereafter	1,267,710
Total	$ 3,056,739

Business and Property Managem_2

Business and Property Management Agreements with RMR LLC (Details) - RMR LLC $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2019USD ($)	Dec. 31, 2021USD ($)agreementemployee	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Related Party Transaction [Line Items]
Number of employees | employee		0
Number of agreements with RMR LLC to provide management services | agreement		2
Net business management fees			$ 17,358	$ 21,320
Recognized amortization of the liability		$ 603	603	603
Management fees as percentage of gross collected rents		3.00%
Construction supervision fees as percentage of construction costs		5.00%
Reimbursement amounts		$ 24,766	24,919	26,442
Net Property Management and Construction Supervision Fees
Related Party Transaction [Line Items]
Net business management fees		18,637
Transaction amount		21,103	20,774	21,911
Reimbursement amounts		484	484	484
Net Property Management and Construction Supervision Fees | Investment Building and Building Improvements
Related Party Transaction [Line Items]
Transaction amount		4,596	3,446	2,591
Net Property Management and Construction Supervision Fees | Other Operating Income (Expense)
Related Party Transaction [Line Items]
Transaction amount		$ 16,507	$ 17,328	$ 19,320
Transition Services
Related Party Transaction [Line Items]
Duration of transition services		120 days
Amended And Restate Business Management Agreement
Related Party Transaction [Line Items]
Percentage applied on average historical cost of real estate investment properties acquired		0.50%
Base management fee payable as percentage of average historical cost of real estate investments		0.70%
Percentage of average closing stock price on stock exchange		0.70%
Management fee payable as percentage of average market capitalization exceeding specified amount		0.50%
Percentage for limitation and adjustments of incentive management fee payable		12.00%
Measurement period for incentive management fee		3 years
Average closing price of our common shares, consecutive trading days		10 days
Highest average closing price of our common shares, final consecutive trading days		30 days
Percentage for limitation and adjustments of incentive management fee payable, minimum total return per share percentage change		5.00%
Percentage of base business management fee payable in common shares		1.50%
Amended And Restate Business Management Agreement | Up C Transaction
Related Party Transaction [Line Items]
Written notice for convenience		60 days
Window of written notice after calendar year		60 days
Window for written notice after change of control		12 months
Remaining termination fee term		10 years
Maximum | Amended And Restate Business Management Agreement
Related Party Transaction [Line Items]
Threshold amount of real estate investments		$ 250,000
Threshold amount of average market capitalization		$ 250,000
Percentage for limitation and adjustments of incentive management fee payable, total return per share percentage, reduction		5.00%
Maximum | Amended And Restate Business Management Agreement | Up C Transaction
Related Party Transaction [Line Items]
Termination fee term		20 years
Minimum | Amended And Restate Business Management Agreement
Related Party Transaction [Line Items]
Threshold amount of real estate investments		$ 250,000
Base management fee payable average market capitalization		$ 250,000
Percentage for limitation and adjustments of incentive management fee payable, total return per share percentage, reduction		2.00%
Minimum | Amended And Restate Business Management Agreement | Up C Transaction
Related Party Transaction [Line Items]
Termination fee term		19 years
SIR | Business Management Incentive Fee
Related Party Transaction [Line Items]
Transaction amount	$ 25,817

Related Person Transactions (De

Related Person Transactions (Details) $ / shares in Units, ft² in Thousands, $ in Thousands	Jul. 01, 2019USD ($)$ / sharesshares	Dec. 31, 2021USD ($)ft²	Jun. 30, 2021USD ($)ft²renewal_option	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2021USD ($)ft²agreement	Dec. 31, 2020USD ($)ft²	Dec. 31, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2023USD ($)
Related Party Transaction [Line Items]
Rentable Square Feet (in square feet) | ft²		926				926	163
Equity in net losses of investees						$ (2,501)	$ (1,193)	$ (1,259)
RMR LLC
Related Party Transaction [Line Items]
Number of agreements with RMR LLC to provide management services | agreement						2
Rental income earned						$ 1,138	1,120	1,142
Related party transaction							17,358	21,320
AIC
Related Party Transaction [Line Items]
Related party transaction									$ 1,211
Distribution of earnings from Affiliates Insurance Company		$ 11		$ 287	$ 9,000
Amount invested in equity investee							$ 11
Equity in unrealized gain (loss) of investees								281
Equity in net losses of investees								$ 90
Sonesta International Hotels Corporation
Related Party Transaction [Line Items]
Lessor, Operating Lease, Lease Not yet Commenced, Term of Contract			30 years
Rentable Square Feet (in square feet) | ft²			230
Percentage upon completion of redevelopment			54.00%
Number of renewal options | renewal_option			2
Renewal term			10 years
Annual base rent			$ 6,436
Deferred payment plan period			18 months
Annual percentage increase			10.00%
Annual base rent increase			5 years
Sonesta International Hotels Corporation | Forecast
Related Party Transaction [Line Items]
Purchase price										$ 66,000
SIR
Related Party Transaction [Line Items]
Related party transaction									$ 1,666
IPO | RMR Inc
Related Party Transaction [Line Items]
Number of shares sold (in shares) | shares	2,801,060
Sale of stock (in dollars per share) | $ / shares	$ 40
Sale of stock, consideration received on transaction	$ 104,674
Officers and Other Employees | Common Shares | 2009 Award Plan
Related Party Transaction [Line Items]
Award vesting period						4 years
Officers and Other Employees | Share-based Payment Arrangement, Tranche 1 | Common Shares | 2009 Award Plan
Related Party Transaction [Line Items]
Award vesting rights, percentage						20.00%
Officers and Other Employees | Share-based Payment Arrangement, Tranche 2 | Common Shares | 2009 Award Plan
Related Party Transaction [Line Items]
Award vesting rights, percentage						20.00%
Officers and Other Employees | Share-based Payment Arrangement, Tranche 3 | Common Shares | 2009 Award Plan
Related Party Transaction [Line Items]
Award vesting rights, percentage						20.00%
Officers and Other Employees | Share-based Compensation Award, Tranche 4 | Common Shares | 2009 Award Plan
Related Party Transaction [Line Items]
Award vesting rights, percentage						20.00%
Officers and Other Employees | Share-based Compensation Award, Tranche 5 | Common Shares | 2009 Award Plan
Related Party Transaction [Line Items]
Award vesting rights, percentage						20.00%

Concentration (Details)

Concentration (Details)	12 Months Ended
	Dec. 31, 2021propertygovernment_tenantstate_government	Dec. 31, 2020state_governmentgovernment_tenant	Dec. 31, 2019government_tenantstate_government
Concentration Risk [Line Items]
Number of other governments | government_tenant	4	2	2
Number of properties (in properties)	178
Number of states in which acquired properties located	33
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Tenant Concentration | U S Government, State Governments, and Other Governments
Concentration Risk [Line Items]
Number of state governments | state_government	11	11	11
Concentration risk, percentage	28.90%	35.30%	35.50%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Tenant Concentration | U.S. Government
Concentration Risk [Line Items]
Concentration risk, percentage	19.50%	25.20%	25.00%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Geographic Concentration Risk | Virginia
Concentration Risk [Line Items]
Concentration risk, percentage	12.40%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Geographic Concentration Risk | California
Concentration Risk [Line Items]
Concentration risk, percentage	10.50%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Geographic Concentration Risk | Washington, D.C.
Concentration Risk [Line Items]
Concentration risk, percentage	9.80%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Geographic Concentration Risk | Illinois
Concentration Risk [Line Items]
Concentration risk, percentage	9.20%
Annualized Rental Income, Excluding Properties Classified as Discontinued Operations | Geographic Concentration Risk | Georgia
Concentration Risk [Line Items]
Concentration risk, percentage	8.20%

