Peakstone Realty Trust (PKST) 10-K 26 Feb 21 2020 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 24, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	000-55605
Entity Registrant Name	Griffin Capital Essential Asset REIT, Inc.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	46-4654479
Entity Address, Address Line One	1520 E. Grand Ave
Entity Address, City or Town	El Segundo
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90245
City Area Code	310
Local Phone Number	469-6100
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	false
Entity Public Float			$ 0
Documents Incorporated by Reference [Text Block]	Documents Incorporated by Reference: The Registrant incorporates by reference in Part III (Items 10, 11, 12, 13 and 14) of this Form 10-K portions of its Definitive Proxy Statement for the 2021 Annual Meeting of Stockholders.
Entity Central Index Key	0001600626
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Common Class T
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		559,728
Common Class S
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		1,801
Common Class D
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		41,302
Common Class I
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		1,900,456
Common Class A
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		24,396,690
Common Class AA
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		47,442,476
Common Class AAA
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		923,087
Common Class E
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		155,608,273

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents		$ 168,954	$ 54,830
Restricted cash		34,352	58,430
Real estate:
Land		445,674	458,339
Building and improvements		3,112,253	3,043,527
Tenant origination and absorption cost		740,489	744,773
Construction in progress		11,886	31,794
Total real estate		4,310,302	4,278,433
Less: accumulated depreciation and amortization		(817,773)	(668,104)
Total real estate, net		3,492,529	3,610,329
Investments in unconsolidated entities		34	11,028
Intangible assets, net		10,035	12,780
Deferred rent receivable		98,116	73,012
Deferred leasing costs, net		45,966	49,390
Goodwill		229,948	229,948
Due from affiliates		1,411	837
Right of use asset		39,935	41,347
Other assets		30,570	33,571
Total assets		4,151,850	4,175,502
LIABILITIES AND EQUITY
Debt, net		2,140,427	1,969,104
Restricted reserves		12,071	14,064
Interest rate swap liability		53,975	24,146
Redemptions payable		5,345	96,648
Distributions payable		9,430	15,530
Due to affiliates		3,272	10,883
Intangible liabilities, net		27,333	31,805
Lease liability		45,646	45,020
Accrued expenses and other liabilities		114,434	96,389
Total liabilities		2,411,933	2,303,589
Commitments and contingencies (Note 13)
Noncontrolling interests subject to redemption; 556,099 and 554,110 units as of December 31, 2020 and December 31, 2019, respectively		4,610	4,831
Stockholders’ equity:
Common stock, $0.001 par value; 800,000,000 shares authorized; 230,320,668 and 227,853,720 shares outstanding in the aggregate as of December 31, 2020 and December 31, 2019, respectively(1)	[1]	230	228
Additional paid-in-capital		2,103,028	2,060,604
Cumulative distributions		(813,892)	(715,792)
Accumulated earnings		140,354	153,312
Accumulated other comprehensive loss		(48,001)	(21,875)
Total stockholders’ equity		1,381,719	1,476,477
Noncontrolling interests		226,550	245,040
Total equity		1,608,269	1,721,517
Total liabilities and equity		$ 4,151,850	$ 4,175,502
Noncontrolling Interests Subject to Redemption		556,099	554,110
Common Stock, Shares Authorized		800,000,000	800,000,000
Common Stock, Par or Stated Value Per Share		$ 0.001	$ 0.001
Perpetual Convertible Preferred Shares
LIABILITIES AND EQUITY
Perpetual convertible preferred shares and common stock subject to redemption		$ 125,000	$ 125,000
Common Stock
LIABILITIES AND EQUITY
Perpetual convertible preferred shares and common stock subject to redemption		$ 2,038	$ 20,565
[1]	See Note 9, Equity , for the number of shares outstanding of each class of common stock as of December 31, 2020.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Noncontrolling interest, units eligible towards redemption (in shares)	556,099	554,110
Common Stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, number of shares authorized (in shares)	800,000,000	800,000,000
Common stock, number of shares outstanding (in shares)	230,320,668	227,853,720

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Rental income	$ 397,452	$ 387,108	$ 336,359
Expenses:
Property operating expense	57,461	55,301	49,509
Property tax expense	37,590	37,035	44,662
Property management fees to non-affiliates	3,656	3,528	0
Property asset management fees to affiliates	0	0	23,668
Property management fees to affiliates	0	0	9,479
Self-administration transaction expense	0	0	1,331
General and administrative expenses	38,633	26,078	6,968
Corporate operating expenses to affiliates	2,500	2,745	3,594
Impairment provision	23,472	30,734	0
Depreciation and amortization	161,056	153,425	119,168
Total expenses	324,368	308,846	258,379
Income before other income and (expenses)	73,084	78,262	77,980
Other income (expenses):
Interest expense	(79,646)	(73,557)	(55,194)
Management fee revenue from affiliates	0	6,368	0
Other income, net	3,228	1,340	275
(Loss) from investment in unconsolidated entities	(6,523)	(5,307)	(2,254)
Gain from disposition of assets	4,083	29,938	1,231
Net (loss) income	(5,774)	37,044	22,038
Distributions to redeemable preferred shareholders	(8,708)	(8,188)	(3,275)
Net loss (income) attributable to noncontrolling interests	1,732	(3,749)	(789)
Net (loss) income attributable to controlling interest	(12,750)	25,107	17,974
Distributions to redeemable noncontrolling interests attributable to common stockholders	(208)	(320)	(356)
Net (loss) income attributable to common stockholders	$ (12,958)	$ 24,787	$ 17,618
Net income attributable to common stockholders per share, basic and diluted (in usd per share)	$ (0.06)	$ 0.11	$ 0.10
Weighted average number of common shares outstanding, basic and diluted (shares)	230,042,543	222,531,173	169,907,020

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (5,774)	$ 37,044	$ 22,038
Other comprehensive loss:
Equity in other comprehensive (loss) income of unconsolidated joint venture	0	(217)	122
Change in fair value of swap agreements	(29,704)	(22,303)	(5,301)
Total comprehensive (loss) income	(35,478)	14,524	16,859
Distributions to redeemable preferred shareholders	(8,708)	(8,188)	(3,275)
Distributions to redeemable noncontrolling interests attributable to common stockholders	(208)	(320)	(356)
Comprehensive loss (income) attributable to noncontrolling interests	5,310	(695)	(479)
Comprehensive (loss) income attributable to common stockholders	$ (39,084)	$ 5,321	$ 12,749

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Total Stockholders’ Equity	Common Stock	Additional Paid-In Capital	Cumulative Distributions	Accumulated Income (Deficit)	Accumulated Other Comprehensive (Loss) Income	Non-controlling Interests
BALANCE at Dec. 31, 2017	$ 1,251,811	$ 1,220,706	$ 179	$ 1,561,686	$ (454,526)	$ 110,907	$ 2,460	$ 31,105
BALANCE (in shares) at Dec. 31, 2017			179,121,568
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Deferred equity compensation	38	38		38
Deferred equity compensation (in shares)			8,035
Cash distributions to common stockholders	(75,613)	(75,613)			(75,613)
Issuance of shares for distribution reinvestment plan	0		$ 4	40,834	(40,838)
Issuance of shares for distribution reinvestment plan (shares)			4,262,336
Repurchase of common stock	(83,574)	(83,574)	$ (9)	(83,565)
Repurchase of common stock (shares)			(9,113,598)
Reduction of common stock subject to redemption	42,736	42,736		42,736
Issuance of limited partnership units	205,000							205,000
EA Merger	0
Distributions to noncontrolling interests	(4,368)							(4,368)
Distributions to noncontrolling interests subject to redemption	(13)							(13)
Offering costs	(4,959)	(4,959)		(4,959)
Net income	18,407	17,618				17,618		789
Other comprehensive loss	(5,179)	(4,869)					(4,869)	(310)
BALANCE at Dec. 31, 2018	1,344,286	1,112,083	$ 174	1,556,770	(570,977)	128,525	(2,409)	232,203
BALANCE (in shares) at Dec. 31, 2018			174,278,341
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Gross proceeds from issuance of common stock	9,383	9,383		9,383
Gross proceeds from issuance of common stock (shares)			973,490
Deferred equity compensation	2,623	2,623		2,623
Deferred equity compensation (in shares)			260,039
Cash distributions to common stockholders	(89,836)	(89,836)			(89,836)
Issuance of shares for distribution reinvestment plan	220	220	$ 4	41,056	(40,840)
Issuance of shares for distribution reinvestment plan (shares)			4,298,420
Repurchase of common stock	(296,659)	(296,659)	$ (30)	(296,629)
Repurchase of common stock (shares)			(31,290,588)
Repurchase of noncontrolling interest								0
Reduction of common stock subject to redemption	(9,042)	(9,042)		(9,042)
Issuance of limited partnership units	25,000							25,000
Issuance of stock dividend for noncontrolling interest	1,861							1,861
Issuance of stock dividends	(1,948)	(1,948)	$ 2	12,189	(14,139)
Issuance of stock dividends (shares)			1,279,084
EA Merger	751,277	746,238	$ 78	746,160				5,039
EA Merger (shares)			78,054,934
Distributions to noncontrolling interests	(19,716)							(19,716)
Distributions to noncontrolling interests subject to redemption	(45)							(45)
Offering costs	(1,906)	(1,906)		(1,906)
Reclass of noncontrolling interest subject to redemption	3							3
Net income	28,536	24,787				24,787		3,749
Other comprehensive loss	(22,520)	(19,466)					(19,466)	(3,054)
BALANCE at Dec. 31, 2019	$ 1,721,517	1,476,477	$ 228	2,060,604	(715,792)	153,312	(21,875)	245,040
BALANCE (in shares) at Dec. 31, 2019	227,853,720		227,853,720
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Gross proceeds from issuance of common stock	$ 4,141	4,141		4,141
Gross proceeds from issuance of common stock (shares)			433,328
Deferred equity compensation	4,106	4,106		4,106
Deferred equity compensation (in shares)			436,704
Shares acquired to satisfy employee tax withholding requirements on vesting restricted stock	(751)	(751)		(751)
Shares acquired to satisfy employee tax withholding requirements on vesting restricted stock (shares)			(78,849)
Cash distributions to common stockholders	(69,532)	(69,532)			(69,532)
Issuance of shares for distribution reinvestment plan	1,677	1,677	$ 3	24,494	(22,820)
Issuance of shares for distribution reinvestment plan (shares)			2,693,560
Repurchase of common stock	(16,519)	(16,519)	$ (2)	(16,517)
Repurchase of common stock (shares)			(1,841,887)
Repurchase of noncontrolling interest	(1,137)							(1,137)
Reduction of common stock subject to redemption	18,528	18,528		18,528
Issuance of stock dividend for noncontrolling interest	1,068							1,068
Issuance of stock dividends	1,941	1,941	$ 1	7,688	(5,748)
Issuance of stock dividends (shares)			824,092
EA Merger	0
Distributions to noncontrolling interests	(13,306)							(13,306)
Distributions to noncontrolling interests subject to redemption	(29)							(29)
Offering costs	735	735		735
Reclass of noncontrolling interest subject to redemption	224							224
Net income	(14,690)	(12,958)				(12,958)		(1,732)
Other comprehensive loss	(29,704)	(26,126)					(26,126)	(3,578)
BALANCE at Dec. 31, 2020	$ 1,608,269	$ 1,381,719	$ 230	$ 2,103,028	$ (813,892)	$ 140,354	$ (48,001)	$ 226,550
BALANCE (in shares) at Dec. 31, 2020	230,320,668		230,320,668

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities:
Net (loss) income	$ (5,774)	$ 37,044	$ 22,038
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation of building and building improvements	93,980	80,394	60,120
Amortization of leasing costs and intangibles, including ground leasehold interests and leasing costs	67,076	73,031	59,048
Amortization of below market leases, net	(2,292)	(3,201)	(685)
Amortization of deferred financing costs and debt premium	2,607	5,562	3,071
Amortization of swap interest	126	126	126
Deferred rent	(25,687)	(19,519)	(8,571)
Deferred rent, ground lease	2,065	1,640	0
Termination fee revenue - receivable from tenant, net	0	(6,000)	(3,114)
Gain from sale of depreciable operating property	(4,083)	(29,940)	(1,231)
Gain on fair value of earn-out	(2,657)	(1,461)	0
Unrealized loss on interest rate swap	0	0	2
Loss from investment in unconsolidated entities	2,071	5,307	2,254
Investment in unconsolidated entities valuation adjustment	4,453	0	0
Loss from investments	31	307	0
Impairment provision	23,472	30,734	0
Performance distribution allocation (non-cash)	0	(2,604)	0
Stock-based compensation	4,107	2,623	38
Change in operating assets and liabilities:
Deferred leasing costs and other assets	4,383	(7,775)	(13,503)
Restricted reserves	27	14	57
Accrued expenses and other liabilities	4,203	(9,505)	3,463
Due to affiliates, net	(3,570)	4,072	(2,254)
Net cash provided by operating activities	164,538	160,849	120,859
Investing Activities:
Cash acquired in connection with the EA Merger, net of acquisition costs	0	25,320	0
Acquisition of properties, net	(16,584)	(38,775)	(182,250)
Proceeds from disposition of properties	51,692	139,446	11,442
Real estate acquisition deposits	1,047	(1,047)	(3,350)
Reserves for tenant improvements		1,039
Reserves for tenant improvements	(1,530)		(357)
Payments for construction in progress	(58,938)	(46,346)	(24,398)
Investment in unconsolidated joint venture	(8,160)	0	(3,274)
Distributions of capital from investment in unconsolidated entities	8,531	14,603	7,691
Payments to Acquire Other Investments	(1,029)	(8,422)	0
Net cash (used in) provided by investing activities	(24,971)	85,818	(194,496)
Financing Activities:
Proceeds from borrowings - KeyBank Loans	0	627,000	0
Proceeds from borrowings - Revolver/KeyBank Loans	215,000	315,854	0
Proceeds from borrowings - Revolver Loan - EA-1	0	0	96,100
Principal payoff of secured indebtedness - Revolver Loan	(53,000)	(104,439)	0
Principal payoff of secured indebtedness - Mortgage Debt	0	0	(18,954)
Principal payoff of secured indebtedness - Unsecured Credit Facility - EA-1	0	(715,000)	(106,253)
Principal amortization payments on secured indebtedness	(7,362)	(6,577)	(6,494)
Deferred financing costs	(4,725)	(5,737)	(24)
Offering costs	(594)	(2,384)	(4,959)
Issuance of perpetual convertible preferred shares	0	0	125,000
Repurchase of common stock	(107,821)	(200,013)	(83,574)
Repurchase of noncontrolling interest	(1,137)	(53)	0
Issuance of common stock, net of discounts and underwriting costs	4,698	8,826	0
Repurchase of common shares to satisfy employee tax withholding requirements	(751)	0	0
Dividends paid on preferred units subject to redemption	(8,396)	(8,188)	(1,228)
Distributions to noncontrolling interests	(13,290)	(16,865)	(4,737)
Distributions to common stockholders	(72,143)	(90,116)	(71,822)
Net cash used in financing activities	(49,521)	(197,692)	(76,945)
Net increase (decrease) in cash, cash equivalents and restricted cash	90,046	48,975	(150,582)
Cash, cash equivalents and restricted cash at the beginning of the period	113,260	64,285	214,867
Cash, cash equivalents and restricted cash at the end of the period	203,306	113,260	64,285
Supplemental disclosure of cash flow information:
Cash paid for interest	80,155	65,040	50,736
Supplemental disclosures of non-cash investing and financing transactions:
Goodwill -Self Administration Transaction	0	0	229,948
Affiliates - receivables and other related party assets acquired in Self Administration Transaction	0	0	19,878
Distributions payable to common stockholders	6,864	13,035	9,799
Distributions payable to noncontrolling interests	943	1,758	402
Common stock issued pursuant to the distribution reinvestment plan	24,497	41,060	40,838
Common stock redemptions funded subsequent to period-end	(5,345)	96,648	0
Issuance of stock dividends	5,747	14,139	0
Mortgage debt assumed in conjunction with the acquisition of real estate assets plus a premium of $109	18,884	0	0
Payable for construction in progress	472	0	0
Accrued tenant obligations	30,011	11,802	0
Limited partnership units issued in exchange for net assets acquired in Self Administration Transaction	0	25,000	205,000
Due to affiliates- Self Administration Transaction	0	0	41,114
Other liabilities assumed in Self Administration Transaction	0	0	7,951
Decrease in fair value swap agreement	(29,704)	(22,303)	(5,427)
Decrease in stockholder servicing fee payable	(1,388)	0	0
Net assets acquired in Merger in exchange for common shares	0	751,277	0
Implied EA-1 common stock and operating partnership units issued in exchange for net assets acquired in Merger	0	751,277	0
Operating lease right-of-use assets obtained in exchange for lease liabilities upon adoption of ASC 842		16,919
Distributions to redeemable noncontrolling interests attributable to common stockholders as reflected on the consolidated statements of operations	$ 0	$ 0	$ 355