Indebtedness - Outstanding Debt

Indebtedness - Outstanding Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021	Aug. 31, 2021	May 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long term debt gross	$ 2,610,301				$ 2,242,842
Unamortized debt premiums, discounts and issuance costs	(32,351)				(39,871)
Total debt	$ 2,577,950				2,202,971
Senior Unsecured Notes | Senior unsecured notes, 4.150% interest rate, due in 2022
Debt Instrument [Line Items]
Interest rate (as a percent)	4.15%	4.15%
Long term debt gross	$ 0				300,000
Senior Unsecured Notes | Senior unsecured notes, 4.00% interest rate, due in 2022
Debt Instrument [Line Items]
Interest rate (as a percent)	4.00%
Long term debt gross	$ 300,000				300,000
Senior Unsecured Notes | Senior unsecured notes, 4.25% interest rate, due in 2024
Debt Instrument [Line Items]
Interest rate (as a percent)	4.25%
Long term debt gross	$ 350,000				350,000
Senior Unsecured Notes | Senior unsecured notes, 4.50% interest rate, due in 2025
Debt Instrument [Line Items]
Long term debt gross	$ 650,000				650,000
Senior Unsecured Notes | Senior unsecured notes, 2.650% interest rate, due in 2026
Debt Instrument [Line Items]
Interest rate (as a percent)	2.65%			2.65%
Long term debt gross	$ 300,000				0
Senior Unsecured Notes | Senior unsecured notes, 2.400% interest rate, due in 2027
Debt Instrument [Line Items]
Interest rate (as a percent)	2.40%		2.40%
Long term debt gross	$ 350,000				0
Senior Unsecured Notes | Senior unsecured notes, 3.450% interest rate, due in 2031
Debt Instrument [Line Items]
Interest rate (as a percent)	3.45%	3.45%
Long term debt gross	$ 400,000				0
Senior Unsecured Notes | Senior unsecured notes, 5.875% interest rate, due in 2046
Debt Instrument [Line Items]
Interest rate (as a percent)	5.875%
Long term debt gross	$ 0				310,000
Senior Unsecured Notes | Senior unsecured notes, 6.375% interest rate, due in 2050
Debt Instrument [Line Items]
Interest rate (as a percent)	6.375%
Long term debt gross	$ 162,000				162,000
Mortgage Note Payable | Mortgage note payable, 8.150% interest rate, due in 2021
Debt Instrument [Line Items]
Interest rate (as a percent)	8.15%
Long term debt gross	$ 0				350
Mortgage Note Payable | Mortgage note payable, 4.220% interest rate, due in 2022
Debt Instrument [Line Items]
Interest rate (as a percent)	4.22%
Long term debt gross	$ 25,055				25,804
Mortgage Note Payable | Mortgage note payable, 3.550% interest rate, due in 2023
Debt Instrument [Line Items]
Interest rate (as a percent)	3.55%
Long term debt gross	$ 0				71,000
Mortgage Note Payable | Mortgage note payable, 3.700% interest rate, due in 2023
Debt Instrument [Line Items]
Interest rate (as a percent)	3.70%
Long term debt gross	$ 50,000				50,000
Mortgage Note Payable | Mortgage note payable, 4.800% interest rate, due in 2023
Debt Instrument [Line Items]
Interest rate (as a percent)	4.80%
Long term debt gross	$ 23,246				23,688
Revolving credit facility, due in 2023 | Line of Credit
Debt Instrument [Line Items]
Long term debt gross	$ 0				$ 0

Indebtedness - Narrative (Detai

Indebtedness - Narrative (Details) $ in Thousands	1 Months Ended				12 Months Ended
	Sep. 30, 2021USD ($)	Aug. 31, 2021USD ($)	Jun. 30, 2021USD ($)property	May 31, 2021USD ($)	Dec. 31, 2021USD ($)propertyextensionOption	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Feb. 15, 2022USD ($)
Debt Instrument [Line Items]
Principal of properties collateralized					$ 98,301
Borrowings outstanding					0	$ 0
Loss on early extinguishment of debt					$ 14,068	$ 3,839	$ 769
Number of buildings collateralized | property			3		3
Book value of properties collateralized					$ 188,130
Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity on revolving credit facility					750,000
Principal of properties collateralized					$ 1,950,000
Number of contingent options to extend | extensionOption					2
Contingent option to extend maturity date					6 months
Commitment fee percentage					0.25%
Interest rate (as a percent)					1.20%	1.20%
Weighted average annual interest rate					1.20%	2.00%	3.30%
Borrowings outstanding					$ 0
Available borrowings					$ 750,000
Unsecured Revolving Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Borrowings outstanding								$ 0
Available borrowings								$ 750,000
LIBOR | Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate premium (as a percent)					1.10%
Senior Unsecured Notes | Senior unsecured notes, 2.650% interest rate, due in 2026
Debt Instrument [Line Items]
Interest rate (as a percent)				2.65%	2.65%
Principal balance				$ 300,000
Proceeds from issuance of long-term debt				$ 296,826
Senior Unsecured Notes | Senior unsecured notes, 2.400% interest rate, due in 2027
Debt Instrument [Line Items]
Interest rate (as a percent)		2.40%			2.40%
Principal balance		$ 350,000
Proceeds from issuance of long-term debt		$ 346,607
Senior Unsecured Notes | Senior unsecured notes, 3.450% interest rate, due in 2031
Debt Instrument [Line Items]
Interest rate (as a percent)	3.45%				3.45%
Principal balance	$ 400,000
Proceeds from issuance of long-term debt	$ 395,632
Senior Unsecured Notes | Senior Unsecured Notes 5.875 Percent Due 2046
Debt Instrument [Line Items]
Interest rate (as a percent)			5.875%
Repurchased face amount			$ 310,000
Loss on early extinguishment of debt					$ 8,581
Senior Unsecured Notes | Senior unsecured notes, 4.150% interest rate, due in 2022
Debt Instrument [Line Items]
Interest rate (as a percent)	4.15%				4.15%
Repurchased face amount	$ 300,000
Loss on early extinguishment of debt					$ 2,274
Mortgage Note Payable | Mortgage Notes Payable Due May 2023, 3.55%
Debt Instrument [Line Items]
Interest rate (as a percent)			3.55%
Repayments of debt			$ 71,000
Loss on early extinguishment of debt					$ 3,213

Indebtedness - Future Principal

Indebtedness - Future Principal Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
2022	$ 325,517
2023	72,784
2024	350,000
2025	650,000
2026	300,000
Thereafter	912,000
Total	2,610,301	$ 2,242,842
Long term debt gross	2,610,301	2,242,842
Unamortized debt premiums, discounts and issuance	32,351	39,871
Total debt outstanding	2,577,950	2,202,971
Mortgage note payable, 4.220% interest rate, due in 2022 | Mortgage Note Payable
Debt Instrument [Line Items]
Total	25,055	25,804
Long term debt gross	$ 25,055	$ 25,804
Interest rate (as a percent)	4.22%

Fair Value of Assets and Liab_3

Fair Value of Assets and Liabilities - Asset Measured at Fair Value (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)property
Fair Value, Nonrecurring
Fair Value of Assets and Liabilities
Other liability	$ 10,600
Fair Value, Nonrecurring | Level 1 inputs
Fair Value of Assets and Liabilities
Other liability	0
Fair Value, Nonrecurring | Level 2 inputs
Fair Value of Assets and Liabilities
Other liability	10,600
Fair Value, Nonrecurring | Level 3 inputs
Fair Value of Assets and Liabilities
Other liability	0
Disposal Group, Held-for-sale, Not Discontinued Operations | Level 3 inputs
Fair Value of Assets and Liabilities
Impairment charges	$ 6,991
Number of impaired properties | property	2
Costs to sell	$ 555