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Statement of Cash Flows [Abstract]
Unamortized premium	$ 109

Organization

Organization	12 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Griffin Capital Essential Asset REIT, Inc. (“GCEAR” or the “Company”) is an internally managed, publicly registered real estate investment trust ("REIT") that owns and operates a geographically diversified portfolio of corporate office and industrial properties that are primarily net-leased. GCEAR’s year-end date is December 31. On December 14, 2018, GCEAR, Griffin Capital Essential Asset Operating Partnership II, L.P. (the “GCEAR II Operating Partnership”), GCEAR’s wholly-owned subsidiary Globe Merger Sub, LLC (“EA Merger Sub”), the entity formerly known as Griffin Capital Essential Asset REIT, Inc. (“EA-1”), and Griffin Capital Essential Asset Operating Partnership, L.P. (the “EA-1 Operating Partnership”) entered into an Agreement and Plan of Merger (the “EA Merger Agreement”). On April 30, 2019, pursuant to the EA Merger Agreement, (i) EA-1 merged with and into EA Merger Sub, with EA Merger Sub surviving as GCEAR’s direct, wholly-owned subsidiary (the “EA Company Merger”) and (ii) the GCEAR II Operating Partnership merged with and into the EA-1 Operating Partnership (the “EA Partnership Merger” and, together with the EA Company Merger, the “EA Mergers”), with the EA-1 Operating Partnership (and now known as the “GCEAR Operating Partnership”) surviving the EA Partnership Merger. In addition, on April 30, 2019, following the EA Mergers, EA Merger Sub merged into GCEAR. In connection with the EA Mergers, the Company converted EA-1’s Series A cumulative perpetual convertible preferred stock into GCEAR’s newly created Series A cumulative perpetual convertible preferred stock (the “Series A Preferred Shares”). Also on April 30, 2019, the Company converted each EA-1 Operating Partnership unit outstanding into 1.04807 Class E units in the GCEAR Operating Partnership and each unit outstanding in the GCEAR II Operating Partnership converted into one unit of like class in the GCEAR Operating Partnership (the “GCEAR OP Units”). The GCEAR Operating Partnership and Griffin Capital Real Estate Company, LLC ("GRECO") are the subsidiaries of the Company and are the entities through which the Company conducts its business. In addition, on December 14, 2018, EA-1 and the EA-1 Operating Partnership entered into a series of transactions, agreements, and amendments to EA-1’s existing agreements and arrangements with EA-1’s former sponsor, Griffin Capital Company, LLC ("GCC"), and Griffin Capital, LLC (“GC LLC”), pursuant to which GCC and GC LLC contributed all of the membership interests of GRECO (including the GRECO employees) and certain assets related to the business of GRECO to the EA-1 Operating Partnership (the "Self-Administration Transaction"). As a result of the Self-Administration Transaction, EA-1 became self-managed and acquired the advisory, asset management and property management business of GRECO. In connection with the EA Mergers, many of the agreements and amendments entered into by EA-1 as part of the Self-Administration Transaction were assumed by GCEAR pursuant to the EA Mergers. In connection with the EA Mergers, GCEAR was the legal acquirer and EA-1 was the accounting acquirer for financial reporting purposes. T hus, the financial information set forth herein subsequent to the EA Mergers reflects results of the combined entity, and the financial information set forth herein prior to the EA Mergers reflects EA-1’s results. For this reason, period to period comparisons may not be meaningful. When used in this section, unless the context requires otherwise, all references to “GCEAR,” “we,” “our,” and “us” herein mean EA-1 and one or more of EA-1’s subsidiaries for periods prior to the EA Mergers, and GCEAR and one or more of GCEAR’s subsidiaries, including GRECO and the GCEAR Operating Partnership, for periods following the EA Mergers. Certain historical information of GCEAR is included for background purposes. On October 29, 2020, Cole Office & Industrial REIT (CCIT II), Inc. (“CCIT II”), a Maryland corporation, Cole Corporate Income Operating Partnership II, LP, a Delaware limited partnership and a wholly owned subsidiary of CCIT II (the “CCIT II Operating Partnership”), CRI CCIT II LLC, a Delaware limited liability company and a wholly owned subsidiary of CCIT II (“CCIT II LP” and, together with CCIT II and the CCIT II Operating Partnership, the “CCIT II Parties”), GCEAR, GRT (Cardinal REIT Merger Sub), LLC, a Maryland limited liability company and a wholly owned subsidiary of GCEAR (“GCEAR Merger Sub”), the GCEAR Operating Partnership, GRT OP (Cardinal New GP Sub), LLC, a Delaware limited liability company and a wholly owned subsidiary of the GCEAR Operating Partnership (“New GP Sub”), GRT OP (Cardinal LP Merger Sub), LLC, a Delaware limited liability company and a wholly owned subsidiary of the GCEAR Operating Partnership (“LP Merger Sub”), GRT OP (Cardinal OP Merger Sub), LLC, a Delaware limited liability company and a subsidiary of LP Merger Sub and New GP Sub (“OP Merger Sub” and, together with GCEAR, GCEAR Merger Sub, the GCEAR Operating Partnership, New GP Sub and LP Merger Sub, the “GCEAR Parties”), entered into an Agreement and Plan of Merger (the “CCIT II Merger Agreement”) pursuant to which (i) CCIT II will merge with and into GCEAR Merger Sub (the “CCIT II REIT Merger”), with GCEAR Merger Sub being the surviving entity, (ii) OP Merger Sub will merge with and into CCIT II Operating Partnership (the “CCIT II Partnership Merger”), with the CCIT II Operating Partnership being the surviving entity and (iii) CCIT II LP will merge with and into LP Merger Sub (the “CCIT II LP Merger” and, together with the CCIT II REIT Merger and the CCIT II Partnership Merger, the “CCIT II Mergers”), with CCIT II LP Merger Sub being the surviving entity. At the effective time of the CCIT II Mergers and subject to the terms and conditions of the CCIT II Merger Agreement, each issued and outstanding share of CCIT II Class A common stock and each issued and outstanding share of CCIT II Class T common stock (other than excluded shares) will be converted into the right to receive 1.392 shares of GCEAR Class E common stock, subject to the treatment of fractional shares in accordance with the CCIT II Merger Agreement. The board of directors of CCIT II (the “CCIT II Board”), based on the unanimous recommendation of the special committee of the CCIT II Board, which was comprised solely of independent directors, and the board of directors of GCEAR, respectively, each approved the CCIT II Mergers. The obligations of CCIT II and GCEAR to effect the CCIT II Mergers are subject to the satisfaction or waiver of several conditions set forth in the CCIT II Merger Agreement, as described in the proxy statement/prospectus filed with the SEC on December 11, 2020, including the approval of CCIT II stockholders. On February 23, 2021, CCIT II held a special meeting of its stockholders and the CCIT II stockholders voted to approve the CCIT II REIT Merger and the other proposals described in the proxy statement/prospectus filed with the SEC on December 11, 2020. The GCEAR Operating Partnership owns, directly or indirectly, all of the properties that the Company has acquired. As of December 31, 2020, the Company owned approximately 87.8% of the GCEAR OP Units of the GCEAR Operating Partnership. As a result of the contribution of five properties to the Company and the Self-Administration Transaction, the former sponsor and certain of its affiliates owned approximately 10.6% of t he limited partnership units of the GCEAR Operating Partnership, including approximately 2.4 million units owned by the Company’s Executive Chairman and Chairman of the Board, Kevin A. Shields, as of December 31, 2020. The remaining approximately 1.6% GCEAR OP Units are owned by unaffiliated third parties. The GCEAR Operating Partnership may conduct certain activities through one or more of the Company’s taxable REIT subsidiaries, which are wholly-owned subsidiaries of the GCEAR Operating Partnership. As of December 31, 2020, the Company ha d issued 284,595,718 shares (approximately $2.8 billion) of c ommon stock since November 9, 2009 in various private offerings, public offerings, distribution reinvestment plan ("DRP") offerings and mergers (includes EA-1 offerings and EA-1 merger with Signature Office REIT, Inc. and the EA Mergers). Th ere were 230,320,668 shares of common stock outstanding as of December 31, 2020, including shares issued pursuant to the DRP, less shares redeemed pursuant to the share redemption program ("SRP") and a self-tender offer that occurred in May 2019. As of December 31, 2020 and December 31, 2019, the Company had issued approximately $318.2 million and $293.7 million in shares pursuant to the DRP, respectively . As of December 31, 2020, 230,390 shares subject to the Company's quarterly cap on aggregate redemptions were classified on the consolidated balance sheet as common stock subject to redemption.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies The accompanying cons olidated financial statements of the Company are prepared by management on the accrual basis of accounting and in accordance with generally accepted accounting principles in the United States (“GAAP”) as contained in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”), and in conjunction with rules and regulations of the SEC. The consolidated financial statements include accounts and related adjustments, which are, in the opinion of management, of a normal recurring nature and necessary for a fair presentation of the Company's financial position, results of operations and cash flows for the years ended December 31, 2020 and 2019. The consolidated financial statements of the Company include all accounts of the Company, the GCEAR Operating Partnership, and its subsidiaries. Intercompany transactions are not shown on the consolidated statements. However, each property owning entity is a wholly-owned subsidiary which is a special purpose entity ("SPE"), whose assets and credit are not available to satisfy the debts or obligations of any other entity, except to the extent required with respect to any co-borrower or guarantor under the same credit facility. Principles of Consolidation The Company's financial statements, and the financial statements of the GCEAR Operating Partnership, including its wholly-owned subsidiaries, are consolidated in the accompanying consolidated financial statements. The portion of these entities not wholly-owned by the Company is presented as noncontrolling interests. All significant intercompany accounts and transactions have been eliminated in consolidation. Consolidation Considerations Current accounting guidance provides a framework for identifying a variable interest entity (“VIE”) and determining when a company should include the assets, liabilities, noncontrolling interests, and results of activities of a VIE in its consolidated financial statements. In general, a VIE is an entity or other legal structure used to conduct activities or hold assets that either (1) has an insufficient amount of equity to carry out its principal activities without additional subordinated financial support, (2) has a group of equity owners that are unable to make significant decisions about its activities, or (3) has a group of equity owners that do not have the obligation to absorb losses or the right to receive returns generated by its operations. Generally, a VIE should be consolidated if a party with an ownership, contractual, or other financial interest in the VIE (a variable interest holder) has the power to direct the VIE’s most significant activities and the obligation to absorb losses or right to receive benefits of the VIE that could be significant to the VIE. A variable interest holder that consolidates the VIE is called the primary beneficiary. Upon consolidation, the primary beneficiary generally must initially record all of the VIE’s assets, liabilities, and noncontrolling interests at fair value and subsequently account for the VIE as if it were consolidated based on majority voting interest. See Note 4, Investments in Unconsolidated Entities, for more detail . Cash and Cash Equivalents The Company considers all short-term, highly liquid investments that are readily convertible to cash with a maturity of three months or less at the time of purchase to be cash equivalents. Cash and cash equivalents may include cash and short-term investments. Short-term investments are stated at cost, which approximates fair value. There were no cash equivalents, nor were there restrictions on the use of the Company’s cash balance as of December 31, 2020 and 2019. The Company maintains its cash accounts with major financial institutions. The cash balances consist of business checking accounts. These accounts are insured by the Federal Deposit Insurance Corporation up to $250,000 at each institution. The Company has not experienced any losses with respect to cash balances in excess of government provided insurance. Management believes there was no significant concentration of credit risk with respect to these cash balances as of December 31, 2020. Restricted Cash In conjunction with acquisitions of certain assets, as required by certain lease provisions or certain lenders in conjunction with an acquisition or debt financing, or credits received by the seller of certain assets, the Company assumed or funded reserves for specific property improvements and deferred maintenance, re-leasing costs, and taxes and insurance, which are included on the consolidated balance sheets as restricted cash. Real Estate Purchase Price Allocation The Company applies the provisions in ASC 805-10, Business Combinations ( " ASC 805-10"), to account for the acquisition of real estate, or real estate related assets, in which a lease, or other contract, is in place representing an active revenue stream, as an asset acquisition (in rare cases, a business combination). In accordance with the provisions of ASC 805-10 (on an asset acquisition), the Company recognizes the assets acquired, the liabilities assumed and any noncontrolling interest in the acquired entity at their relative fair values. The accounting provisions have also established that transaction costs associated with an asset acquisition are capitalized. Acquired in-place leases are valued as above-market or below-market as of the date of acquisition. The valuation is measured based on the present value (using an interest rate, which reflects the risks associated with the leases acquired) of the difference between (a) the contractual amounts to be paid pursuant to the in-place leases and (b) management’s estimate of fair market lease rates for the corresponding in-place leases over a period equal to the remaining non-cancelable term of the lease for above-market leases, taking into consideration below-market extension options for below-market leases. In addition, renewal options are considered and will be included in the valuation of in-place leases if (1) it is likely that the tenant will exercise the option, and (2) the renewal rent is considered to be sufficiently below a fair market rental rate at the time of renewal. The above-market and below-market lease values are capitalized as intangible lease assets or liabilities and amortized as an adjustment to rental income over the remaining terms of the respective leases. The aggregate relative fair value of in-place leases includes direct costs associated with obtaining a new tenant, opportunity costs associated with lost rentals, which are avoided by acquiring an in-place lease, and tenant relationships. Direct costs associated with obtaining a new tenant include commissions, tenant improvements, and other direct costs, and are estimated using methods similar to those used in independent appraisals and management’s consideration of current market costs to execute a similar lease. These direct costs are considered intangible lease assets and are included with real estate assets on the consolidated balance sheets. The intangible lease assets are amortized to expense over the remaining terms of the respective leases. The value of opportunity costs is calculated using the contractual amounts to be paid, including real estate taxes, insurance, and other operating expenses, pursuant to the in-place leases over a market lease-up period for a similar lease. Customer relationships are valued based on management’s evaluation of certain characteristics of each tenant’s lease and the Company’s overall relationship with that respective tenant. Characteristics management will consider in allocating these values include the nature and extent of the Company’s existing business relationships with tenants, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals (including those existing under the terms of the lease agreement), among other factors. These intangibles will be included in intangible lease assets on the consolidated balance sheets and are amortized to expense over the remaining term of the respective leases. The determination of the relative fair values of the assets and liabilities acquired requires the use of significant assumptions about current market rental rates, rental growth rates, discount rates and other variables. Depreciation and Amortization The purchase price of real estate acquired and costs related to development, construction, and property improvements are capitalized. Repairs and maintenance costs include all costs that do not extend the useful life of the real estate asset and are expensed as incurred. The Company considers the period of future benefit of an asset to determine the appropriate useful life. The Company anticipates the estimated useful lives of its assets by class to be generally as follows: Buildings 25-40 years Building Improvements 5-20 years Land Improvements 15-25 years Tenant Improvements Shorter of estimated useful life or remaining contractual lease term Tenant Origination and Absorption Cost Remaining contractual lease term In-place Lease Valuation Remaining contractual lease term with consideration as to below-market extension options for below-market leases If a lease is terminated or amended prior to its scheduled expiration, the Company will accelerate/extend the remaining useful life of the unamortized lease-related costs. Impairment of Real Estate and Related Intangible Assets In accordance with the provisions of the Impairment or Disposal of Long-Lived Assets Subsections of ASC 360, the Company assesses the carrying values of our respective long-lived assets, whenever events or changes in circumstances indicate that the carrying amounts of these assets may not be fully recoverable. Recoverability of real estate assets is measured by comparison of the carrying amount of the asset to the estimated future undiscounted cash flows. To review real estate assets for recoverability, the Company considers current market conditions as well as the Company's intent with respect to holding or disposing of the asset. The intent with regard to the underlying assets might change as market conditions and other factors change. Fair value is determined through various valuation techniques, including discounted cash flow models, applying a capitalization rate to estimated net operating income of a property, quoted market values and third party appraisals, where considered necessary. The use of projected future cash flows is based on assumptions that are consistent with estimates of future expectations and the strategic plan used to manage the Company's underlying business. If the Company analysis indicates that the carrying value of the real estate asset is not recoverable on an undiscounted cash flow basis, the Company will recognize an impairment charge for the amount by which the carrying value exceeds the current estimated fair value of the real estate property. Projections of expected future undiscounted cash flows require management to estimate future market rental income amounts subsequent to the expiration of current lease agreements, property operating expenses, the number of months it takes to re-lease the property and the number of years the property is held for investment. Revenue Recognition Leases associated with the acquisition and contribution of certain real estate assets have net minimum rent payment increases during the term of the lease and are recorded to rental revenue on a straight-line basis, commencing as of the contribution or acquisition date. If a lease provides for contingent rental income, the Company will defer the recognition of contingent rental income, such as percentage rents, until the specific target that triggers the contingent rental income is achieved. Tenant reimbursement revenue, which is comprised of additional amounts collected from tenants for the recovery of certain operating expenses, including repair and maintenance, property taxes (excluding taxes paid by a lessee directly to a third party on behalf of the lessor) and insurance, and capital expenditures, to the extent allowed pursuant to the lease (collectively, "Recoverable Expenses"), is recognized as revenue when the additional rent is due. Recoverable Expenses to be reimbursed by a tenant are determined based on the Company's estimate of the property's operating expenses for the year, pro-rated based on leased square footage of the property, and are collected in equal installments as additional rent from the tenant, pursuant to the terms of the lease. At the end of each quarter, the Company reconciles the amount of additional rent paid by the tenant during the quarter to the actual amount of the Recoverable Expenses incurred by the Company for the same period. The difference, if any, is either charged or credited to the tenant pursuant to the provisions of the lease. In certain instances, the lease may restrict the amount the Company can recover from the tenant such as a cap on certain or all property operating expenses. In a situation in which a lease associated with a significant tenant has been, or is expected to be, terminated early, or extended, the Company evaluates the remaining useful life of amortizable assets in the asset group related to the lease that will be terminated (i.e., above- and below-market lease intangibles, in-place lease value and deferred leasing costs). Based upon consideration of the facts and circumstances surrounding the termination or extension, the Company may write-off or accelerate the amortization associated with the asset group. Such amounts are included within rental and other income for above- and below-market lease intangibles and amortization for the remaining lease related asset groups in the consolidated statements of operations. Lease Accounting On January 1, 2019, the Company adopted ASC 842 using the modified retrospective approach and elected to apply the provisions as of the date of adoption on a prospective basis. Upon adoption of ASC 842, the Company elected the “package of practical expedients,” which allowed the Company to not reassess (a) whether expired or existing contracts as of January 1, 2019 are or contain leases, (b) the lease classification for any expired or existing leases as of January 1, 2019, and (c) the treatment of initial direct costs relating to any existing leases as of January 1, 2019. The package of practical expedients was made as a single election and was consistently applied to all leases that commenced before January 1, 2019. Lessor ASC 842 requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases, and operating leases. As the Company elected the package of practical expedients, the Company's existing leases as of January 1, 2019 continue to be accounted for as operating leases. Upon adoption of ASC 842, the Company elected the practical expedient permitting lessors to elect by class of underlying asset to not separate nonlease components (for example, maintenance services, including common area maintenance) from associated lease components (the “non-separation practical expedient”) if both of the following criteria are met: (1) the timing and pattern of transfer of the lease and non-lease component(s) are the same and (2) the lease component would be classified as an operating lease if it were accounted for separately. If both criteria are met, the combined component is accounted for in accordance with ASC 842 if the lease component is the predominant component of the combined component; otherwise, the combined component is accounted for in accordance with the revenue recognition standard. The Company assessed the criteria above with respect to the Company's operating leases and determined that they qualify for the non-separation practical expedient. As a result, the Company accounted for and presented all rental income earned pursuant to operating leases, including property expense recovery, as a single line item, “Rental income,” in the consolidated statement of operations for all periods presented. Prior to the adoption of ASC 842, the Company presented rental income, property expense recovery and other income related to leases separately in the Company's consolidated statements of operations. Under ASC 842, lessors are required to record revenues and expenses on a gross basis for lessor costs (which include real estate taxes) when these costs are reimbursed by a lessee. Conversely, lessors are required to record revenues and expenses on a net basis for lessor costs when they are paid by a lessee directly to a third party on behalf of the lessor. Prior to the adoption of ASC 842, the Company recorded revenues and expenses on a gross basis for real estate taxes whether they were reimbursed to the Company by a tenant or paid directly by a tenant to the taxing authorities on the Company's behalf. Effective January 1, 2019, the Company is recording these costs in accordance with ASC 842. Lessee ASC 842 requires lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset (“ROU asset”), which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. ASC 842 also requires lessees to classify leases as either finance or operating leases based on whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification is used to evaluate whether the lease expense should be recognized based on an effective interest method or on a straight-line basis over the term of the lease. On January 1, 2019, the Company was the lessee on two ground leases, which were classified as operating leases under ASC 840. As the Company elected the packages of practical expedients, the Company is not required to reassess the classification of these existing leases and, as such, these leases continue to be accounted for as operating leases. On January 1, 2019, the Company recognized ROU assets and lease liabilities for these leases on the Company's consolidated balance sheets, and on a go-forward basis, lease expense will be recognized on a straight-line basis over the remaining term of the lease. On January 1, 2019, the Company recorded a ROU asset of $25.5 million and a corresponding liability of approximately $27.6 million relating to the Company's existing ground lease arrangements. These operating leases were recognized based on the present value of the future minimum lease payments over the lease term. As these leases do not provide an implicit rate, the Company used its incremental borrowing rate based on the information available in determining the present value of future payments. The discount rate used to determine the present value of these operating leases’ future payments was 5.36%. There was no impact to beginning equity as a result of the adoption related to the lessee accounting as the difference between the asset and liability is attributed to derecognition of pre-existing straight-line rent balances. On March 1, 2019. the Company entered into an office lease located in Chicago, Illinois. The Company recorded a ROU asset of $0.6 million and a corresponding liability to the Company's lease agreements. The discount rate used to determine the present value of these operating leases’ future payments was 3.94%. On September 20, 2019, the Company acquired the McKesson II property and assumed a ground lease from the seller. The Company recorded a ROU asset of $16.3 million and a corresponding liability to the Company's existing ground lease agreements. The discount rate used to determine the present value of these operating leases’ future payments was 4.36%. Upon adoption of ASC 842, the Company also elected the practical expedient to not separate non-lease components, such as common area maintenance, from associated lease components for the Company's ground and office space leases. Derivative Instruments and Hedging Activities ASC 815, Derivatives and Hedging ("ASC 815") provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, ASC 815 requires qualitative disclosures regarding the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, the Company recorded all derivatives on the consolidated balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, and whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain risks, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. See Note 6, Interest Rate Contracts , for more detail. Income Taxes The Company has elected to be taxed as a REIT under the Internal Revenue Code ("Code"). To qualify as a REIT, the Company must meet certain organizational and operational requirements. The Company intends to adhere to these requirements and maintain its REIT status for the current year and subsequent years. As a REIT, the Company generally will not be subject to federal income taxes on taxable income that is distributed to stockholders. However, the Company may be subject to certain state and local taxes on its income and property, and federal income and excise taxes on its undistributed taxable income, if any. If the Company fails to qualify as a REIT in any taxable year, the Company will then be subject to federal income taxes on the taxable income at regular corporate rates and will not be permitted to qualify for treatment as a REIT for federal income tax purposes for four years following the year during which qualification is lost unless the Internal Revenue Service ("IRS") grants the Company relief under certain statutory provisions. Such an event could materially adversely affect net income and net cash available for distribution to stockholders. As of December 31, 2020, the Company satisfied the REIT requirements and distributed all of its taxable income. Pursuant to the Code, the Company has elected to treat its corporate subsidiary as a TRS. In general, the TRS may perform non-customary services for the Company’s tenants and may engage in any real estate or non-real estate-related business. The TRS will be subject to corporate federal and state income tax. Goodwill Goodwill represents the excess of consideration paid over the fair value of underlying identifiable net assets of business acquired. The Company's goodwill has an indeterminate life and is not amortized, but is tested for impairment on an annual basis, or more frequently if events or changes in circumstances indicate that the asset might be impaired. The Company takes a qualitative approach to consider whether an impairment of goodwill exists prior to quantitatively determining the fair value of the reporting unit in step one of the impairment test. The Company performs its annual assessment on October 1st. Use of Estimates The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the unaudited consolidated financial statements and accompanying notes. Actual results could materially differ from those estimates. Per Share Data The Company reports earnings per share for the period as (1) basic earnings per share computed by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares outstanding during the period, and (2) diluted earnings per share computed by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares outstanding, including common stock equivalents. As of December 31, 2020 and December 31, 2019, there were no material common stock equivalents that would have a dilutive effect on earnings (loss) per share for common stockholders. During the year ended December 31, 2020, the Company retroactively adjusted the number of common shares outstanding in accordance with ASC 260-10, Earnings Per Share ("ASC 260-10"). ASC 260-10 requires the computations of basic and diluted earnings per share to be adjusted retroactively for all periods presented to reflect the change in capital structure if the number of common shares outstanding increases as a result of a stock dividend or stock split or decreases as a result of a reverse stock split. If changes in common stock resulting from stock dividends, stock splits, or reverse stock splits occur after the close of the period but before the consolidated financial statements are issued or are available to be issued, the per share computations for those and any prior period consolidated financial statements presented shall be based on the new number of shares. Segment Information ASC 280, Segment Reporting, establishes standards for reporting financial and descriptive information about a public entity’s reportable segments. The Company internally evaluates all of the properties and interests therein as one reportable segment. Unaudited Data Any references to the number of buildings, square footage, number of leases, occupancy, and any amounts derived from these values in the notes to the consolidated financial statements are unaudited and outside the scope of the Company's independent registered public accounting firm's audit of its consolidated financial statements in accordance with the standards of the Public Company Accounting Oversight Board ("PCAOB"). Recently Issued Accounting Pronouncements Changes to GAAP are established by the FASB in the form of ASUs to the FASB’s Accounting Standards Codification. The Company considers the applicability and impact of all ASUs. Other than the ASUs discussed below, the FASB has not recently issued any other ASUs that the Company expects to be applicable and have a material impact on the Company's financial statements. Adoption of New Accounting Pronouncements During the first quarter of 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848). ASU 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance in ASU 2020-04 is optional and may be elected over time as reference rate reform activities occur. During the first quarter of 2020,