Fair Value of Assets and Liab_4

Fair Value of Assets and Liabilities - Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021	Aug. 31, 2021	May 31, 2021	Dec. 31, 2020
Fair Value of Financial Instruments
Senior notes	$ 2,479,772				$ 2,033,242
Mortgage notes payable	98,178				169,729
Unamortized debt premiums, discounts and issuance	32,351				39,871
Carrying Amount
Fair Value of Financial Instruments
Fair value of debt	2,577,950				2,202,971
Carrying Amount | Mortgage Note Payable
Fair Value of Financial Instruments
Mortgage notes payable	98,178				169,729
Fair Value
Fair Value of Financial Instruments
Fair value of debt	2,661,462				2,335,352
Fair Value | Mortgage Note Payable
Fair Value of Financial Instruments
Mortgage notes payable	100,294				174,952
Senior Notes and Mortgages
Fair Value of Financial Instruments
Unamortized debt premiums, discounts and issuance	$ 32,351				39,871
Senior Unsecured Notes | Senior unsecured notes, 4.150% interest rate, due in 2022
Fair Value of Financial Instruments
Interest rate (as a percent)	4.15%	4.15%
Senior Unsecured Notes | Senior unsecured notes, 4.00% interest rate, due in 2022
Fair Value of Financial Instruments
Interest rate (as a percent)	4.00%
Senior Unsecured Notes | Senior unsecured notes, 4.25% interest rate, due in 2024
Fair Value of Financial Instruments
Interest rate (as a percent)	4.25%
Senior Unsecured Notes | Senior unsecured notes, 4.50% interest rate, due in 2025
Fair Value of Financial Instruments
Interest rate (as a percent)	4.50%
Senior Unsecured Notes | Senior unsecured notes, 2.650% interest rate, due in 2026
Fair Value of Financial Instruments
Interest rate (as a percent)	2.65%			2.65%
Senior Unsecured Notes | Senior unsecured notes, 2.400% interest rate, due in 2027
Fair Value of Financial Instruments
Interest rate (as a percent)	2.40%		2.40%
Senior Unsecured Notes | Senior unsecured notes, 3.450% interest rate, due in 2031
Fair Value of Financial Instruments
Interest rate (as a percent)	3.45%	3.45%
Senior Unsecured Notes | Senior unsecured notes, 5.875% interest rate, due in 2046
Fair Value of Financial Instruments
Interest rate (as a percent)	5.875%
Senior Unsecured Notes | Carrying Amount | Senior unsecured notes, 4.150% interest rate, due in 2022
Fair Value of Financial Instruments
Senior notes	$ 0				298,853
Senior Unsecured Notes | Carrying Amount | Senior unsecured notes, 4.00% interest rate, due in 2022
Fair Value of Financial Instruments
Senior notes	299,500				298,579
Senior Unsecured Notes | Carrying Amount | Senior unsecured notes, 4.25% interest rate, due in 2024
Fair Value of Financial Instruments
Senior notes	344,581				342,299
Senior Unsecured Notes | Carrying Amount | Senior unsecured notes, 4.50% interest rate, due in 2025
Fair Value of Financial Instruments
Senior notes	639,370				635,921
Senior Unsecured Notes | Carrying Amount | Senior unsecured notes, 2.650% interest rate, due in 2026
Fair Value of Financial Instruments
Senior notes	297,213				0
Senior Unsecured Notes | Carrying Amount | Senior unsecured notes, 2.400% interest rate, due in 2027
Fair Value of Financial Instruments
Senior notes	346,845				0
Senior Unsecured Notes | Carrying Amount | Senior unsecured notes, 3.450% interest rate, due in 2031
Fair Value of Financial Instruments
Senior notes	395,744				0
Senior Unsecured Notes | Carrying Amount | Senior unsecured notes, 5.875% interest rate, due in 2046
Fair Value of Financial Instruments
Senior notes	0				301,264
Senior Unsecured Notes | Carrying Amount | Senior unsecured notes, 6.375% interest rate, due in 2050
Fair Value of Financial Instruments
Senior notes	156,519				156,326
Senior Unsecured Notes | Fair Value | Senior unsecured notes, 4.150% interest rate, due in 2022
Fair Value of Financial Instruments
Senior notes	0				306,192
Senior Unsecured Notes | Fair Value | Senior unsecured notes, 4.00% interest rate, due in 2022
Fair Value of Financial Instruments
Senior notes	304,148				306,756
Senior Unsecured Notes | Fair Value | Senior unsecured notes, 4.25% interest rate, due in 2024
Fair Value of Financial Instruments
Senior notes	365,449				365,435
Senior Unsecured Notes | Fair Value | Senior unsecured notes, 4.50% interest rate, due in 2025
Fair Value of Financial Instruments
Senior notes	687,749				688,399
Senior Unsecured Notes | Fair Value | Senior unsecured notes, 2.650% interest rate, due in 2026
Fair Value of Financial Instruments
Senior notes	298,502				0
Senior Unsecured Notes | Fair Value | Senior unsecured notes, 2.400% interest rate, due in 2027
Fair Value of Financial Instruments
Senior notes	339,764				0
Senior Unsecured Notes | Fair Value | Senior unsecured notes, 3.450% interest rate, due in 2031
Fair Value of Financial Instruments
Senior notes	388,458				0
Senior Unsecured Notes | Fair Value | Senior unsecured notes, 5.875% interest rate, due in 2046
Fair Value of Financial Instruments
Senior notes	0				322,028
Senior Unsecured Notes | Fair Value | Senior unsecured notes, 6.375% interest rate, due in 2050
Fair Value of Financial Instruments
Senior notes	$ 177,098				$ 171,590

Shareholders' Equity - Share Aw

Shareholders' Equity - Share Awards (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)trusteeinstallmentshares	Dec. 31, 2020USD ($)trusteeshares	Dec. 31, 2019USD ($)trusteeshares	Dec. 31, 2018shares
Officers and Other Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of shares, net (in shares)	117,800	108,600	103,100
Issuance of shares, net | $	$ 2,994	$ 2,502	$ 3,080
2009 Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	145,800	136,600	136,100
Number of installments | installment	5
Unvested shares (in shares)	182,224	157,521	106,680	55,321
2022 (in shares)	60,184
2023 (in shares)	56,900
2024 (in shares)	41,580
2025 (in shares)	23,560
Estimated future compensation expense for the unvested shares | $	$ 4,279
Weighted average period of recognition of compensation expenses (in years)	23 months
Compensation expense | $	$ 2,868	$ 3,315	$ 3,088
Shares available for issuance under plan (in shares)	987,610
2009 Award Plan | Trustees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of trustees | trustee	8	8	8
Shares granted (in shares)	3,500	3,500	3,000
Aggregate market value of shares awarded | $	$ 837	$ 745	$ 575
Market value of common shares awarded to each trustee (in dollars) | $	$ 105	$ 93	$ 72
2009 Award Plan | Managing Trustee | Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of trustees | trustee			3
Shares granted (in shares)			3,000
Aggregate market value of shares awarded | $			$ 270
Market value of common shares awarded to each trustee (in dollars) | $			$ 90

Shareholders' Equity - Unvested

Shareholders' Equity - Unvested Shares Activity (Details) - 2009 Award Plan - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of Shares
Unvested at the beginning of the period (in shares)	157,521	106,680	55,321
Granted (in shares)	145,800	136,600	136,100
Forfeited (in shares)	(700)	(586)	(1,474)
Vested (in shares)	(120,397)	(85,173)	(83,267)
Unvested at the end of the period (in shares)	182,224	157,521	106,680
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share)	$ 29.26	$ 40.16	$ 73.25
Granted (in dollars per share)	26.28	23.77	28.84
Forfeited (in dollars per share)	25.97	43.75	49.10
Vested (in dollars per share)	30.24	34.02	27.78
Unvested at the end of the period (in dollars per share)	$ 26.23	$ 29.26	$ 40.16

Shareholders' Equity - Share Re

Shareholders' Equity - Share Repurchases/Sale of Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 13, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Share repurchases (in shares)		37,801	19,589	15,588
Stock repurchase price (in dollars per share)		$ 26.55	$ 22.15	$ 29.76
Subsequent Event
Class of Stock [Line Items]
Common distributions declared (in dollars per share)	$ 0.55
Dividends payable	$ 26,600

Shareholders' Equity - Distribu

Shareholders' Equity - Distribution (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Annual Per Share Distribution (in dollars per share)	$ 2.20	$ 2.20	$ 2.20
Total Distributions	$ 106,368	$ 106,121	$ 105,868
Characterization of Distribution, Return of Capital	0.00%	0.00%	0.00%
Characterization of Distribution, Ordinary Income	100.00%	100.00%	100.00%
Characterization of Distribution, Quality Dividend	0.00%	0.00%	0.00%