Real Estate

Real Estate	12 Months Ended
	Dec. 31, 2020
Real Estate [Abstract]
Real Estate	Real Estate As of December 31, 2020, the Company’s real estate portfolio consisted of 98 properties (including one land parcel held for future development), in 25 states consisting substantially of office, warehouse, and manufacturing facilities with a combined acquisition value of approximately $4.1 billion, including the allocation of the purchase price to above and below-market lease valuation. Depreciation expense for buildings and improvements for the years ended December 31, 2020, 2019, and 2018 was $94.0 million, $80.4 million, and $60.1 million, respectively. Amortization expense for intangibles, including but not limited to, tenant origination and absorption costs for the years ended December 31, 2020, 2019, and 2018 was $67.1 million, $73.0 million and $59.0 million respectively. 2020 Acquisitions The purchase price and other acquisition items for the property acquired during the year ended December 31, 2020 are shown below: Property Location Tenant/Major Lessee Acquisition Date Purchase Price Square Feet Acquisition Fees and Expenses Year of Lease Expiration Pepsi Bottling Ventures North Carolina PepsiCo 2/5/2020 $34,937 526,320 $386 2032 Real Estate - Valuation and Purchase Price Allocation The Company allocates the purchase price to the relative fair value of the tangible assets of a property by valuing the property as if it were vacant. This “as-if vacant” value is estimated using an income, or discounted cash flow, approach that relies upon Level 3 inputs, which are unobservable inputs based on the Company's review of the assumptions a market participant would use. These Level 3 inputs include discount rates, capitalization rates, market rents and comparable sales data for similar properties. Estimates of future cash flows are based on a number of factors including historical operating results, known and anticipated trends, and market and economic conditions. In calculating the “as-if vacant” value for the acquisition completed during the year ended December 31, 2020, the Company used a discount rate of 6.25%. In determining the fair value of intangible lease assets or liabilities, the Company also considers Level 3 inputs. Acquired above and below-market leases are valued based on the present value of the difference between prevailing market rates and the in-place rates measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below-market leases, if applicable. The estimated fair value of acquired in-place at-market tenant leases are the costs that would have been incurred to lease the property to the occupancy level of the property at the date of acquisition. Such estimates include the value associated with leasing commissions, legal and other costs, as well as the estimated period necessary to lease such property that would be incurred to lease the property to its occupancy level at the time of its acquisition. Acquisition costs associated with asset acquisitions are capitalized during the period they are incurred. The following summarizes the purchase price allocation of the property acquired during the year ended December 31, 2020: Property Land Building Improvements Tenant origination and absorption costs In-place lease valuation - (below) / market Debt discount / (premium) Total (1) Pepsi Bottling Ventures $3,407 $26,813 $954 $4,970 $(712) $(109) $35,323 (1) The allocations noted above are based on a determination of the relative fair value of the total consideration provided and represent the amount paid including capitalized acquisition costs. Intangibles The Company allocated a portion of the acquired and contributed real estate asset value to in-place lease valuation, tenant origination and absorption cost, and other intangibles, net of the write-off of intangibles for the years ended December 31, 2020 and 2019: December 31, 2020 2019 In-place lease valuation (above market) $ 43,576 $ 44,012 In-place lease valuation (above market) - accumulated amortization (35,604) (33,322) In-place lease valuation (above market), net 7,972 10,690 Ground leasehold interest (below market) 2,254 2,254 Ground leasehold interest (below market) - accumulated amortization (191) (164) Ground leasehold interest (below market), net 2,063 2,090 Intangible assets, net $ 10,035 $ 12,780 In-place lease valuation (below market) $ (68,334) $ (67,622) Land leasehold interest (above market) (3,072) (3,073) In-place lease valuation & land leasehold interest - accumulated amortization 44,073 38,890 Intangible liabilities, net $ (27,333) $ (31,805) Tenant origination and absorption cost $ 740,489 $ 744,773 Tenant origination and absorption cost - accumulated amortization (412,462) (354,379) Tenant origination and absorption cost, net $ 328,027 $ 390,394 The intangible assets are amortized over the remaining lease term of each property, which on a weighted-average basis, was approximately 6.83 years and 7.36 years as of December 31, 2020 and 2019, respectively. The amortization of the intangible assets and other leasing costs for the respective periods is as follows: Amortization (income) expense for the year ended December 31, 2020 2019 2018 Above and below market leases, net $ (2,292) $ (3,201) $ (685) Tenant origination and absorption cost $ 62,459 $ 69,502 $ 55,464 Ground leasehold amortization (below market) $ (291) $ (52) $ 27 Other leasing costs amortization $ 4,908 $ 3,581 $ 3,557 The following table sets forth the estimated annual amortization (income) expense for in-place lease valuation, net, tenant origination and absorption costs, ground leasehold improvements, and other leasing costs as of December 31, 2020 for the next five years: Year In-place lease valuation, net Tenant origination and absorption costs Ground leasehold improvements Other leasing costs 2021 $ (2,118) $ 57,243 $ (290) $ 5,862 2022 $ (2,518) $ 54,114 $ (290) $ 5,867 2023 $ (2,465) $ 49,551 $ (290) $ 5,739 2024 $ (1,648) $ 37,371 $ (291) $ 5,504 2025 $ (1,186) $ 26,813 $ (290) $ 5,385 Sale of Property On June 30, 2020, the Company sold the Bank of America II property located at 1800 Tapo Canyon in Simi Valley, California for total gross proceeds of $24.5 million, less closing costs and other closing credits. The carrying value of the property on the closing date was approximately $19.6 million. Upon the sale of the property, the Company recognized a gain of approximately $4.3 million. On December 22, 2020, the Company sold Bank of America I property located at 450 American Way in Simi Valley, California for total gross proceeds of $30.0 million, less closing costs and other closing credits. The carrying value of the property approximated the selling price. Impairments 2200 Channahon Road, Houston Westway I and 2275 Cabot Drive During the year ended December 31, 2020, in connection with the preparation and review of the Company's financial statements, the Company recorded an impairment provision of approximately $23.5 million as it was determined that the carrying value of the real estate would not be recoverable on three properties. This impairment resulted from changes in longer absorption periods, lower market rents and shorter anticipated hold periods. In determining the fair value of property, the Company considered Level 3 inputs. See Note 8, Fair Value Measurements , for details. Restricted Cash In conjunction with the acquisition of certain assets, as required by certain lease provisions or certain lenders in conjunction with an acquisition or debt financing, or credits received by the seller of certain assets, the Company assumed or funded reserves for specific property improvements and deferred maintenance, re-leasing costs, and taxes and insurance, which are included on the consolidated balance sheets as restricted cash. Additionally, an ongoing replacement reserve is funded by certain tenants pursuant to each tenant’s respective lease as follows: Balance as of December 31, 2020 December 31, 2019 Cash reserves $ 20,385 $ 48,129 Restricted lockbox 13,967 10,301 Total $ 34,352 $ 58,430

Investments in Unconsolidated E

Investments in Unconsolidated Entities	12 Months Ended
	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Entities	Investments in Unconsolidated Entities The interests discussed below are deemed to be variable interests in VIEs and, based on an evaluation of the variable interests against the criteria for consolidation, the Company determined that it is not the primary beneficiary of the investments, as the Company does not have power to direct the activities of the entities that most significantly affect their performance. As such, the interest in the VIEs is recorded using the equity method of accounting in the accompanying consolidated financial statements. Under the equity method, the investments in the unconsolidated entities are stated at cost and adjusted for the Company’s share of net earnings or losses and reduced by distributions. Equity in earnings of real estate ventures is generally recognized based on the allocation of cash distributions upon liquidation of the investment at book value in accordance with the operating agreements. The Company's maximum exposure to losses associated with its unconsolidated investments is primarily limited to its carrying value in the investments. Heritage Commons X, LTD In June 2018, the Company, through an SPE, wholly-owned by the GCEAR Operating Partnership, formed a joint venture ("Heritage Commons X") for the construction and ownership of a four-story Class "A" office building with a net rentable area of approximately 200,000 square feet located in Fort Worth, Texas (the "Heritage Commons Property"). The Heritage Commons Property was completed in April 2019 and is 100% leased to Mercedes-Benz Financial Services USA. On July 17, 2019, Heritage Commons X sold the Heritage Commons Property. Digital Realty Trust, Inc. In September 2014, the Company, through an SPE wholly-owned by the GCEAR Operating Partnership, acquired an 80% interest in a joint venture with an affiliate of Digital Realty Trust, Inc. ("Digital") for $68.4 million, which was funded with equity proceeds raised in the Company's public offerings. The gross acquisition value of the property was $187.5 million, plus closing costs, which was partially financed with debt of $102.0 million. The joint venture was created for purposes of directly or indirectly acquiring, owning, financing, operating and maintaining a data center facility located in Ashburn, Virginia (the "Digital Property"). The Digital Property is approximately 132,300 square feet and consists of certain data processing and communications equipment that is fully leased to a social media company and a financial services company with an average remaining lease term of approximately three years. In September 2014, the joint venture entered into a secured term loan (the "Digital Loan") in the amount of approximately $102.0 million. The Digital Loan had an original maturity date of September 9, 2019 and included two extension options of 12 additional months each beyond the original maturity date. On March 29, 2019, the joint venture executed the first 12-month loan extension. Based on the executed extension, the new loan maturity date was September 9, 2020. The extension did not change the loan amount, rate or other substantive terms. The Company had approximately $8.2 million in an outstanding letter of credit. Since the tenant did not execute a long term extension or sign a new lease with the joint venture, the joint venture elected not to accept the loan extension terms offered by the lender and subsequent discussions did not result in an additional loan extension in 2020. As a result, on September 9, 2020, the lender provided a notice of default for non-payment of the unpaid balance of the non-recourse Digital Loan and exercised its right to draw on the stand-by letter of credit. The Company funded the $8.2 million stand-by letter of credit with cash. In accordance with the terms of the Digital operating agreement, the Company holds a guaranteed minimum return such that the Digital managing member will pay an amount to the Company in order for the Company to receive a minimum 7% return on investment, subject to a cap on actual cash amounts distributed to the managing member. As part of the wind up of the joint venture, the Company has recorded a receivable from the Digital managing member of $4.1 million that it expects to receive in first quarter of 2021 and has written off its remaining investment in the venture. The Company is not exposed to any future funding obligations and there are no other future losses expected to arise from this investment. As of December 31, 2020, the balance of the investments is shown below : Digital Realty Heritage Commons X Total Balance as of December 31, 2019 $ 10,584 $ 444 $ 11,028 Net loss (164) — (164) Distributions (8,121) (410) (8,531) Contributions 8,160 — 8,160 Valuation adjustment (1) (4,453) — (4,453) Impairment (2) (1,906) — (1,906) Clawback receivable reclass (3) (4,100) — (4,100) Balance as of December 31, 2020 $ — $ 34 $ 34 (1) Amount represents a charge to arrive at the net realizable value as of December 31, 2020, which is included in the line item "(Loss) Gain from investment in unconsolidated entities" in the consolidated statement of operations. (2) Amount represents an impairment on the Company's Digital investment that the Company determined in connection with the preparation and review of the financial statements. Amount included in the line item "(Loss) Gain from investment in unconsolidated entities" in the consolidated statement of operations. (3) Amount represents a reclass of the clawback to other assets as disclosed above.

Debt

Debt	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Debt	Debt As of December 31, 2020 and December 31, 2019, the Company’s debt consisted of the following: December 31, Contractual Interest Rate (1) Loan Effective Interest Rate (2) 2020 2019 HealthSpring Mortgage Loan $ 20,208 $ 20,723 4.18% April 2023 4.62% Midland Mortgage Loan 98,155 100,249 3.94% April 2023 4.12% Emporia Partners Mortgage Loan 1,627 2,104 5.88% September 2023 5.96% Samsonite Loan 20,165 21,154 6.08% September 2023 5.09% Highway 94 Loan 14,689 15,610 3.75% August 2024 4.80% Pepsi Bottling Ventures Loan 18,587 — 3.69% October 2024 3.92% AIG Loan II 126,792 126,970 4.15% November 2025 4.93% BOA Loan 375,000 375,000 3.77% October 2027 3.91% BOA/KeyBank Loan 250,000 250,000 4.32% May 2028 4.14% AIG Loan 103,870 105,762 4.96% February 2029 5.08% Total Mortgage Debt 1,029,093 1,017,572 Revolving Credit Facility (3) 373,500 211,500 LIBO Rate + 1.60% June 2023 1.88% 2023 Term Loan 200,000 200,000 LIBO Rate + 1.55% June 2023 1.80% 2024 Term Loan 400,000 400,000 LIBO Rate + 1.55% April 2024 1.79% 2026 Term Loan 150,000 150,000 LIBO Rate + 1.85% April 2026 2.06% Total Debt 2,152,593 1,979,072 Unamortized Deferred Financing Costs and Discounts, net (12,166) (9,968) Total Debt, net $ 2,140,427 $ 1,969,104 (1) Including the effect of the interest rate swap agreements with a total notional amount of $750 million the weighted average interest rate as of December 31, 2020 was 3.58% for both the Company’s fixed-rate and variable-rate debt combined and 3.96% for the Company’s fixed-rate debt only. (2) Reflects the effective interest rate as of December 31, 2020 and includes the effect of amortization of discounts/premiums and deferred financing costs. (3) The LIBO rate as of December 1, 2020 (effective date) was 0.16%. The Revolving Credit Facility has an initial term of approximately two years, maturing on June 28, 2022, and may be extended for a one-year period if certain conditions are met and upon payment of an extension fee. See discussion below. Second Amended and Restated Credit Agreement Pursuant to the Second Amended and Restated Credit Agreement dated as of April 30, 2019 (as amended by the First Amendment to the Second Amended and Restated Credit Agreement dated as of October 1, 2020 and the Second Amendment to Second Amended and Restated Credit Agreement dated as of December 18, 2020, the “Second Amended and Restated Credit Agreement”), with KeyBank, as administrative agent, and a syndicate of lenders, we, through the GCEAR Operating Partnership, as the borrower, have been provided with a $1.9 billion credit facility consisting of a $750 million senior unsecured revolving credit facility (the “Revolving Credit Facility”) maturing in June 2022 with (subject to the satisfaction of certain customary conditions) a one-year extension option, a $200 million senior unsecured term loan maturing in June 2023 (the “$200M 5-Year Term Loan”), a $150 million senior unsecured term loan maturing in April 2026 (the “$150M 7-Year Term Loan”), a $400 million senior unsecured term loan maturing in April 2024 (the “$400M 5-Year Term Loan”) and a delayed draw $400 million senior unsecured term loan maturing in December 2025 (the “Delayed Draw $400M 5-Year Term Loan”) (collectively, the “KeyBank Loans”). The credit facility also provides the option, subject to obtaining additional commitments from lenders and certain other customary conditions, to increase the commitments under the Revolving Credit Facility, increase the existing term loans and/or incur new term loans by up to an additional $600 million in the aggregate. As of December 31, 2020, the remaining capacity under the Revolving Credit Facility was $221.9 million and the Delayed Draw $400M 5-Year Term Loan was undrawn. Based on the terms as of December 31, 2020, the interest rate for the credit facility varies based on the consolidated leverage ratio of the GCEAR Operating Partnership, us, and our subsidiaries and ranges (a) in the case of the Revolving Credit Facility, from LIBOR plus 1.30% to LIBOR plus 2.20%, (b) in the case of each of the $200M 5-Year Term Loan, the $400M 5-Year Term Loan and the Delayed Draw $400M 5-Year Term Loan, from LIBOR plus 1.25% to LIBOR plus 2.15% and (c) in the case of the $150M 7-Year Term Loan, from LIBOR plus 1.65% to LIBOR plus 2.50%. If the GCEAR Operating Partnership obtains an investment grade rating of its senior unsecured long term debt from Standard & Poor's Rating Services, Moody's Investors Service, Inc., or Fitch, Inc., the applicable LIBOR margin and base rate margin will vary based on such rating and range (i) in the case of the Revolving Credit Facility, from LIBOR plus 0.825% to LIBOR plus 1.55%, (ii) in the case of each of the $200M 5-Year Term Loan, the $400M 5-Year Term Loan and the Delayed Draw $400M 5-Year Term Loan, from LIBOR plus 0.90% to LIBOR plus 1.75% and (iii) in the case of the $150M 7-Year Term Loan, from LIBOR plus 1.40% to LIBOR plus 2.35%. In the event that any of the 2025 Term Loan is not advanced as of the date that is 120 days after December 18, 2020, such unadvanced amount will incur an unused fee equal to 0.20% annually multiplied by the average daily amount of the unadvanced portion of the 2025 Term Loan. Such unused fee will be payable quarterly in arrears and will start accruing on the date that is 120 days after December 18, 2020 and will stop accruing on the first to occur of (a) the date the 2025 Term Loan is fully advanced, (b) the date that is 180 days after December 18, 2020, or (c) the date the GCEAR Operating Partnership, as borrower, terminates any remaining portion of the 2025 Term Loan. The Second Amended and Restated Credit Agreement provides that the GCEAR Operating Partnership must maintain a pool of unencumbered real properties (each a "Pool Property" and collectively the "Pool Properties") that meet certain requirements contained in the Second Amended and Restated Credit Agreement. The agreement sets forth certain covenants relating to the Pool Properties, including, without limitation, the following: • there must be no less than 15 Pool Properties at any time; • no greater than 15% of the aggregate pool value may be contributed by a single Pool Property or tenant; • no greater than 15% of the aggregate pool value may be contributed by Pool Properties subject to ground leases; • no greater than 20% of the aggregate pool value may be contributed by Pool Properties which are under development or assets under renovation; • the minimum aggregate leasing percentage of all Pool Properties must be no less than 90%; and • other limitations as determined by KeyBank upon further due diligence of the Pool Properties. Borrowing availability under the Second Amended and Restated Credit Agreement is limited to the lesser of the maximum amount of all loans outstanding that would result in (i) an unsecured leverage ratio of no greater than 60%, or (ii) an unsecured interest coverage ratio of no less than 2.00:1.00. Guarantors of the KeyBank Loans include the Company, each special purpose entity that owns a Pool Property, and each of the GCEAR Operating Partnership's other subsidiaries which owns a direct or indirect equity interest in a special purpose entity that owns a Pool Property. In addition to customary representations, warranties, covenants, and indemnities, the KeyBank Loans require the GCEAR Operating Partnership to comply with the following at all times, which will be tested on a quarterly basis: • a maximum consolidated leverage ratio of 60%, or, the ratio may increase to 65% for up to four consecutive quarters after a material acquisition; • a minimum consolidated tangible net worth of 75% of the Company's consolidated tangible net worth at closing of the Revolving Credit Facility, or approximately $2.0 billion, plus 75% of net future equity issuances (including GCEAR OP Units ), minus 75% of the amount of any payments used to redeem the Company's stock or OP Units, minus any amounts paid for the redemption or retirement of or any accrued return on the preferred equity issued under the preferred equity investment made in EA-1 in August 2018 by SHBNPP Global Professional Investment Type Private Real Estate Trust No. 13 (H); • upon consummation, if ever, of an initial public offering, a minimum consolidated tangible net worth of 75% of the Company's consolidated tangible net worth at the time of such initial public offering plus 75% of net future equity issuances (including GCEAR OP Units) should the Company publicly list its shares; • a minimum consolidated fixed charge coverage ratio of not less than 1.50:1.00; • a maximum total secured debt ratio of not greater than 40%, which ratio will increase by five percentage points for four quarters after closing of a material acquisition that is financed with secured debt; • a minimum unsecured interest coverage ratio of 2.00:1.00; • a maximum total secured recourse debt ratio, excluding recourse obligations associated with interest rate hedges, of 10% of our total asset value; and • aggregate maximum unhedged variable rate debt of not greater than 30% of the Company's total asset value. Furthermore, the activities of the GCEAR Operating Partnership, the Company, and the Company's subsidiaries must be focused principally on the ownership, development, operation and management of office, industrial, manufacturing, warehouse, distribution or educational properties (or mixed uses thereof) and businesses reasonably related or ancillary thereto. Debt Covenant Compliance Pursuant to the terms of the Company's mortgage loans and the KeyBank Loans, the GCEAR Operating Partnership, in consolidation with the Company, is subject to certain loan compliance covenants. The Company was in compliance with all of its debt covenants as of December 31, 2020. The following summarizes the future scheduled principal repayments of all loans as of December 31, 2020 per the loan terms discussed above: As of December 31, 2020 2021 $ 9,587 2022 10,216 2023 337,387 2024 433,921 2025 120,111 Thereafter 1,241,371 Total principal 2,152,593 Unamortized debt premium/(discount) (577) Unamortized deferred loan costs (11,589) Total $ 2,140,427

Interest Rate Contracts

Interest Rate Contracts	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Interest Rate Contracts	Interest Rate Contracts Risk Management Objective of Using Derivatives The Company is exposed to certain risks arising from both business operations and economic conditions. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of debt funding and the use of derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposures that arise from business activities that result in the payment of future known and uncertain cash amounts, the values of which are determined by expected cash payments principally related to borrowings and interest rates. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The Company does not use derivatives for trading or speculative purposes. Derivative Instruments On July 9, 2015, the Company executed one interest rate swap agreement to hedge the variable cash flows associated with LIBOR. The interest rate swap was effective for the period from July 9, 2015 to July 1, 2020 with a notional amount of $425.0 million, which matured during the third quarter of 2020. On August 31, 2018, the Company executed four interest rate swap agreements to hedge future variable cash flows associated with LIBOR. The forward-starting interest rate swaps with a total notional amount of $425.0 million became effective on July 1, 2020 and have a term of five years. On March 10, 2020, the Company entered into three interest rate swap agreements to hedge variable cash flows associated with LIBOR. The swap agreements became effective on March 10, 2020, and have a term of approximately five years with notional amounts of $150.0 million, $100.0 million and $75.0 million, respectively. The Company also has entered into interest rate swap agreements to hedge the variable cash flows associated with certain existing or forecasted LIBOR based variable-rate debt, including the Company's KeyBank Loans. The change in the fair value of derivatives designated and qualifying as cash flow hedges is initially recorded in accumulated other comprehensive income ("AOCI") and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. Amounts reported in AOCI related to derivatives will be reclassified to interest expense as interest payments are made on the Company's variable-rate debt. The following table sets forth a summary of the interest rate swaps at December 31, 2020 and 2019: Fair Value (1) Current Notional Amounts December 31, December 31, Derivative Instrument Effective Date Maturity Date Interest Strike Rate 2020 2019 2020 2019 (Liabilities) Interest Rate Swap 3/10/2020 7/1/2025 0.83% $ (2,963) $ — $ 150,000 $ — Interest Rate Swap 3/10/2020 7/1/2025 0.84% (2,023) — 100,000 — Interest Rate Swap 3/10/2020 7/1/2025 0.86% (1,580) — 75,000 — Interest Rate Swap 7/1/2020 7/1/2025 2.82% (13,896) (7,038) 125,000 125,000 Interest Rate Swap 7/1/2020 7/1/2025 2.82% (11,140) (5,651) 100,000 100,000 Interest Rate Swap 7/1/2020 7/1/2025 2.83% (11,148) (5,665) 100,000 100,000 Interest Rate Swap 7/1/2020 7/1/2025 2.84% (11,225) (5,749) 100,000 100,000 Interest Rate Swap 7/9/2015 7/1/2020 1.69% — (43) — 425,000 Total $ (53,975) $ (24,146) $ 750,000 $ 850,000 (1) The Company records all derivative instruments on a gross basis in the consolidated balance sheets, and accordingly there are no offsetting amounts that net assets against liabilities. As of December 31, 2020, derivatives in a liability position are included in the line item "Interest rate swap liability" in the consolidated balance sheets at fair value. The following table sets forth the impact of the interest rate swaps on the consolidated statements of operations for the periods presented: Year Ended December 31, 2020 2019 Interest Rate Swap in Cash Flow Hedging Relationship: Amount of (loss) gain recognized in AOCI on derivatives $ (38,319) $ (19,944) Amount of (gain) loss reclassified from AOCI into earnings under “Interest expense” $ 8,615 $ (2,359) Total interest expense presented in the consolidated statement of operations in which the effects of cash flow hedges are recorded $ 79,646 $ 73,557 During the twelve months subsequent to December 31, 2020, the Company estimates that an additional $13.8 million of its expense will be recognized from AOCI into earnings. Certain agreements with the derivative counterparties contain a provision that if the Company defaults on any of its indebtedness, including a default where repayment of the indebtedness has not been accelerated by the lender within a specified time period, then the Company could also be declared in default on its derivative obligations.

Accrued Expenses and Other Liab

Accrued Expenses and Other Liabilities	12 Months Ended
	Dec. 31, 2020
Payables and Accruals [Abstract]
Accrued Expenses and Other Liabilities	Accrued Expenses and Other Liabilities Accrued expenses and other liabilities consisted of the following as of December 31, 2020 and 2019: December 31, 2020 2019 Accrued tenant improvements $ 30,011 $ 11,802 Prepaid tenant rent 20,780 20,510 Real estate taxes payable 15,380 13,385 Deferred compensation 10,599 9,209 Interest payable 9,147 12,264 Property operating expense payable 8,473 7,752 Other liabilities 20,044 21,467 Total $ 114,434 $ 96,389

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company is required to disclose fair value information about all financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practicable to estimate fair value. The Company measures and discloses the estimated fair value of financial assets and liabilities utilizing a fair value hierarchy that distinguishes between data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions. This hierarchy consists of three broad levels, as follows: (i) quoted prices in active markets for identical assets or liabilities, (ii) "significant other observable inputs," and (iii) "significant unobservable inputs." "Significant other observable inputs" can include quoted prices for similar assets or liabilities in active markets, as well as inputs that are observable for the asset or liability, such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. "Significant unobservable inputs" are typically based on an entity’s own assumptions, since there is little, if any, related market activity. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. The Company's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. There were no transfers between the levels in the fair value hierarchy during the years ended December 31, 2020 and 2019. The following table sets forth the assets and liabilities that the Company measures at fair value on a recurring basis by level within the fair value hierarchy as of December 31, 2020 and 2019: Assets/(Liabilities) Total Fair Value Quoted Prices in Active Markets for Identical Assets and Liabilities Significant Other Observable Inputs Significant Unobservable Inputs December 31, 2020 Interest Rate Swap Liability $ (53,975) $ — $ (53,975) $ — Corporate Owned Life Insurance Asset $ 4,454 $ — $ 4,454 $ — Mutual Funds Asset $ 6,643 $ 6,643 $ — $ — Deferred Compensation Liability $ (10,599) $ — $ (10,599) $ — December 31, 2019 Interest Rate Swap Liability $ (24,146) $ — $ (24,146) $ — Earn-out Liability (due to affiliates) $ (2,919) $ — $ — $ (2,919) Corporate Owned Life Insurance Asset $ 2,134 $ — $ 2,134 $ — Mutual Funds Asset $ 6,983 $ 6,983 $ — $ — Deferred Compensation Liability $ (9,209) $ — $ (9,209) $ — Earn-outs The Current Operating Partnership will pay GCC in cash earn-out consideration ("Cash Earn-Out") equal to (i) 37.25% of the amounts received by the Company's advisor as advisory fees pursuant to the Company's advisory agreement with respect to the incremental common equity invested in the Company's follow-on public offering from April 30, 2019 through the September 20, 2020 (termination of the follow-on offering) plus (ii) 37.25% of the amounts that would have been received by the Company's advisor as performance distributions pursuant to the Current Operating Partnership agreement of the Current Operating Partnership with respect to assets acquired by the Company from April 30, 2019 through September 20, 2020. The Cash Earn-Out consideration will accrue on an ongoing basis and be paid quarterly; provided that such cash earn-out consideration will in no event exceed an amount equal to 2.5% of the aggregate dollar amount of common equity invested in the Company pursuant to its follow-on public offering from April 30, 2019 through September 20, 2020. The Company estimated the fair value of the Cash Earn-Out liability using a discounted cash flow. The estimate required the Company to make various assumptions about future equity raised, capitalization rates and annual net operating income growth prior to the termination of the follow-on offering. During the year ended ended December 31, 2020, the Company recorded an adjustment of approximately $2.6 million, which is included in "Other income, net" on the consolidated statement of operations as a reduction of the Company's liability. As of December 31, 2020, the liability is approximately $0.3 million. Since the follow-on offering terminated on September 20, 2020, the liability is based on actual amounts raised during the offering. The Company has made one payment of approximately $0.1 million as of December 31, 2020. Real Estate For the year ended December 31, 2020, in connection with the preparation and review of the Company's financial statements, the Company determined that three of the Company's properties were impaired based upon discounted cash flow analyses where the most significant inputs were the market rental rates, terminal capitalization rate, discount rate and expected hold period. The Company considered these inputs as Level 3 measurements within the fair value hierarchy. The following table is a summary of the quantitative information related to the non-recurring fair value measurement for the impairment of the Company's real estate properties for the year-ended December 31, 2020: Range of Inputs or Inputs Unobservable Inputs: 2200 Channahon Road Houston Westway I 2275 Cabot Drive Market rent per square foot $2.00 to $3.00 $15.00 to $17.00 $11.00 to $12.00 Terminal capitalization rate 9.75% 7.75% 9.00% Discount rate 14.00% 9.00% 10.25% Financial Instruments Disclosed at Fair Value Financial instruments as of December 31, 2020 and December 31, 2019 consisted of cash and cash equivalents, restricted cash, accounts receivable, accrued expenses and other liabilities, and mortgage payable and other borrowings, as defined in Note 5, Debt . With the exception of the mortgage loans in the table below, the amounts of the financial instruments presented in the consolidated financial statements substantially approximate their fair value as of December 31, 2020 and December 31, 2019. The fair value of the ten mortgage loans in the table below is estimated by discounting each loan’s principal balance over the remaining term of the mortgage using current borrowing rates available to the Company for debt instruments with similar terms and maturities. The Company determined that the mortgage debt valuation in its entirety is classified in Level 2 of the fair value hierarchy, as the fair value is based on current pricing for debt with similar terms as the in-place debt. December 31, 2020 December 31, 2019 Fair Value Carrying Value (1) Fair Value Carrying Value (1) BOA Loan $ 355,823 $ 375,000 $ 369,343 $ 375,000 BOA/KeyBank Loan $ 263,454 $ 250,000 $ 264,101 $ 250,000 AIG Loan II $ 121,011 $ 126,792 $ 122,258 $ 126,970 AIG Loan $ 102,033 $ 103,870 $ 101,663 $ 105,762 Midland Mortgage Loan $ 97,709 $ 98,155 $ 99,318 $ 100,249 Samsonite Loan $ 21,030 $ 20,165 $ 22,103 $ 21,154 HealthSpring Mortgage Loan $ 20,462 $ 20,208 $ 20,868 $ 20,723 Pepsi Bottling Ventures Loan $ 18,942 $ 18,587 $ — $ — Highway 94 Loan $ 14,447 $ 14,689 $ 15,101 $ 15,610 Emporia Partners Mortgage Loan $ 1,654 $ 1,627 $ 2,105 $ 2,104 (1) The carrying values do not include the debt premium/(discount) or deferred financing costs as of December 31, 2020 and December 31, 2019. See Note 5, Debt