SCHEDULE III REAL ESTATE AND _2

SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)propertybuilding	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Real estate and accumulated depreciation
Number of Properties | property	174
Encumbrances	$ 98,178
Initial Cost to Company
Land	875,529
Buildings and Equipment	2,658,896
Costs Capitalized Subsequent to Acquisition	388,903
Impairment/ Writedowns	(12,242)
Cost amount carried at Close of Period
Land	874,108
Buildings and Equipment	3,036,978
Total	3,911,086	$ 3,522,143	$ 3,493,231	$ 3,944,636
Accumulated Depreciation	$ (495,912)	$ (451,914)	$ (387,656)	$ (375,147)
Inverness Center, Birmingham, AL
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 5,907
Buildings and Equipment	12,098
Costs Capitalized Subsequent to Acquisition	1,590
Impairment/ Writedowns	(7,717)
Cost amount carried at Close of Period
Land	3,823
Buildings and Equipment	8,055
Total	11,878
Accumulated Depreciation	$ 0
445 Jan Davis Drive, Huntsville, AL
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,501
Buildings and Equipment	1,492
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	1,501
Buildings and Equipment	1,492
Total	2,993
Accumulated Depreciation	$ (120)
131 Clayton Street, Montgomery, AL
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 920
Buildings and Equipment	9,084
Costs Capitalized Subsequent to Acquisition	241
Cost amount carried at Close of Period
Land	920
Buildings and Equipment	9,325
Total	10,245
Accumulated Depreciation	$ (2,438)
4344 Carmichael Road, Montgomery, AL
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,374
Buildings and Equipment	11,658
Costs Capitalized Subsequent to Acquisition	562
Cost amount carried at Close of Period
Land	1,374
Buildings and Equipment	12,220
Total	13,594
Accumulated Depreciation	$ (2,424)
15451 North 28th Avenue, Phoenix, AZ
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,917
Buildings and Equipment	7,416
Costs Capitalized Subsequent to Acquisition	752
Cost amount carried at Close of Period
Land	1,917
Buildings and Equipment	8,168
Total	10,085
Accumulated Depreciation	$ (1,518)
16001 North 28th Ave, Phoenix, AZ
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 3,355
Buildings and Equipment	412
Costs Capitalized Subsequent to Acquisition	1,123
Cost amount carried at Close of Period
Land	3,355
Buildings and Equipment	1,535
Total	4,890
Accumulated Depreciation	$ (145)
711 S 14th Ave, Safford, AZ
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 460
Buildings and Equipment	11,708
Costs Capitalized Subsequent to Acquisition	884
Impairment/ Writedowns	(4,440)
Cost amount carried at Close of Period
Land	364
Buildings and Equipment	8,248
Total	8,612
Accumulated Depreciation	$ (1,058)
Regents Center, Tempe, AZ
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 4,121
Buildings and Equipment	3,042
Costs Capitalized Subsequent to Acquisition	293
Cost amount carried at Close of Period
Land	4,121
Buildings and Equipment	3,335
Total	7,456
Accumulated Depreciation	$ (480)
Campbell Place, Carlsbad, CA
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 5,769
Buildings and Equipment	3,871
Costs Capitalized Subsequent to Acquisition	7,481
Cost amount carried at Close of Period
Land	5,769
Buildings and Equipment	11,352
Total	17,121
Accumulated Depreciation	$ (1,476)
Folsom Corporate Center, Folsom, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 2,904
Buildings and Equipment	5,583
Costs Capitalized Subsequent to Acquisition	568
Cost amount carried at Close of Period
Land	2,904
Buildings and Equipment	6,151
Total	9,055
Accumulated Depreciation	$ (585)
Bayside Technology Park, Fremont, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 10,784
Buildings and Equipment	648
Costs Capitalized Subsequent to Acquisition	87
Cost amount carried at Close of Period
Land	10,784
Buildings and Equipment	735
Total	11,519
Accumulated Depreciation	$ (75)
10949 N. Mather Boulevard, Rancho Cordova, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 562
Buildings and Equipment	16,923
Costs Capitalized Subsequent to Acquisition	992
Cost amount carried at Close of Period
Land	562
Buildings and Equipment	17,915
Total	18,477
Accumulated Depreciation	$ (3,658)
11020 Sun Center Drive, Rancho Cordova, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,466
Buildings and Equipment	8,797
Costs Capitalized Subsequent to Acquisition	1,409
Cost amount carried at Close of Period
Land	1,466
Buildings and Equipment	10,206
Total	11,672
Accumulated Depreciation	$ (1,486)
100 Redwood Shores Parkway, Redwood City, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 14,454
Buildings and Equipment	7,721
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	14,454
Buildings and Equipment	7,721
Total	22,175
Accumulated Depreciation	$ (643)
3875 Atherton Road, Rocklin, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 177
Buildings and Equipment	853
Costs Capitalized Subsequent to Acquisition	9
Cost amount carried at Close of Period
Land	177
Buildings and Equipment	862
Total	1,039
Accumulated Depreciation	$ (71)
801 K Street, Sacramento, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,688
Buildings and Equipment	61,994
Costs Capitalized Subsequent to Acquisition	7,078
Cost amount carried at Close of Period
Land	4,688
Buildings and Equipment	69,072
Total	73,760
Accumulated Depreciation	$ (10,724)
9815 Goethe Road, Sacramento, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,450
Buildings and Equipment	9,465
Costs Capitalized Subsequent to Acquisition	1,494
Cost amount carried at Close of Period
Land	1,450
Buildings and Equipment	10,959
Total	12,409
Accumulated Depreciation	$ (2,821)
Capitol Place, Sacramento, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 2,290
Buildings and Equipment	35,891
Costs Capitalized Subsequent to Acquisition	8,399
Cost amount carried at Close of Period
Land	2,290
Buildings and Equipment	44,290
Total	46,580
Accumulated Depreciation	$ (12,964)
4560 Viewridge Road, San Diego, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,269
Buildings and Equipment	18,316
Costs Capitalized Subsequent to Acquisition	5,135
Cost amount carried at Close of Period
Land	4,347
Buildings and Equipment	23,373
Total	27,720
Accumulated Depreciation	$ (13,088)
2115 O'Nel Drive, San Jose, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 12,305
Buildings and Equipment	5,062
Costs Capitalized Subsequent to Acquisition	218
Cost amount carried at Close of Period
Land	12,305
Buildings and Equipment	5,280
Total	17,585
Accumulated Depreciation	$ (421)
North First Street, San Jose, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 8,311
Buildings and Equipment	4,003
Costs Capitalized Subsequent to Acquisition	411
Cost amount carried at Close of Period
Land	8,311
Buildings and Equipment	4,414
Total	12,725
Accumulated Depreciation	$ (417)
Rio Robles Drive, San Jose, CA
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 23,687
Buildings and Equipment	13,698
Costs Capitalized Subsequent to Acquisition	3,196
Cost amount carried at Close of Period
Land	23,687
Buildings and Equipment	16,894
Total	40,581
Accumulated Depreciation	$ (1,611)
2450 and 2500 Walsh Avenue, Santa Clara, CA
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 13,374
Buildings and Equipment	16,651
Costs Capitalized Subsequent to Acquisition	161
Cost amount carried at Close of Period
Land	13,374
Buildings and Equipment	16,812
Total	30,186
Accumulated Depreciation	$ (1,401)
3250 and 3260 Jay Street, Santa Clara, CA
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 19,899
Buildings and Equipment	14,051
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	19,899
Buildings and Equipment	14,051
Total	33,950
Accumulated Depreciation	$ (1,168)
603 San Juan Avenue, Stockton, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 563
Buildings and Equipment	5,470
Costs Capitalized Subsequent to Acquisition	49
Cost amount carried at Close of Period
Land	563
Buildings and Equipment	5,519
Total	6,082
Accumulated Depreciation	$ (1,288)
350 West Java Drive, Sunnyvale, CA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 24,609
Buildings and Equipment	462
Costs Capitalized Subsequent to Acquisition	322
Cost amount carried at Close of Period
Land	24,609
Buildings and Equipment	784
Total	25,393
Accumulated Depreciation	$ (48)
7958 South Chester Street, Centennial, CO
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 6,682
Buildings and Equipment	7,153
Costs Capitalized Subsequent to Acquisition	812
Cost amount carried at Close of Period
Land	6,682
Buildings and Equipment	7,965
Total	14,647
Accumulated Depreciation	$ (651)
350 Spectrum Loop, Colorado Springs, CO
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 3,650
Buildings and Equipment	7,732
Costs Capitalized Subsequent to Acquisition	503
Cost amount carried at Close of Period
Land	3,650
Buildings and Equipment	8,235
Total	11,885
Accumulated Depreciation	$ (665)
333 Inverness Drive South, Englewood, CO
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 5,711
Buildings and Equipment	4,543
Costs Capitalized Subsequent to Acquisition	63
Cost amount carried at Close of Period
Land	5,711
Buildings and Equipment	4,606
Total	10,317
Accumulated Depreciation	$ (408)
12795 West Alameda Parkway, Lakewood, CO
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 2,640
Buildings and Equipment	23,777
Costs Capitalized Subsequent to Acquisition	1,441
Cost amount carried at Close of Period
Land	2,640
Buildings and Equipment	25,218
Total	27,858
Accumulated Depreciation	$ (7,510)
Corporate Center, Lakewood, CO
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 2,887
Buildings and Equipment	27,537
Costs Capitalized Subsequent to Acquisition	4,101
Cost amount carried at Close of Period
Land	2,887
Buildings and Equipment	31,638
Total	34,525
Accumulated Depreciation	$ (15,258)
11 Dupont Circle, NW, Washington DC
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 28,255
Buildings and Equipment	44,743
Costs Capitalized Subsequent to Acquisition	15,108
Cost amount carried at Close of Period
Land	28,255
Buildings and Equipment	59,851
Total	88,106
Accumulated Depreciation	$ (7,197)
1211 Connecticut Avenue, NW, Washington DC
Real estate and accumulated depreciation
Number of Properties | property	1
Encumbrances	$ 25,059