Equity

Equity	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Equity	Equity Classes Class T shares, Class S shares, Class D shares, Class I shares, Class A shares, Class AA shares, Class AAA and Class E shares vote together as a single class, and each share is entitled to one vote on each matter submitted to a vote at a meeting of the Company's stockholders; provided that with respect to any matter that would only have a material adverse effect on the rights of a particular class of common stock, only the holders of such affected class are entitled to vote . As of December 31, 2020, there were 558,107 shares of Class T common stock, 1,800 shares of Class S common stock, 41,095 shares of Class D common stock, 1,896,696 shares of Class I common stock, 24,325,680 shares of Class A common stock, 47,304,097 of Class AA common stock, 920,920 shares of Class AAA common stock, and 155,272,273 of Class E common stock outstanding. Common Equity As of December 31, 2020, the Company had received aggregate gross offering proceeds of approximately $2.8 billion from the sale of shares in the private offering, the public offerings, the DRP offerings and mergers (includes EA-1 offerings and EA-1 merger with Signature Office REIT, Inc. and the EA Merger) , as discussed in Note 1, Organization . As part of the $2.8 billion from the sale of shares, the Company issued approximately 43,772,611 shares of its common stock upon the consummation of the merger of Signature Office REIT, Inc. in June 2015 and 174,981,547 Class E shares (in exchange for all outstanding shares of EA-1's common stock at the time of the EA Merger) in April 2019 upon the consummation of the EA Merger. As of December 31, 2020, there were 230,320,668 shares outstanding, including shares issued pursuant to the DRP, less shares redeemed pursuant to the SRP and the self-tender offer, which occurred in May 2019. Termination of Follow-On Offering On February 26, 2020, the Company’s Board of Directors (the “Board”) approved the temporary suspension of the primary portion of the Company’s follow-on offering of up to $2.2 billion of shares, consisting of up to $2.0 billion of shares in our primary offering and $0.2 billion of shares pursuant to our DRP (the “Follow-On Offering”), effective February 27, 2020. The Follow-On Offering terminated with the expiration of the registration statement on Form S-11 (Registration No. 333-217223), as amended, on September 20, 2020. Distribution Reinvestment Plan (DRP) The Company has adopted the DRP, which allows stockholders to have dividends and other distributions otherwise distributable to them invested in additional shares of common stock. No sales commissions or dealer manager fees will be paid on shares sold through the DRP, but the DRP shares will be charged the applicable distribution fee payable with respect to all shares of the applicable class. The purchase price per share under the DRP is equal to the net asset value ("NAV") per share applicable to the class of shares purchased, calculated using the most recently published NAV available at the time of reinvestment. The Company may amend or terminate the DRP for any reason at any time upon 10 days' prior written notice to stockholders, which may be provided through the Company's filings with the SEC. In connection with a potential strategic transaction, on February 26, 2020, the Board approved the temporary suspension of the DRP, effective March 8, 2020. On July 16, 2020, the Board approved the reinstatement of the DRP, effective July 27, 2020 and an amendment of the DRP to allow for the use of the most recently published NAV per share of the applicable share class available at the time of reinvestment as the DRP purchase price for each share class. On July 17, 2020, the Company filed a registration statement on Form S-3 for the registration of up to $100 million in shares pursuant to the Company's DRP (the “DRP Offering”). The DRP Offering may be terminated at any time upon 10 days’ prior written notice to stockholders. As of December 31, 2020, the Company sold 32,978,545 shares for approximately $318.2 million in the Company's DRP offerings. The following table summarizes the DRP offerings ,by share class, as of December 31, 2020: Share Class Amount Shares Class A 6,923 743,349 Class AA 13,695 1,470,340 Class AAA 207 22,190 Class D 12 1,312 Class E 296,930 30,697,419 Class I 300 31,992 Class S 0 12 Class T 112 11,931 Total $ 318,179 32,978,545 As of December 31, 2020 and December 31, 2019, the Company had issued approximately $318.2 million and $293.7 million in shares pursuant to the DRP, respectively. Share Redemption Program (SRP) The Company has adopted the SRP that enables stockholders to sell their stock to the Company in limited circumstances. On August 8, 2019, the Company's Board amended and restated its SRP, effective as of September 12, 2019, in order to (i) clarify that only those stockholders who purchased their shares from us or received their shares from the Company (directly or indirectly) through one or more non-cash transactions (including transfers to trusts, family members, etc.) may participate in the SRP; (ii) allocate capacity within each class of common stock such that the Company may redeem up to 5% of t he aggregate NAV of each class of common stock; (iii) treat all unsatisfied redemption requests (or portion thereof) as a request for redemption the following quarter unless otherwise withdrawn; and (iv) make certain other clarifying changes. On November 7, 2019, the Board amended and restated the SRP, effective as of December 12, 2019, in order to (i) provide for redemption sought upon a stockholder’s determination of incompetence or incapacitation; (ii) clarify the circumstances under which a determination of incompetence or incapacitation will entitle a stockholder to such redemption; and (iii) make certain other clarifying changes. In connection with a potential strategic transaction, on February 26, 2020, the Board approved the temporary suspension of the SRP, effective March 28, 2020. On July 16, 2020, the Board approved the partial reinstatement of the SRP, effective August 17, 2020, subject to the following limitations: (A) redemptions will be limited to those sought upon a stockholder’s death, qualifying disability, or determination of incompetence or incapacitation in accordance with the terms of the SRP, and (B) the quarterly cap on aggregate redemptions will be equal to the aggregate NAV, as of the last business day of the previous quarter, of the shares issued pursuant to the DRP during such quarter. Settlements of share redemptions will be made within the first three business days of the following quarter. Redemption activity during the quarter is listed below. Under the SRP, the Company will redeem shares as of the last business day of each quarter. The redemption price will be equal to the NAV per share for the applicable class generally on the 13th day of the month prior to quarter end (which will be the most recently published NAV). Redemption requests must be received by 4:00 p.m. (Eastern time) on the second to last business day of the applicable quarter. Redemption requests exceeding the quarterly cap will be filled on a pro rata basis. With respect to any pro rata treatment, redemption requests following the death or qualifying disability of a stockholder will be considered first, as a group, followed by requests where pro rata redemption would result in a stockholder owning less than the minimum balance of $2,500 of shares of the Company's common stock, which will be redeemed in full to the extent there are available funds, with any remaining available funds allocated pro rata among all other redemption requests. All unsatisfied redemption requests must be resubmitted after the start of the next quarter, or upon the recommencement of the SRP, as applicable. There are several restrictions under the SRP. Stockholders generally must hold their shares for one year before submitting their shares for redemption under the program; however, the Company will waive the one-year holding period in the event of the death or qualifying disability of a stockholder. Shares issued pursuant to the DRP are not subject to the one-year holding period. In addition, the SRP generally imposes a quarterly cap on aggregate redemptions of the Company's shares equal to a value of up to 5% of the aggregate NAV of the outstanding shares as of the last business day of the previous quarter, subject to the further limitations as indicated in the August 8, 2019 amendments discussed above. As the value on the aggregate redemptions of the Company's shares is outside the Company's control, the 5% quarterly cap is considered to be temporary equity and is presented as common stock subject to redemption on the accompanying consolidated balance sheets. The following table summarizes share redemption (excluding the self-tender offer) activity during the years ended December 31, 2020 and 2019: Year Ended December 31, 2020 2019 Shares of common stock redeemed 1,841,887 20,933,322 Weighted average price per share $ 9.01 $ 9.44 Since July 31, 2014 and through December 31, 2020, the Company had redeemed 26,072,452 shares (excluding the self-tender offer) of common stock for approximately $245.3 million at a weighted average price per share of $9.41 pursuant to the SRP. Since July 31, 2014 and through December 31, 2019, the Company had honored all outstanding redemption requests. During the three months ended September 30, 2019, redemption requests for Class E shares exceeded the quarterly 5% per share class limitation by 2,872,488 shares or approximately $27.4 million. The Class E shares not redeemed during that quarter, or 25% of the shares submitted, were treated as redemption requests for the quarter ended December 31, 2019. All outstanding requests for the quarter ended September 30, 2019 and all new requests for the quarter ended December 31, 2019 were honored on January 2, 2020. Redemptions sought upon a stockholder's death, qualifying disability, or determination of incompetence or incapacitation in the first quarter of 2020 were honored in accordance with the terms of the SRP, and the SRP officially was suspended as of March 28, 2020 for regular redemptions and subsequent redemptions for death, qualifying disability, or determination of incompetence or incapacitation after those honored in the first quarter of 2020. As described above, the SRP was partially reinstated, effective August 17, 2020, for redemptions sought upon a stockholder’s death, qualifying disability, or determination of incompetence or incapacitation in accordance with the terms of the SRP, subject to a quarterly cap on aggregate redemptions equal to the aggregate NAV, as of the last business day of the previous quarter, of the shares issued pursuant to the DRP during such quarter. During the year ended December 31, 2020, the Company received redemption requests (including those due to death, disability or incapacitation) for 600,075 shares of common stock that were all redeemed during and subsequent to the current quarter. Series A Preferred Shares On August 8, 2018, EA-1 entered into a purchase agreement (the "Purchase Agreement") with SHBNPP Global Professional Investment Type Private Real Estate Trust No. 13(H) (acting through Kookmin Bank as trustee) (the "Purchaser") and Shinhan BNP Paribas Asset Management Corporation, as an asset manager of the Purchaser, pursuant to which the Purchaser agreed to purchase an aggregate of 10,000,000 shares of EA-1 Series A Cumulative Perpetual Convertible Preferred Stock at a price of $25.00 per share (the "EA-1 Series A Preferred Shares") in two tranches, each comprising 5,000,000 EA-1 Series A Preferred Shares. On August 8, 2018 (the "First Issuance Date"), EA-1 issued 5,000,000 Series A Preferred Shares to the Purchaser for a total purchase price of $125.0 million (the "First Issuance"). EA-1 paid transaction fees totaling 3.5% of the First Issuance purchase price and incurred approximately $0.4 million in transaction-related expenses to unaffiliated third parties. EA-1's former external advisor incurred transaction-related expenses of approximately $0.2 million, which was reimbursed by EA-1. Upon consummation of the Mergers, the Company issued 5,000,000 Series A Preferred Shares to the Purchaser. Pursuant to the Purchase Agreement, the Purchaser has agreed to purchase an additional 5,000,000 Series A Preferred Shares (the "Second Issuance") at a later date (the "Second Issuance Date") for an additional purchase price of $125.0 million subject to approval by the Purchaser’s internal investment committee and the satisfaction of certain conditions set forth in the Purchase Agreement. Pursuant to the Purchase Agreement, the Purchaser is generally restricted from transferring the Series A Preferred Shares or the economic interest in the Series A Preferred Shares for a period of five years from the applicable closing date. The Company's Series A Preferred Shares are not registered under the Securities Act and are not listed on a national securities exchange. The articles supplementary filed by the Company related to the Series A Preferred Shares set forth the key terms of such shares as follows: Distributions Subject to the terms of the applicable articles supplementary, the holders of the Series A Preferred Shares are entitled to receive distributions quarterly in arrears at a rate equal to one-fourth (1/4) of the applicable varying rate, as follows: i. 6.55% from and after the First Issuance Date, or if the Second Issuance occurs, 6.55% from and after the Second Issuance Date until the five five ii. 6.75% from and after the Reset Date, subject to paragraphs (iii) and (iv) below; iii. if a listing of the Company's shares of Class E Common Stock or the Series A Preferred Shares on a national securities exchange registered under Section 6(a) of the Exchange Act, does not occur by August 1, 2020 (the “First Triggering Event”), 7.55% from and after August 2, 2020 and 7.75% from and after the Reset Date, subject to (iv) below and certain conditions as set forth in the articles supplementary; or iv. if such a listing does not occur by August 1, 2021, 8.05% from and after August 2, 2021 until the Reset Date, and 8.25% from and after the Reset Date. Liquidation Preference Upon any voluntary or involuntary liquidation, dissolution or winding up of the Company, the holders of the Series A Preferred Shares will be entitled to be paid out of the Company's assets legally available for distribution to the stockholders, after payment of or provision for the Company's debts and other liabilities, liquidating distributions, in cash or property at its fair market value as determined by the Company's Board, in the amount, for each outstanding Series A Preferred Share equal to $25.00 per Series A Preferred Share (the "Liquidation Preference"), plus an amount equal to any accumulated and unpaid distributions to the date of payment, before any distribution or payment is made to holders of shares of common stock or any other class or series of equity securities ranking junior to the Series A Preferred Shares but subject to the preferential rights of holders of any class or series of equity securities ranking senior to the Series A Preferred Shares. After payment of the full amount of the Liquidation Preference to which they are entitled, plus an amount equal to any accumulated and unpaid distributions to the date of payment, the holders of Series A Preferred Shares will have no right or claim to any of the Company's remaining assets. Company Redemption Rights The Series A Preferred Shares may be redeemed by the Company, in whole or in part, at the Company's option, at a per share redemption price in cash equal to $25.00 per Series A Preferred Share (the "Redemption Price"), plus any accumulated and unpaid distributions on the Series A Preferred Shares up to the redemption date, plus, a redemption fee of 1.5% of the Redemption Price in the case of a redemption that occurs on or after the date of the First Triggering Event, but before the date that is five years from the First Issuance Date. Holder Redemption Rights In the event the Company fails to effect a listing of the Company’s shares of common stock or Series A Preferred Shares by August 1, 2023, the holder of any Series A Preferred Shares has the option to request a redemption of such shares on or on any date following August 1, 2023, at the Redemption Price, plus any accumulated and unpaid distributions up to the redemption date (the "Redemption Right"); provided, however, that no holder of the Series A Preferred Shares shall have a Redemption Right if such a listing occurs prior to or on August 1, 2023. Conversion Rights Subject to the Company's redemption rights and certain conditions set forth in the articles supplementary, a holder of the Series A Preferred Shares, at his or her option, will have the right to convert such holder's Series A Preferred Shares into shares of the Company's common stock any time after the earlier of (i) five years from the First Issuance Date, or if the Second Issuance occurs, five years from the Second Issuance Date or (ii) a Change of Control (as defined in the articles supplementary) at a per share conversion rate equal to the Liquidation Preference divided by the then Common Stock Fair Market Value (as defined in the articles supplementary). Issuance of Restricted Stock Units to Executive Officers and Employees On May 1, 2019, the Company issued 1,009,415 restricted stock units ("2019 RSUs") to the Company's officers under the Griffin Capital Essential Asset REIT, Inc. Employee and Director Long-Term Incentive Plan (as amended, the "LTIP") Each 2019 RSU represents a contingent right to receive one share of the Company’s Class E common stock when settled in accordance with the terms of the respective restricted stock unit award agreement and will vest in equal, 25% installments on each of December 31, 2019, 2020, 2021 and 2022, provided that such executive officer remains continuously employed by the Company on each such date, subject to certain accelerated vesting provisions as provided in the restricted stock unit award agreements. The shares of Class E common stock underlying the 2019 RSUs will not be delivered upon vesting, but instead will be deferred for delivery on May 1, 2023, or, if sooner, upon the executive officer's termination of employment. The fair value of grants issued was approximately $9.7 million. As of December 31, 2020, there was $4.5 million of unrecognized compensation expense remaining over two years. On January 15, 2020, the Company issued 589,248 restricted stock units ("2020 RSUs") to Company employees, including officers, under the Griffin Capital Essential Asset REIT, Inc. Employee and LTIP. Each 2020 RSU represents a contingent right to receive one share of the Company’s Class E common stock when settled in accordance with the terms of the respective restricted stock award agreement. The remaining scheduled to vest in equal, 25% installments on each of December 31, 2021, 2022 and 2023 provided that the employee continues to be employed by the Company on each such date, subject to certain accelerated vesting provisions as provided in the respective restricted stock unit award agreement. The fair value of grants issued was approximately $5.5 million. Forfeitures on the Company's restricted stock units are recognized as they occur. As of December 31, 2020, there was $3.6 million of unrecognized compensation expense remaining over three years. Total compensation expense for the year ended December 31, 2020 and 2019 was approximately $5.2 million and $2.4 million, respectively. In December 2020, the Company accrued for the accelerating the vesting of restricted stock units to a former executive as part of his resignation. The acceleration resulted in $1.4 million of compensation expense. The restricted stock units vested in February 2021. Number of Unvested Shares of Restricted Stock Awards Weighted-Average Grant Date Fair Value per Share Balance at December 31, 2018 — $ — Granted 1,009,415 $ 9.56 Forfeited — $ — Vested (252,354) $ 9.56 Balance at December 31, 2019 757,061 Granted 589,248 $ 9.35 Forfeited (3,744) $ 9.35 Vested (1) (398,729) $ 9.48 Balance at December 31, 2020 943,836 (1) Total shares vested include 78,849 shares of common stock that were tendered by employees during the year ended December 31, 2020, to satisfy minimum statutory tax with holdings requirements associated with the vesting of RSUs. Issuance of Restricted Stock to Directors On June 15, 2020, the Company issued 8,055 shares of restricted stock to each of the Company’s independent directors upon his or her reelection to the Board. Half of the restricted shares vested upon issuance, and the remaining half are scheduled to vest upon the first anniversary of the grant date, subject to the independent director’s continued service as a director during such vesting period. Distributions Earnings and profits, which determine the taxability of distributions to stockholders, may differ from income reported for financial reporting purposes due to the differences for federal income tax purposes in the treatment of loss on debt, revenue recognition and compensation expense and in the basis of depreciable assets and estimated useful lives used to compute depreciation expense. The following unaudited table summarizes the federal income tax treatment for all distributions per share for the years ended December 31, 2020, 2019, and 2018 reported for federal tax purposes and serves as a designation of capital gain distributions, if applicable, pursuant to Code Section 857(b)(3)(C) and Treasury Regulation §1.857-6(e). Year Ended December 31, 2020 2019 2018 Ordinary income $ 0.13 33 % $ 0.22 37 % $ 0.32 47 % Capital gain — — % 0.08 13 % — — % Return of capital 0.27 67 % 0.30 50 % 0.36 53 % Total distributions paid $ 0.40 100 % $ 0.60 100 % $ 0.68 100 %

Noncontrolling Interests

Noncontrolling Interests	12 Months Ended
	Dec. 31, 2020
Noncontrolling Interest [Abstract]
Noncontrolling Interest	Noncontrolling Interests Noncontrolling interests represent limited partnership interests in the GCEAR Operating Partnership in which the Company is the general partner. General partnership units and limited partnership units of the GCEAR Operating Partnership were issued as part of the initial capitalization of the EA-1 Operating Partnership and GCEAR II Operating Partnership, in conjunction with members of management's contribution of certain assets, other contributions, and in connection with the Self-Administration Transaction as discussed in Note 1, Organization. As of December 31, 2020, noncontrolling interests were approximately 12.2% of total shares and 12.0% of weighted average shares outstanding (both measures assuming GCEAR OP Units were converted to common stock). The Company has evaluated the terms of the limited partnership interests in the GCEAR Operating Partnership, and as a result, has classified limited partnership interests issued in the initial capitalization, in conjunction with the contributed assets and in connection with the Self-Administration Transaction, as noncontrolling interests, which are presented as a component of permanent equity, except as discussed below. The Company evaluates individual noncontrolling interests for the ability to recognize the noncontrolling interest as permanent equity on the consolidated balance sheets at the time such interests are issued and on a continual basis. Any noncontrolling interest that fails to qualify as permanent equity has been reclassified as temporary equity and adjusted to the greater of (a) the carrying amount or (b) its redemption value as of the end of the period in which the determination is made. As of December 31, 2020, the limited partners of the GCEAR Operating Partnership owned approximately $31.8 million GCEAR OP Units, which were issued to affiliated parties and unaffiliated third parties in exchange for certain properties, and in connection with the Self-Administration Transaction and other services. Approximatel y 20.4 million GCEAR O P Units issued to affiliates had a mandatory hold period until December 2020 and had no voting rights until the units convert to common shares. In addition, 0.2 million GCEAR OP Units were issued to unaffiliated third parties unrelated to property contributions. To the extent the contributors should elect to redeem all or a portion of their GCEAR OP Units, pursuant to the terms of the respective contribution agreement, such redemption shall be at a per unit value equivalent to the price at which the contributor acquired its GCEAR OP Units in the respective transaction. The limited partners of the GCEAR Operating Partnership, other than those related to the Will Partners REIT, LLC ("Will Partners") property contribution, will have the right to cause the general partner of the GCEAR Operating Partnership, the Company, to redeem their GCEAR OP Units for cash equal to the value of an equivalent number of shares, or, at the Company’s option, purchase their GCEAR OP Units by issuing one share of the Company’s common stock for the original redemption value of each limited partnership unit redeemed. The Company has the control and ability to settle such requests in shares. These rights may not be exercised under certain circumstances which could cause the Company to lose its REIT election. There were 134,383 GCEAR OP Units redeemed during the year ended December 31, 2020 and 6,000 units redeemed during the year ended December 31, 2019. The following summarizes the activity for noncontrolling interests recorded as equity for the years ended December 31, 2020 and 2019: December 31, 2020 2019 Beginning balance $ 245,040 $ 232,203 Contributions/issuance of noncontrolling interests — 30,039 Reclass of noncontrolling interest subject to redemption 224 — Repurchase of noncontrolling interest (1,137) — Issuance of stock dividend for noncontrolling interest 1,068 1,861 Distributions to noncontrolling interests (13,306) (19,716) Allocated distributions to noncontrolling interests subject to redemption (29) (42) Net (loss) income (1,732) 3,749 Other comprehensive loss (3,578) (3,054) Ending balance $ 226,550 $ 245,040 Noncontrolling interests subject to redemption Operating partnership units issued pursuant to the Will Partners property contribution are not included in permanent equity on the consolidated balance sheets. The partners holding these units can cause the general partner to redeem the units for the cash value, as defined in the GCEAR Operating Partnership agreement. As the general partner does not control these redemptions, these units are presented on the consolidated balance sheets as noncontrolling interest subject to redemption at their redeemable value. The net income (loss) and distributions attributed to these limited partners is allocated proportionately between common stockholders and other noncontrolling interests that are not considered redeemable.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2020
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transactions	Related Party Transactions Summarized below are the related-party costs incurred by the Company for the years ended December 31, 2020, 2019 and 2018, respectively, and any related amounts receivable and payable as of December 31, 2020 and 2019: Incurred for the Year Ended December 31, Receivable as of December 31, 2020 2019 2018 2020 2019 Assets Assumed through the Self-Administration Transaction Cash to be received from an affiliate related to deferred compensation and other payroll costs $ — $ 658 $ — $ — $ — Other fees 243 — — 293 352 Due from GCC Reimbursable Expense Allocation 15 4 — 4 4 Payroll/Expense Allocation 653 481 — 1,114 481 Due from Affiliates Payroll/Expense Allocation — 1,217 — — — O&O Costs (including payroll allocated to O&O) — 157 — — — Other Fees — 6,375 — — — Total incurred/receivable $ 911 $ 8,892 $ — $ 1,411 $ 837 Incurred for the Year Ended December 31, Payable as of December 31, 2020 2019 2018 2020 2019 Expensed Operating expenses $ — $ — $ 3,594 $ — $ — Asset management fees — — 23,668 — — Property management fees — — 9,479 — — Disposition fees — 641 177 — — Costs advanced by the advisor 2,000 3,771 546 1,085 1,164 Consulting fee - shared services 2,500 2,500 — 695 441 Capitalized Acquisition fees — 942 5,331 — — Leasing commissions — 2,540 2,289 — — Assumed through Self- Administration Transaction/EA Mergers Earn-out — — — 262 2,919 Other Fees — 20 — — — Stockholder Servicing Fee — 692 — 494 4,994 Other Distributions 10,537 14,138 — 736 1,365 Total incurred/payable $ 15,037 $ 25,244 $ 45,084 $ 3,272 $ 10,883 Dealer Manager Agreement GCEAR entered into a dealer manager agreement and associated form of participating dealer agreement (the "Dealer Manager Agreement") with the dealer manager for the Follow-On Offering. The terms of the Dealer Manager Agreement are substantially similar to the terms of the dealer manager agreement from GCEAR's initial public offering ("IPO"), except as it relates to the share classes offered and the fees to be received by the dealer manager. The Follow-On Offering terminated on September 20, 2020. See Note 9, Equity. Subject to the Financial Industry Regulatory Authority, Inc.'s limitations on underwriting compensation, under the Dealer Manager Agreement the Company requires payment to the dealer manager of a distribution fee for ongoing services rendered to stockholders by participating broker-dealers or broker-dealers servicing investors’ accounts, referred to as servicing broker-dealers. The fee accrues daily, is paid monthly in arrears, and is calculated based on the average daily NAV for the applicable month (the “Average NAV”). Conflicts of Interest Affiliated Dealer Manager Since Griffin Capital Securities, LLC, the Company's dealer manager, is an affiliate of the Company's former sponsor, the Company does not have the benefit of an independent due diligence review and investigation of the type normally performed by an unaffiliated, independent underwriter in connection with the offering of securities. The Company's dealer manager is also serving as the dealer manager for Griffin-American Healthcare REIT III, Inc. and Griffin-American Healthcare REIT IV, Inc., each of which are publicly-registered, non-traded REITs, as wholesale marketing agent for Griffin Institutional Access Real Estate Fund and Griffin Institutional Access Credit Fund both of which are non-diversified, closed-end management investment companies that are operated as interval funds under the 1940 Act, and as dealer manager or master placement agent for various private offerings. Administrative Services Agreement In connection with the EA Merger, the Company assumed, as the successor of EA-1 and the EA-1 Operating Partnership, an Administrative Services Agreement (the "Administrative Services Agreement"), pursuant to which GCC and GC LLC continue to provide office space and certain operational and administrative services at cost to the GCEAR Operating Partnership, Griffin Capital Essential Asset TRS, Inc., and GRECO, which may include, without limitation, the shared information technology, human resources, legal, due diligence, marketing, customer service, events, operations, accounting and administrative support services set forth in the Administrative Services Agreement. The Company pays GCC a monthly amount based on the actual costs anticipated to be incurred by GCC for the provision of such office space and services until the Company elects to provide such space and/or services for itself or through another provider, which amount is initially $0.2 million per month, based on an approved budget. Such costs are reconciled quarterly and a full review of the costs will be performed at least annually. In addition, the Company will directly pay or reimburse GCC for the actual cost of any reasonable third-party expenses incurred in connection with the provision of such services. Certain Conflict Resolution Procedures Every transaction that the Company enters into with affiliates is subject to an inherent conflict of interest. The Board may encounter conflicts of interest in enforcing the Company's rights against any affiliate in the event of a default by or disagreement with an affiliate or in invoking powers, rights or options pursuant to any agreement between the Company and affiliates. See the Company's Code of Ethics available at the "Corporate Governance" subpage of the Company's website at www.GCEAR.com for a detailed description of the Company's conflict resolution procedures.

Operating Leases

Operating Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Operating Leases	Operating Leases Lessor The Company leases commercial and industrial space to tenants primarily under non-cancelable operating leases that generally contain provisions for minimum base rents plus reimbursement for certain operating expenses. Total minimum lease payments are recognized in rental income on a straight-line basis over the term of the related lease and estimated reimbursements from tenants for real estate taxes, insurance, common area maintenance and other recoverable operating expenses are recognized in rental income in the period that the expenses are incurred. The Company recognized $314.1 million, $291.4 million and $247.4 million of lease income related to operating lease payments for the year ended December 31, 2020, 2019 and 2018, respectively. The Company's current leases have expirations ranging from 2021 to 2044. The following table sets forth the undiscounted cash flows for future minimum base rents to be received under operating leases as of December 31, 2020. As of December 31, 2020 2021 $ 300,861 2022 302,912 2023 289,261 2024 249,419 2025 208,153 Thereafter 937,408 Total $ 2,288,014 The future minimum base rents in the table above excludes tenant reimbursements of operating expenses, amortization of adjustments for deferred rent receivables and the amortization of above/below-market lease intangibles. Lessee As of December 31, 2020, the Company leased three parcels of land located in Arizona under long-term ground leases with expiration dates of September 2102, December 2095, and September 2102 with no options to renew. The Company leases office space as part of conducting day-to-day business in Chicago. The Company's office space lease has a remaining lease term of approximately five years and no option to renew. The Company incurred operating lease costs of approximately $3.7 million and $2.8 million for the year ended December 31, 2020 and 2019 respectively, which are included in "Property Operating Expense" in the accompanying consolidated statement of operations. Total cash paid for amounts included in the measurement of operating lease liabilities was $1.6 million and $1.2 million for the years ended December 31, 2020 and 2019, respectively. The following table sets forth the weighted-average for the lease term and the discount rate as of December 31, 2020 and 2019: As of Lease Term and Discount Rate December 31, 2020 December 31, 2019 Weighted-average remaining lease term in years. 80.1 80.9 Weighted-average discount rate (1) 4.98 % 4.98 % (1) Because the rate implicit in each of the Company's leases was not readily determinable, the Company used an incremental borrowing rate. In determining the Company's incremental borrowing rate for each lease, the Company considered recent rates on secured borrowings, observable risk-free interest rates and credit spreads correlating to the Company's creditworthiness, the impact of collateralization and the term of each of the Company's lease agreements. Maturities of lease liabilities as of December 31, 2020 were as follows: December 31, 2020 2021 $ 1,632 2022 1,675 2023 1,741 2024 1,776 2025 1,727 Thereafter 285,011 Total undiscounted lease payments 293,562 Less imputed interest (247,916) Total lease liabilities $ 45,646

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation From time to time, the Company may become subject to legal proceedings, claims and litigation arising in the ordinary course of business. The Company is not a party to any material legal proceedings, nor is the Company aware of any pending or threatened litigation that would have a material adverse effect on the Company’s business, operating results, cash flows or financial condition should such litigation be resolved unfavorably.

Declaration of Distributions

Declaration of Distributions	12 Months Ended
	Dec. 31, 2020
Declaration of Distributions [Abstract]
Declaration of Distributions	Declaration of DistributionsOn March 30, 2020, the Board elected to change from a quarterly to a monthly declaration of distributions commencing in April 2020 in order to give the Board maximum flexibility due to the review of a prior potential strategic transaction and to monitor and evaluate the situation related to the financial impact of COVID-19 pandemic.  As noted elsewhere, the Company is continuing to closely monitor the impact of the COVID-19 pandemic and believes it is prudent to continue to employ a more conservative cash management strategy due to the current environment. In light of these considerations, on September 29, 2020, October 19, 2020, and November 30, 2020, the Board declared cash distributions in the amount of $0.000956284 per day ($0.35 per share annualized), subject to adjustments for class-specific expenses, per Class E share, Class T share, Class S share, Class D share, Class I share, Class A share, Class AA share and Class AAA share of common stock, for stockholders of such classes as of the close of each business day of the period from October 1, 2020 through October 31, 2020, November 1, 2020 through November 30, 2020 and December 1, 2020 through December 31, 2020, respectively. The Company paid such distributions to each stockholder of record on November 2, 2020, December 1, 2020 and January 4, 2021 respectively.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events DRP Offering As of February 24, 2021, the Company had issued 33,532,756 shares of the Company’s common stock pursuant to the DRP offerings for approximately $323.1 million (includes historical amounts sold by EA-1 prior to the EA Merger). Cash Distributions On December 17, 2020, January 26, 2021 and February 25, 2021, the Board declared cash distributions in the amount of $0.000958904 per day ($0.35 per share annualized), subject to adjustments for class-specific expenses, per Class E share, Class T share, Class S share, Class D share, Class I share, Class A share, Class AA share and Class AAA share of common stock, for stockholders of such classes as of the close of each business day of the period from January 1, 2021 through January 31, 2021, February 1, 2021 through February 28, 2021, and March 1, 2021 through March 31, 2021, respectively. The Company paid such January distributions to each stockholder of record on February 25, 2021, and intends to pay such February and March distributions to each stockholder of record at such time in March 2021 and April 2021, respectively, as determined by the Company’s Chief Executive Officer. Issuance of Restricted Stock Units to Executive Officers and Employees On January 22, 2021, the Company issued 1,071,347 Restricted Stock Unit Awards to Company employees, including officers, under the LTIP. Each RSU represents a contingent right to receive one share of the Company’s Class E common stock when settled in accordance with the terms of the respective Restricted Stock Unit Award Agreement and 1/3 of the RSUs are scheduled to vest equally on each of December 31, 2021, 2022, and 2023 provided that the employee continues to be employed by the Company on each such date, subject to certain accelerated vesting provisions as provided in the respective Restricted Stock Award Agreement. The fair value of grants issued was approximately $9.6 million.