Initial Cost to Company
Land	30,388
Buildings and Equipment	24,667
Costs Capitalized Subsequent to Acquisition	3,268
Cost amount carried at Close of Period
Land	30,388
Buildings and Equipment	27,935
Total	58,323
Accumulated Depreciation	$ (3,633)
1401 K Street, NW, Washington DC
Real estate and accumulated depreciation
Number of Properties | property	1
Encumbrances	$ 23,408
Initial Cost to Company
Land	29,215
Buildings and Equipment	34,656
Costs Capitalized Subsequent to Acquisition	6,214
Cost amount carried at Close of Period
Land	29,215
Buildings and Equipment	40,870
Total	70,085
Accumulated Depreciation	$ (6,005)
20 Massachusetts Avenue, Washington DC
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 12,009
Buildings and Equipment	51,527
Costs Capitalized Subsequent to Acquisition	72,633
Cost amount carried at Close of Period
Land	12,230
Buildings and Equipment	123,939
Total	136,169
Accumulated Depreciation	$ (40,667)
440 First Street, NW, Washington DC
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 27,903
Buildings and Equipment	38,624
Costs Capitalized Subsequent to Acquisition	2,233
Cost amount carried at Close of Period
Land	27,903
Buildings and Equipment	40,857
Total	68,760
Accumulated Depreciation	$ (4,520)
625 Indiana Avenue, Washington DC
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 26,000
Buildings and Equipment	25,955
Costs Capitalized Subsequent to Acquisition	9,818
Cost amount carried at Close of Period
Land	26,000
Buildings and Equipment	35,773
Total	61,773
Accumulated Depreciation	$ (9,746)
840 First Street, NE, Washington DC
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 42,727
Buildings and Equipment	73,278
Costs Capitalized Subsequent to Acquisition	3,546
Cost amount carried at Close of Period
Land	42,727
Buildings and Equipment	76,824
Total	119,551
Accumulated Depreciation	$ (8,758)
10350 NW 112th Avenue, Miami, FL
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,798
Buildings and Equipment	2,757
Costs Capitalized Subsequent to Acquisition	1,014
Cost amount carried at Close of Period
Land	4,798
Buildings and Equipment	3,771
Total	8,569
Accumulated Depreciation	$ (252)
7850 Southwest 6th Court, Plantation, FL
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,800
Buildings and Equipment	30,592
Costs Capitalized Subsequent to Acquisition	491
Cost amount carried at Close of Period
Land	4,800
Buildings and Equipment	31,083
Total	35,883
Accumulated Depreciation	$ (8,231)
8900 Grand Oak Circle, Tampa, FL
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,100
Buildings and Equipment	11,773
Costs Capitalized Subsequent to Acquisition	1,134
Cost amount carried at Close of Period
Land	1,100
Buildings and Equipment	12,907
Total	14,007
Accumulated Depreciation	$ (3,451)
180 Ted Turner Drive SW, Atlanta, GA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 5,717
Buildings and Equipment	20,017
Costs Capitalized Subsequent to Acquisition	632
Cost amount carried at Close of Period
Land	5,717
Buildings and Equipment	20,649
Total	26,366
Accumulated Depreciation	$ (4,824)
1224 Hammond Drive, Atlanta GA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 13,040
Buildings and Equipment	135,459
Costs Capitalized Subsequent to Acquisition	6,549
Cost amount carried at Close of Period
Land	13,040
Buildings and Equipment	142,008
Total	155,048
Accumulated Depreciation	$ (2,171)
Corporate Square, Atlanta, GA
Real estate and accumulated depreciation
Number of Properties | property	5
Initial Cost to Company
Land	$ 3,996
Buildings and Equipment	29,762
Costs Capitalized Subsequent to Acquisition	28,004
Cost amount carried at Close of Period
Land	3,996
Buildings and Equipment	57,766
Total	61,762
Accumulated Depreciation	$ (18,642)
Executive Park, Atlanta, GA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,521
Buildings and Equipment	11,826
Costs Capitalized Subsequent to Acquisition	4,123
Cost amount carried at Close of Period
Land	1,521
Buildings and Equipment	15,949
Total	17,470
Accumulated Depreciation	$ (7,759)
One Georgia Center, Atlanta, GA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 10,250
Buildings and Equipment	27,933
Costs Capitalized Subsequent to Acquisition	16,756
Cost amount carried at Close of Period
Land	10,250
Buildings and Equipment	44,689
Total	54,939
Accumulated Depreciation	$ (9,744)
One Primerica Parkway, Duluth, GA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 6,927
Buildings and Equipment	22,951
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	6,927
Buildings and Equipment	22,951
Total	29,878
Accumulated Depreciation	$ (1,908)
4712 Southpark Boulevard, Ellenwood, GA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,390
Buildings and Equipment	19,635
Costs Capitalized Subsequent to Acquisition	118
Cost amount carried at Close of Period
Land	1,390
Buildings and Equipment	19,753
Total	21,143
Accumulated Depreciation	$ (4,651)
91-209 Kuhela Street, Kapolei, HI
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,998
Buildings and Equipment	0
Costs Capitalized Subsequent to Acquisition	3
Cost amount carried at Close of Period
Land	1,992
Buildings and Equipment	9
Total	2,001
Accumulated Depreciation	$ 0
8305 NW 62nd Avenue, Johnston, IA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 2,649
Buildings and Equipment	7,997
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	2,649
Buildings and Equipment	7,997
Total	10,646
Accumulated Depreciation	$ (665)
1185, 1249 & 1387 S. Vinnell Way, Boise, ID
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 3,390
Buildings and Equipment	29,026
Costs Capitalized Subsequent to Acquisition	1,016
Cost amount carried at Close of Period
Land	3,390
Buildings and Equipment	30,042
Total	33,432
Accumulated Depreciation	$ (7,019)
2020 S. Arlington Heights, Arlington Heights, IL
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,450
Buildings and Equipment	13,588
Costs Capitalized Subsequent to Acquisition	1,672
Cost amount carried at Close of Period
Land	1,450
Buildings and Equipment	15,260
Total	16,710
Accumulated Depreciation	$ (4,204)
400 South Jefferson Street, Chicago, IL
Real estate and accumulated depreciation
Number of Properties | property	1
Encumbrances	$ 49,711
Initial Cost to Company
Land	19,379
Buildings and Equipment	20,115
Costs Capitalized Subsequent to Acquisition	779
Cost amount carried at Close of Period
Land	19,379
Buildings and Equipment	20,894
Total	40,273
Accumulated Depreciation	$ (1,744)
1000 W. Fulton, Chicago IL
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 42,935
Buildings and Equipment	258,348
Costs Capitalized Subsequent to Acquisition	50
Cost amount carried at Close of Period
Land	42,935
Buildings and Equipment	258,398
Total	301,333
Accumulated Depreciation	$ (4,473)
HUB 1415, Naperville IL
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 12,333
Buildings and Equipment	20,586
Costs Capitalized Subsequent to Acquisition	12,056
Cost amount carried at Close of Period
Land	12,333
Buildings and Equipment	32,642
Total	44,975
Accumulated Depreciation	$ (2,681)
440 North Fairway Drive, Vernon Hills, IL
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,465
Buildings and Equipment	441
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	4,465
Buildings and Equipment	441
Total	4,906
Accumulated Depreciation	$ (38)
7601 and 7635 Interactive Way, Indianapolis, IN
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 3,337
Buildings and Equipment	14,522
Costs Capitalized Subsequent to Acquisition	34
Cost amount carried at Close of Period
Land	3,337
Buildings and Equipment	14,556
Total	17,893
Accumulated Depreciation	$ (1,136)
Intech Park, Indianapolis, IN
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 4,170
Buildings and Equipment	69,759
Costs Capitalized Subsequent to Acquisition	9,542
Cost amount carried at Close of Period
Land	4,170
Buildings and Equipment	79,301
Total	83,471
Accumulated Depreciation	$ (20,726)
The Atrium at Circleport II, Erlanger, KY
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,796
Buildings and Equipment	1,933
Costs Capitalized Subsequent to Acquisition	578
Cost amount carried at Close of Period
Land	1,796
Buildings and Equipment	2,511
Total	4,307
Accumulated Depreciation	$ (287)
7125 Industrial Road, Florence, KY
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,698
Buildings and Equipment	11,722
Costs Capitalized Subsequent to Acquisition	293
Cost amount carried at Close of Period
Land	1,698
Buildings and Equipment	12,015
Total	13,713
Accumulated Depreciation	$ (2,711)
251 Causeway Street, Boston, MA
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 26,851
Buildings and Equipment	36,756
Costs Capitalized Subsequent to Acquisition	3,665
Cost amount carried at Close of Period
Land	26,851
Buildings and Equipment	40,421
Total	67,272
Accumulated Depreciation	$ (6,205)
The Connect, Chelmsford, MA
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 4,700
Buildings and Equipment	0
Costs Capitalized Subsequent to Acquisition	8,256
Cost amount carried at Close of Period
Land	4,700
Buildings and Equipment	8,256
Total	12,956
Accumulated Depreciation	$ (496)
75 Pleasant Street, Malden, MA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,050
Buildings and Equipment	31,086
Costs Capitalized Subsequent to Acquisition	877
Cost amount carried at Close of Period
Land	1,050
Buildings and Equipment	31,963
Total	33,013
Accumulated Depreciation	$ (9,349)
25 Newport Avenue, Quincy, MA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 2,700
Buildings and Equipment	9,199
Costs Capitalized Subsequent to Acquisition	1,593
Cost amount carried at Close of Period
Land	2,700
Buildings and Equipment	10,792
Total	13,492
Accumulated Depreciation	$ (2,823)
314 Littleton Road, Westford, MA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 5,691
Buildings and Equipment	8,487
Costs Capitalized Subsequent to Acquisition	47
Cost amount carried at Close of Period
Land	5,691
Buildings and Equipment	8,534
Total	14,225
Accumulated Depreciation	$ (717)
Annapolis Commerce Center, Annapolis, MD
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 4,057
Buildings and Equipment	7,665
Costs Capitalized Subsequent to Acquisition	4,599
Cost amount carried at Close of Period
Land	4,057
Buildings and Equipment	12,264
Total	16,321
Accumulated Depreciation	$ (1,121)
4201 Patterson Avenue, Baltimore, MD
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 901
Buildings and Equipment	8,097
Costs Capitalized Subsequent to Acquisition	4,134
Impairment/ Writedowns	(85)
Cost amount carried at Close of Period
Land	893
Buildings and Equipment	12,154
Total	13,047
Accumulated Depreciation	$ (6,291)
7001 Columbia Gateway Drive, Columbia, MD
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 5,642
Buildings and Equipment	10,352
Costs Capitalized Subsequent to Acquisition	399
Cost amount carried at Close of Period
Land	5,642
Buildings and Equipment	10,751
Total	16,393
Accumulated Depreciation	$ (939)
Hillside Center, Columbia, MD
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 3,437
Buildings and Equipment	4,228
Costs Capitalized Subsequent to Acquisition	934
Cost amount carried at Close of Period
Land	3,437
Buildings and Equipment	5,162
Total	8,599
Accumulated Depreciation	$ (643)
TenThreeTwenty, Columbia, MD
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 3,126
Buildings and Equipment	16,361
Costs Capitalized Subsequent to Acquisition	1,932
Cost amount carried at Close of Period
Land	3,126
Buildings and Equipment	18,293
Total	21,419
Accumulated Depreciation	$ (2,370)
3300 75th Avenue, Landover, MD
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,110
Buildings and Equipment	36,371
Costs Capitalized Subsequent to Acquisition	3,140
Cost amount carried at Close of Period
Land	4,110
Buildings and Equipment	39,511
Total	43,621
Accumulated Depreciation	$ (11,474)
Redland 520/530, Rockville, MD
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 12,714
Buildings and Equipment	61,377
Costs Capitalized Subsequent to Acquisition	4,267
Cost amount carried at Close of Period
Land	12,714
Buildings and Equipment	65,644
Total	78,358
Accumulated Depreciation	$ (7,105)
Redland 540, Rockville, MD
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 10,740
Buildings and Equipment	17,714
Costs Capitalized Subsequent to Acquisition	6,113
Cost amount carried at Close of Period
Land	10,740
Buildings and Equipment	23,827
Total	34,567
Accumulated Depreciation	$ (4,390)
Rutherford Business Park, Windsor Mill, MD
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,598
Buildings and Equipment	10,219
Costs Capitalized Subsequent to Acquisition	545
Cost amount carried at Close of Period
Land	1,598
Buildings and Equipment	10,764
Total	12,362
Accumulated Depreciation	$ (2,438)
3550 Green Court, Ann Arbor, MI
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 3,630
Buildings and Equipment	4,857
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	3,630
Buildings and Equipment	4,857
Total	8,487
Accumulated Depreciation	$ (429)
11411 E. Jefferson Avenue, Detroit, MI
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 630
Buildings and Equipment	18,002
Costs Capitalized Subsequent to Acquisition	567
Cost amount carried at Close of Period
Land	630
Buildings and Equipment	18,569
Total	19,199
Accumulated Depreciation	$ (5,358)
Rosedale Corporate Plaza, Roseville, MN
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 672
Buildings and Equipment	6,045
Costs Capitalized Subsequent to Acquisition	1,547
Cost amount carried at Close of Period
Land	672
Buildings and Equipment	7,592
Total	8,264
Accumulated Depreciation	$ (4,338)
1300 Summit Street, Kansas City, MO
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 2,776
Buildings and Equipment	12,070
Costs Capitalized Subsequent to Acquisition	900
Cost amount carried at Close of Period
Land	2,776
Buildings and Equipment	12,970
Total	15,746
Accumulated Depreciation	$ (2,978)
2555 Grand Boulevard, Kansas City, MO
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,209
Buildings and Equipment	51,522
Costs Capitalized Subsequent to Acquisition	4,402
Cost amount carried at Close of Period
Land	4,209
Buildings and Equipment	55,924
Total	60,133
Accumulated Depreciation	$ (4,550)
4241 NE 34th Street, Kansas City, MO
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,133
Buildings and Equipment	5,649
Costs Capitalized Subsequent to Acquisition	4,705
Cost amount carried at Close of Period
Land	1,470
Buildings and Equipment	10,017
Total	11,487
Accumulated Depreciation	$ (4,995)
1220 Echelon Parkway, Jackson, MS
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 440
Buildings and Equipment	25,458
Costs Capitalized Subsequent to Acquisition	529
Cost amount carried at Close of Period
Land	440
Buildings and Equipment	25,987
Total	26,427
Accumulated Depreciation	$ (6,103)
2300 and 2400 Yorkmont Road, Charlotte, NC
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 1,334
Buildings and Equipment	19,075
Costs Capitalized Subsequent to Acquisition	2,509
Cost amount carried at Close of Period
Land	1,334
Buildings and Equipment	21,584
Total	22,918
Accumulated Depreciation	$ (1,966)
18010 and 18020 Burt Street, Omaha, NE
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 6,977
Buildings and Equipment	12,500
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	6,977
Buildings and Equipment	12,500
Total	19,477
Accumulated Depreciation	$ (1,039)
500 Charles Ewing Boulevard, Ewing, NJ
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,808
Buildings and Equipment	26,002
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	4,808
Buildings and Equipment	26,002
Total	30,810
Accumulated Depreciation	$ (2,162)
299 Jefferson Road, Parsippany, NJ
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,543
Buildings and Equipment	2,914
Costs Capitalized Subsequent to Acquisition	865
Cost amount carried at Close of Period
Land	4,543
Buildings and Equipment	3,779
Total	8,322
Accumulated Depreciation	$ (386)
One Jefferson Road, Parsippany, NJ
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,415
Buildings and Equipment	5,249
Costs Capitalized Subsequent to Acquisition	63
Cost amount carried at Close of Period
Land	4,415
Buildings and Equipment	5,312
Total	9,727
Accumulated Depreciation	$ (439)
Airline Corporate Center, Colonie, NY
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 790
Buildings and Equipment	6,400
Costs Capitalized Subsequent to Acquisition	1,141
Cost amount carried at Close of Period
Land	790
Buildings and Equipment	7,541
Total	8,331
Accumulated Depreciation	$ (1,652)
5000 Corporate Court, Holtsville, NY
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 6,530
Buildings and Equipment	17,711
Costs Capitalized Subsequent to Acquisition	4,330
Cost amount carried at Close of Period
Land	6,530
Buildings and Equipment	22,041
Total	28,571
Accumulated Depreciation	$ (5,956)
1212 Pittsford - Victor Road, Pittsford, NY
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 608
Buildings and Equipment	78
Costs Capitalized Subsequent to Acquisition	538
Cost amount carried at Close of Period
Land	608
Buildings and Equipment	616
Total	1,224
Accumulated Depreciation	$ (67)
2231 Schrock Road, Columbus, OH
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 716
Buildings and Equipment	217
Costs Capitalized Subsequent to Acquisition	283
Cost amount carried at Close of Period
Land	716
Buildings and Equipment	500
Total	1,216
Accumulated Depreciation	$ (63)
4600 25th Avenue, Salem, OR
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 6,510
Buildings and Equipment	17,973
Costs Capitalized Subsequent to Acquisition	6,355
Cost amount carried at Close of Period
Land	6,510
Buildings and Equipment	24,328
Total	30,838
Accumulated Depreciation	$ (5,918)
8800 Tinicum Boulevard, Philadelphia, PA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 5,573
Buildings and Equipment	22,686
Costs Capitalized Subsequent to Acquisition	2,396
Cost amount carried at Close of Period
Land	5,573
Buildings and Equipment	25,082
Total	30,655
Accumulated Depreciation	$ (1,976)
446 Wrenplace Road, Fort Mill, SC
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 5,031
Buildings and Equipment	22,524
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	5,031
Buildings and Equipment	22,524
Total	27,555
Accumulated Depreciation	$ (577)
9680 Old Bailes Road, Fort Mill, SC
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 834
Buildings and Equipment	2,944
Costs Capitalized Subsequent to Acquisition	53
Cost amount carried at Close of Period
Land	834
Buildings and Equipment	2,997
Total	3,831
Accumulated Depreciation	$ (247)
16001 North Dallas Parkway, Addison, TX
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 10,282
Buildings and Equipment	63,071
Costs Capitalized Subsequent to Acquisition	945
Cost amount carried at Close of Period
Land	10,282
Buildings and Equipment	64,016
Total	74,298
Accumulated Depreciation	$ (5,636)
Research Park, Austin, TX
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 4,258
Buildings and Equipment	13,747
Costs Capitalized Subsequent to Acquisition	247
Cost amount carried at Close of Period
Land	4,258
Buildings and Equipment	13,994
Total	18,252
Accumulated Depreciation	$ (2,103)
10451 Clay Road, Houston, TX
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 5,495
Buildings and Equipment	10,253
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	5,495
Buildings and Equipment	10,253
Total	15,748
Accumulated Depreciation	$ (854)
202 North Castlegory Road, Houston, TX
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 863
Buildings and Equipment	5,024
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	863
Buildings and Equipment	5,024
Total	5,887
Accumulated Depreciation	$ (393)
6380 Rogerdale Road, Houston, TX
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 12,628
Buildings and Equipment	6,113
Costs Capitalized Subsequent to Acquisition	1,092
Cost amount carried at Close of Period
Land	12,628
Buildings and Equipment	7,205
Total	19,833
Accumulated Depreciation	$ (550)
4221 W. John Carpenter Freeway, Irving, TX
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,413
Buildings and Equipment	2,365
Costs Capitalized Subsequent to Acquisition	1,843
Cost amount carried at Close of Period
Land	1,413
Buildings and Equipment	4,208
Total	5,621
Accumulated Depreciation	$ (736)
8675, 8701-8711 Freeport Pkwy and 8901 Esters Boulevard, Irving, TX
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 10,185
Buildings and Equipment	31,566
Costs Capitalized Subsequent to Acquisition	68
Cost amount carried at Close of Period
Land	10,185
Buildings and Equipment	31,634
Total	41,819
Accumulated Depreciation	$ (2,625)
1511 East Common Street, New Braunfels, TX
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,965
Buildings and Equipment	1,266
Costs Capitalized Subsequent to Acquisition	222
Cost amount carried at Close of Period
Land	4,965
Buildings and Equipment	1,488
Total	6,453
Accumulated Depreciation	$ (124)
2900 West Plano Parkway, Plano, TX
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 6,819
Buildings and Equipment	8,831
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	6,819
Buildings and Equipment	8,831
Total	15,650
Accumulated Depreciation	$ (734)
3400 West Plano Parkway, Plano, TX
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,543
Buildings and Equipment	15,964
Costs Capitalized Subsequent to Acquisition	321
Cost amount carried at Close of Period
Land	4,543
Buildings and Equipment	16,285
Total	20,828
Accumulated Depreciation	$ (1,369)
3600 Weismann Boulevard, San Antonio, TX
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 3,493
Buildings and Equipment	6,662
Costs Capitalized Subsequent to Acquisition	3,300
Cost amount carried at Close of Period
Land	3,493
Buildings and Equipment	9,962
Total	13,455
Accumulated Depreciation	$ (1,129)
701 Clay Road, Waco, TX
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 2,030
Buildings and Equipment	8,708
Costs Capitalized Subsequent to Acquisition	14,327
Cost amount carried at Close of Period
Land	2,060
Buildings and Equipment	23,005
Total	25,065
Accumulated Depreciation	$ (7,173)
1800 Novell Place, Provo, UT
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 7,487
Buildings and Equipment	43,487
Costs Capitalized Subsequent to Acquisition	124
Cost amount carried at Close of Period
Land	7,487
Buildings and Equipment	43,611
Total	51,098
Accumulated Depreciation	$ (3,906)
4885-4931 North 300 West, Provo, UT
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 3,915
Buildings and Equipment	9,429
Costs Capitalized Subsequent to Acquisition	21
Cost amount carried at Close of Period
Land	3,915
Buildings and Equipment	9,450
Total	13,365
Accumulated Depreciation	$ (834)
14660, 14672 and 14668 Lee Road, Chantilly, VA
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 6,966
Buildings and Equipment	74,214
Costs Capitalized Subsequent to Acquisition	6,172
Cost amount carried at Close of Period
Land	6,966
Buildings and Equipment	80,386
Total	87,352
Accumulated Depreciation	$ (10,355)
1434 Crossways, Chesapeake, VA
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 3,617
Buildings and Equipment	19,527
Costs Capitalized Subsequent to Acquisition	2,673
Cost amount carried at Close of Period
Land	3,617
Buildings and Equipment	22,200
Total	25,817
Accumulated Depreciation	$ (2,680)
Enterchange At Meadowville, Chester, VA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,478
Buildings and Equipment	9,594
Costs Capitalized Subsequent to Acquisition	424
Cost amount carried at Close of Period
Land	1,478
Buildings and Equipment	10,018
Total	11,496
Accumulated Depreciation	$ (2,077)
Three Flint Hill, Fairfax, VA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 5,991
Buildings and Equipment	25,536
Costs Capitalized Subsequent to Acquisition	3,118
Cost amount carried at Close of Period
Land	5,991
Buildings and Equipment	28,654
Total	34,645
Accumulated Depreciation	$ (4,356)
7987 Ashton Avenue, Manassas, VA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,562
Buildings and Equipment	8,253
Costs Capitalized Subsequent to Acquisition	1,059
Cost amount carried at Close of Period
Land	1,562
Buildings and Equipment	9,312
Total	10,874
Accumulated Depreciation	$ (1,311)
Two Commercial Place, Norfolk, VA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,494
Buildings and Equipment	21,508
Costs Capitalized Subsequent to Acquisition	575
Cost amount carried at Close of Period
Land	4,494
Buildings and Equipment	22,083
Total	26,577
Accumulated Depreciation	$ (1,744)
1759 & 1760 Business Center Drive, Reston, VA
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 9,066
Buildings and Equipment	78,658
Costs Capitalized Subsequent to Acquisition	7,007
Cost amount carried at Close of Period
Land	9,066
Buildings and Equipment	85,665
Total	94,731
Accumulated Depreciation	$ (15,947)
1775 Wiehle Avenue, Reston, VA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 4,138
Buildings and Equipment	26,120
Costs Capitalized Subsequent to Acquisition	2,000
Cost amount carried at Close of Period
Land	4,138
Buildings and Equipment	28,120
Total	32,258
Accumulated Depreciation	$ (3,312)
9201 Forest Hill Avenue, Richmond, VA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,344
Buildings and Equipment	375
Costs Capitalized Subsequent to Acquisition	466
Cost amount carried at Close of Period
Land	1,344
Buildings and Equipment	841
Total	2,185
Accumulated Depreciation	$ (100)
9960 Mayland Drive, Richmond, VA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 2,614
Buildings and Equipment	15,930
Costs Capitalized Subsequent to Acquisition	3,392
Cost amount carried at Close of Period
Land	2,614
Buildings and Equipment	19,322
Total	21,936
Accumulated Depreciation	$ (3,720)
Parham Place, Richmond, VA
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 913
Buildings and Equipment	1,099
Costs Capitalized Subsequent to Acquisition	563
Cost amount carried at Close of Period
Land	913
Buildings and Equipment	1,662
Total	2,575
Accumulated Depreciation	$ (132)
1751 Blue Hills Drive, Roanoke, VA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 2,689
Buildings and Equipment	7,761
Costs Capitalized Subsequent to Acquisition	0
Cost amount carried at Close of Period
Land	2,689
Buildings and Equipment	7,761
Total	10,450
Accumulated Depreciation	$ (645)
Atlantic Corporate Park, Sterling, VA
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 5,752
Buildings and Equipment	29,316
Costs Capitalized Subsequent to Acquisition	2,713
Cost amount carried at Close of Period
Land	5,752
Buildings and Equipment	32,029
Total	37,781
Accumulated Depreciation	$ (3,499)
Orbital Sciences Campus, Sterling, VA
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 12,275
Buildings and Equipment	19,320
Costs Capitalized Subsequent to Acquisition	780
Cost amount carried at Close of Period
Land	12,275
Buildings and Equipment	20,100
Total	32,375
Accumulated Depreciation	$ (1,754)
Sterling Business Park Lots 8 & 9, Sterling, VA
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 5,871
Buildings and Equipment	44,324
Costs Capitalized Subsequent to Acquisition	103
Cost amount carried at Close of Period
Land	5,871
Buildings and Equipment	44,427
Total	50,298
Accumulated Depreciation	$ (4,714)
65 Bowdoin Street, S. Burlington VT
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 700
Buildings and Equipment	8,416
Costs Capitalized Subsequent to Acquisition	140
Cost amount carried at Close of Period
Land	700
Buildings and Equipment	8,556
Total	9,256
Accumulated Depreciation	$ (2,524)
840 North Broadway, Everett, WA
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 3,360
Buildings and Equipment	15,376
Costs Capitalized Subsequent to Acquisition	3,228
Cost amount carried at Close of Period
Land	3,360
Buildings and Equipment	18,604
Total	21,964
Accumulated Depreciation	$ (4,189)
Stevens Center, Richland, WA
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 3,970
Buildings and Equipment	17,035
Costs Capitalized Subsequent to Acquisition	5,594
Cost amount carried at Close of Period
Land	4,042
Buildings and Equipment	22,557
Total	26,599
Accumulated Depreciation	$ (12,408)
351, 401, 501 Elliot Ave West, Seattle, WA
Real estate and accumulated depreciation
Number of Properties | property	3
Initial Cost to Company
Land	$ 26,640
Buildings and Equipment	52,740
Costs Capitalized Subsequent to Acquisition	5,782
Cost amount carried at Close of Period
Land	26,640
Buildings and Equipment	58,522
Total	85,162
Accumulated Depreciation	$ (4,705)
5353 Yellowstone Road, Cheyenne, WY
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 1,915
Buildings and Equipment	8,217
Costs Capitalized Subsequent to Acquisition	1,882
Cost amount carried at Close of Period
Land	1,950
Buildings and Equipment	10,064
Total	12,014
Accumulated Depreciation	$ (5,551)
Total Real Estate Assets
Real estate and accumulated depreciation
Number of Properties | property	178
Encumbrances	$ 98,178
Initial Cost to Company
Land	883,260
Buildings and Equipment	2,685,828
Costs Capitalized Subsequent to Acquisition	392,665
Impairment/ Writedowns	(22,877)
Cost amount carried at Close of Period
Land	880,004
Buildings and Equipment	3,058,872
Total	3,938,876
Accumulated Depreciation	$ (498,266)
Properties Held for Sale
Real estate and accumulated depreciation
Number of Properties | property	4
Encumbrances	$ 0
Initial Cost to Company
Land	7,731
Buildings and Equipment	26,932
Costs Capitalized Subsequent to Acquisition	3,762
Impairment/ Writedowns	(10,635)
Cost amount carried at Close of Period
Land	5,896
Buildings and Equipment	21,894
Total	27,790
Accumulated Depreciation	$ (2,354)
Properties Held for Sale | 2115 East Jefferson Street, Rockville, MD
Real estate and accumulated depreciation
Number of Properties | property	1
Initial Cost to Company
Land	$ 3,349
Buildings and Equipment	11,152
Costs Capitalized Subsequent to Acquisition	592
Impairment/ Writedowns	(8,646)
Cost amount carried at Close of Period
Land	1,678
Buildings and Equipment	4,769
Total	6,447
Accumulated Depreciation	$ 0
Properties Held for Sale | Greenbrier Towers, Chesapeake, VA
Real estate and accumulated depreciation
Number of Properties | property	2
Initial Cost to Company
Land	$ 3,437
Buildings and Equipment	11,241
Costs Capitalized Subsequent to Acquisition	3,067
Cost amount carried at Close of Period
Land	3,437
Buildings and Equipment	14,308
Total	17,745
Accumulated Depreciation	$ (2,354)
Properties Held for Sale | 11050 West Liberty Drive, Milwaukee, WI
Real estate and accumulated depreciation
Number of Properties | building	1
Initial Cost to Company
Land	$ 945
Buildings and Equipment	4,539
Costs Capitalized Subsequent to Acquisition	103
Impairment/ Writedowns	(1,989)
Cost amount carried at Close of Period
Land	781
Buildings and Equipment	2,817
Total	3,598
Accumulated Depreciation	$ 0

SCHEDULE III REAL ESTATE AND _3

SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Mortgage debt, net	$ 123
Aggregate cost for federal income tax purposes	$ 7,358,924
Useful life of buildings and improvements	40 years
Useful life of equipment	12 years

SCHEDULE III REAL ESTATE AND _4

SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION - Carrying Amount and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real Estate Properties
Balance at the beginning of the period	$ 3,522,143	$ 3,493,231	$ 3,944,636
Additions	584,805	122,116	66,221
Loss on asset impairment	(58,696)	(2,954)	(22,255)
Disposals	(72,137)	(31,193)	(424,302)
Cost basis adjustment	(37,239)	(3,968)	(9,169)
Reclassification of assets of properties held for sale	(27,790)	(55,089)	(61,900)
Balance at the end of the period	3,911,086	3,522,143	3,493,231
Accumulated Depreciation
Balance at the beginning of the period	451,914	387,656	375,147
Additions	92,266	83,828	89,398
Loss on asset impairment	0	0	0
Disposals	(8,675)	(13,125)	(64,167)
Cost basis adjustment	(37,239)	(3,968)	(9,169)
Reclassification of assets of properties held for sale	(2,354)	(2,477)	(3,553)
Balance at the end of the period	$ 495,912	$ 451,914	$ 387,656