Schedule III Real Estate Assets

Schedule III Real Estate Assets and Accumulated Depreciation and Amortization	12 Months Ended
	Dec. 31, 2020
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III Real Estate Assets and Accumulated Depreciation and Amortization	GRIFFIN CAPITAL ESSENTIAL ASSET REIT, INC. SCHEDULE III REAL ESTATE ASSETS AND ACCUMULATED DEPRECIATION AND AMORTIZATION (Dollars in thousands) Initial Cost to Company (1) Total Adjustment to Basis (2) Gross Carrying Amount at Life on Property Property Type State Encumbrances (3) Land Building and Improvements Building and Improvements Land Building and Improvements (2) Total Accumulated Depreciation and Amortization Date of Construction Date of Acquisition Plainfield Office IL $ — $ 3,709 $ 22,209 $ 7,344 $ 3,709 $ 29,552 $ 33,261 $ 15,568 N/A 6/18/2009 5-40 years Renfro Industrial SC 12,548 1,400 18,182 2,012 1,400 20,194 21,594 9,595 N/A 6/18/2009 5-40 years Emporia Partners Industrial KS 1,627 274 7,567 962 274 8,530 8,804 3,216 N/A 8/27/2010 5-40 years AT&T Office WA 24,167 6,770 32,420 718 6,770 33,138 39,908 11,085 N/A 1/31/2012 5-40 years Westinghouse Office PA 20,449 2,650 26,745 54 2,650 26,799 29,449 9,550 N/A 3/22/2012 5-40 years TransDigm Industrial NJ 4,276 3,773 9,030 411 3,773 9,441 13,214 3,056 N/A 5/31/2012 5-40 years Atrium II Office CO 8,830 2,600 13,500 10,267 2,600 23,767 26,367 6,864 N/A 6/29/2012 5-40 years Zeller Plastik Industrial IL 8,365 2,674 13,229 651 2,674 13,881 16,555 4,239 N/A 11/8/2012 5-40 years Northrop Grumman Office OH 10,139 1,300 16,188 39 1,300 16,227 17,527 6,887 N/A 11/13/2012 5-40 years Health Net Office CA 12,548 4,182 18,072 324 4,182 18,396 22,578 8,851 N/A 12/18/2012 5-40 years Comcast Office CO 14,105 (5) 3,146 22,826 1,788 3,146 24,614 27,760 11,021 N/A 1/11/2013 5-40 years 500 Rivertech Office WA — 3,000 9,000 6,784 3,000 15,784 18,784 5,535 N/A 2/15/2013 5-40 years Schlumberger Office TX 28,221 2,800 47,752 1,285 2,800 49,037 51,837 13,537 N/A 5/1/2013 5-40 years UTC Office NC 22,306 1,330 37,858 — 1,330 37,858 39,188 11,482 N/A 5/3/2013 5-40 years Avnet Industrial AZ 18,644 1,860 31,481 47 1,860 31,528 33,388 8,068 N/A 5/29/2013 5-40 years Cigna Office AZ 39,000 (5) 8,600 48,102 133 8,600 48,235 56,835 14,678 N/A 6/20/2013 5-40 years Amazon - Arlington Heights Industrial IL — 7,697 21,843 5,879 7,697 27,722 35,419 7,194 N/A 8/13/2013 5-40 years Verizon Office NJ 24,559 5,300 36,768 14,032 5,300 50,800 56,100 17,817 N/A 10/3/2013 5-40 years Fox Head Office CA — 3,672 23,230 — 3,672 23,230 26,902 5,916 N/A 10/29/2013 5-40 years 2500 Windy Ridge Office GA — 5,000 50,227 17,864 5,000 68,091 73,091 17,417 N/A 11/5/2013 5-40 years General Electric Office GA — 5,050 51,396 132 5,050 51,529 56,579 12,746 N/A 11/5/2013 5-40 years Atlanta Wildwood Office GA — 4,241 23,414 6,114 4,241 29,528 33,769 10,079 N/A 11/5/2013 5-40 years Community Insurance Office OH — 1,177 22,323 3,725 1,177 26,047 27,224 6,016 N/A 11/5/2013 5-40 years Anthem Office OH — 850 8,892 175 850 9,067 9,917 3,016 N/A 11/5/2013 5-40 years JPMorgan Chase Office OH — 5,500 39,000 978 5,500 39,978 45,478 11,296 N/A 11/5/2013 5-40 years Initial Cost to Company (1) Total Adjustment to Basis (2) Gross Carrying Amount at Life on Property Property Type State Encumbrances (3) Land Building and Improvements Building and Improvements Land Building and Improvements (2) Total Accumulated Depreciation and Amortization Date of Construction Date of Acquisition Sterling Commerce Center Office OH — 4,750 32,769 5,400 4,750 38,170 42,920 13,049 N/A 11/5/2013 5-40 years Aetna (Arlington) Office TX 36,199 (5) 3,000 12,330 663 3,000 12,994 15,994 4,843 N/A 11/5/2013 5-40 years CHRISTUS Health Office TX — 1,950 46,922 377 1,950 47,299 49,249 15,805 N/A 11/5/2013 5-40 years Roush Industries Office MI — 875 11,375 2,492 875 13,867 14,742 3,937 N/A 11/5/2013 5-40 years Parkland Center Office WI — 3,100 26,348 11,040 3,100 37,387 40,487 17,841 N/A 11/5/2013 5-40 years 1200 Morris Office PA — 2,925 18,935 2,708 2,925 21,643 24,568 8,235 N/A 11/5/2013 5-40 years United HealthCare Office MO — 2,920 23,510 8,969 2,920 32,478 35,398 8,865 N/A 11/5/2013 5-40 years Intermec (Northpointe Corporate Center II) Office WA — 1,109 6,066 4,576 1,109 10,642 11,751 3,831 N/A 11/5/2013 5-40 years Comcast (Northpointe Corporate Center I) Office WA 39,650 (5) 2,292 16,930 2,324 2,292 19,254 21,546 5,486 N/A 11/5/2013 5-40 years Farmers Office KS — 2,750 17,106 816 2,750 17,923 20,673 6,400 N/A 12/27/2013 5-40 years 2200 Channahon Road Industrial IL — 6,000 46,511 (24,957) 2,066 25,488 27,554 14,718 N/A 5-40 years Digital Globe Office CO — 8,600 83,400 — 8,600 83,400 92,000 22,299 N/A 1/14/2014 5-40 years Waste Management Office AZ — — 16,515 82 — 16,597 16,597 5,390 N/A 1/16/2014 5-40 years Wyndham Worldwide Office NJ — 6,200 91,153 2,494 6,200 93,647 99,847 19,388 N/A 4/23/2014 5-40 years ACE Hardware Corporation HQ Office IL 22,750 (5) 6,900 33,945 — 6,900 33,945 40,845 8,693 N/A 4/24/2014 5-40 years Equifax Office MO — 1,850 12,709 578 1,850 13,287 15,137 4,624 N/A 5/20/2014 5-40 years American Express Office AZ — 15,000 45,893 5,408 15,000 51,300 66,300 19,104 N/A 5/22/2014 5-40 years Circle Star Office CA — 22,789 68,950 4,704 22,789 73,654 96,443 24,810 N/A 5/28/2014 5-40 years Vanguard Office NC — 2,230 31,062 819 2,230 31,881 34,111 8,614 N/A 6/19/2014 5-40 years Parallon Office FL 6,971 1,000 16,772 — 1,000 16,772 17,772 4,519 N/A 6/25/2014 5-40 years TW Telecom Office CO — 10,554 35,817 1,474 10,554 37,292 47,846 10,947 N/A 8/1/2014 5-40 years Equifax II Office MO — 2,200 12,755 266 2,200 13,022 15,222 3,920 N/A 10/1/2014 5-40 years Mason I Office OH — 4,777 18,489 746 4,777 19,235 24,012 2,928 N/A 11/7/2014 5-40 years Wells Fargo (Charlotte) Office NC 26,975 (5) 2,150 40,806 46 2,150 40,852 43,002 9,743 N/A 12/15/2014 5-40 years GE Aviation Office OH — 4,400 61,681 — 4,400 61,681 66,081 15,656 N/A 2/19/2015 5-40 years Westgate III Office TX — 3,209 75,937 — 3,209 75,937 79,146 16,145 N/A 4/1/2015 5-40 years 2275 Cabot Drive Office IL — 2,788 16,200 (10,796) 373 7,818 8,191 6,504 N/A 6/10/2015 5-40 years Franklin Center Office MD — 6,989 46,875 1,436 6,989 48,311 55,300 9,780 N/A 6/10/2015 5-40 years 4650 Lakehurst Court Office OH — 2,943 22,651 808 2,943 23,459 26,402 8,308 N/A 6/10/2015 5-40 years Initial Cost to Company (1) Total Adjustment to Basis (2) Gross Carrying Amount at Life on Property Property Type State Encumbrances (3) Land Building and Improvements Building and Improvements Land Building and Improvements (2) Total Accumulated Depreciation and Amortization Date of Construction Date of Acquisition Miramar Office FL — 4,488 19,979 2,233 4,488 22,212 26,700 5,145 N/A 6/10/2015 5-40 years Royal Ridge V Office TX 21,385 (5) 1,842 22,052 3,667 1,842 25,719 27,561 5,507 N/A 6/10/2015 5-40 years Duke Bridges Office TX 27,475 (5) 8,239 51,395 7,867 8,239 59,263 67,502 11,167 N/A 6/10/2015 5-40 years Houston Westway II Office TX — 3,961 78,668 1,461 3,961 80,129 84,090 19,740 N/A 6/10/2015 5-40 years Houston Westway I Office TX — 6,540 30,703 (2,647) 2,668 16,175 18,843 6,425 N/A 6/10/2015 5-40 years Atlanta Perimeter Office GA 69,461 (5) 8,382 96,718 957 8,382 97,675 106,057 31,017 N/A 5-40 years South Lake at Dulles Office VA — 9,666 74,098 26,501 9,666 100,599 110,265 18,592 N/A 6/10/2015 5-40 years Four Parkway Office IL — 4,339 37,298 4,228 4,339 41,526 45,865 11,510 N/A 6/10/2015 5-40 years Highway 94 Industrial MO 14,689 5,637 25,280 — 5,637 25,280 30,917 6,306 N/A 11/6/2015 5-40 years Heritage III Office TX — 1,955 15,540 5,436 1,955 20,976 22,931 3,788 N/A 12/11/2015 5-40 years Heritage IV Office TX — 2,330 26,376 4,744 2,330 31,120 33,450 6,209 N/A 12/11/2015 5-40 years Samsonite Industrial FL 20,165 5,040 42,490 11 5,040 42,501 47,541 7,711 N/A 12/11/2015 5-40 years Restoration Hardware Industrial CA 78,000 (5) 15,463 36,613 37,693 15,463 74,305 89,768 18,432 N/A 1/14/2016 5-40 years HealthSpring Office TN 20,208 8,126 31,447 43 8,126 31,490 39,616 6,971 N/A 4/27/2016 5-40 years LPL Office SC — 4,612 86,352 — 4,612 86,352 90,964 7,821 N/A 11/30/2017 5-40 years LPL Office SC — 1,274 41,509 — 1,273 41,509 42,782 3,760 N/A 11/30/2017 5-40 years Quaker Industrial FL — 5,433 55,341 — 5,433 55,341 60,774 4,760 N/A 3/13/2018 5-40 years McKesson Office AZ — 312 69,760 — 312 69,760 70,072 9,879 N/A 4/10/2018 5-40 years Shaw Industries Industrial GA — 5,465 57,116 — 5,465 57,116 62,581 4,737 N/A 5/3/2018 5-40 years GEAR Entities Land WA — 1,584 — — 1,584 — 1,584 — N/A 3/17/2016 N/A Owens Corning Industrial NC 3,295 867 4,418 901 867 5,319 6,186 500 N/A 5/1/2019 5-40 years Westgate II Office TX 34,152 7,716 48,422 870 7,716 49,292 57,008 5,047 N/A 5/1/2019 5-40 years Administrative Office of Pennsylvania Courts Office PA 6,061 1,246 9,626 498 1,246 10,125 11,371 972 N/A 5/1/2019 5-40 years American Express Center Office AZ 54,823 10,595 82,098 3,109 10,595 85,207 95,802 9,882 - 5/1/2019 5-40 years MGM Corporate Center Office NV 18,154 4,546 25,825 1,223 4,546 27,049 31,595 2,823 - 5/1/2019 5-40 years American Showa Industrial OH 10,306 1,214 16,538 2,427 1,214 18,965 20,179 1,588 N/A 5/1/2019 5-40 years Huntington Ingalls Industrial VA — 6,213 29,219 2,670 6,213 31,889 38,102 2,712 - 5/1/2019 5-40 years Wyndham Office NJ — 9,677 71,316 1,742 9,677 73,058 82,735 5,678 N/A 5/1/2019 5-40 years Exel Industrial OH — 978 14,137 2,568 978 16,705 17,683 1,941 N/A 5/1/2019 5-40 years Initial Cost to Company (1) Total Adjustment to Basis (2) Gross Carrying Amount at Life on Property Property Type State Encumbrances (3) Land Building and Improvements Building and Improvements Land Building and Improvements (2) Total Accumulated Depreciation and Amortization Date of Construction Date of Acquisition Rapiscan Systems Office MA — 2,006 10,270 484 2,006 10,755 12,761 1,013 N/A 5/1/2019 5-40 years Aetna Office AZ — 2,332 18,486 1,598 2,332 20,084 22,416 2,003 N/A 5/1/2019 5-40 years Atlas Copco Office MI — 1,156 18,297 1,505 1,156 19,802 20,958 1,729 N/A 5/1/2019 5-40 years Toshiba TEC Office NC — 1,916 36,374 2,423 1,916 38,796 40,712 3,246 N/A 5/1/2019 5-40 years NETGEAR Office CA — 22,600 28,859 1,700 22,600 30,559 53,159 3,799 N/A 5/1/2019 5-40 years Nike Office OR — 8,186 41,184 2,164 8,187 43,347 51,534 5,512 - 5/1/2019 5-40 years Zebra Technologies Office IL — 5,927 58,688 1,255 5,927 59,943 65,870 6,168 N/A 5/1/2019 5-40 years WABCO Industrial SC — 1,226 13,902 839 1,226 14,741 15,967 860 N/A 5/1/2019 5-40 years IGT Office NV 45,300 (7) 5,673 67,610 2,021 5,673 69,631 75,304 4,501 - 5/1/2019 5-40 years 3M Industrial IL 43,600 (7) 5,802 75,758 6,391 5,802 82,148 87,950 4,388 N/A 5/1/2019 5-40 years Amazon - Etna Industrial OH 61,500 (7) 4,773 95,475 11,546 4,773 107,021 111,794 6,799 N/A 5/1/2019 5-40 years Zoetis Office NJ — 3,718 44,082 735 3,718 44,817 48,535 3,268 N/A 5/1/2019 5-40 years Southern Company Office AL 99,600 (7) 7,794 157,724 1,457 7,794 159,181 166,975 7,615 N/A 5/1/2019 38 years Allstate Office CO — 3,109 13,096 553 3,109 13,649 16,758 1,214 N/A 5/1/2019 5-40 years MISO Office IN — 3,725 25,848 971 3,725 26,820 30,545 2,074 N/A 5/1/2019 5-40 years McKesson II Office AZ — — 36,959 4,681 — 41,640 41,640 2,794 N/A 9/20/2019 5-40 years Pepsi Bottling Ventures Industrial NC 18,590 3,407 31,783 954 3,407 32,734 36,141 1,033 N/A 2/5/2020 5-40 years Others (6) — — 95 — 95 95 26 Total all properties (4) $ 1,029,093 $ 455,895 $ 3,616,395 $ 253,765 $ 445,674 $ 3,864,628 $ 4,310,302 $ 817,773 (1) Building and improvements include tenant origination and absorption costs. (2) Consists of capital expenditure, real estate development costs, and impairment charges. (3) Amount does not include the net loan valuation discount of $0.6 million related to the debt assumed in the Highway 94, Samsonite and HealthSpring property acquisitions, as well as Owens Corning, Westgate II, AOPC, IPC/TRWC (AMEX), MGM, American Showa, BAML and Pepsi Bottling Ventures. (4) As of December 31, 2020, the aggregate cost of real estate the Company and consolidated subsidiaries owned for federal income tax purposes was approximately $4.1 billion (unaudited). (5) The BOA Loan is secured by cross-collateralized and cross-defaulted first mortgage liens on the properties. (6) Represents furniture & fixtures for the Company's office in Chicago. (7) The BOA/KeyBank Loan is secured by cross-collateralized and cross-defaulted first mortgage liens on the properties. Activity for the Year Ended December 31, 2020 2019 2018 Real estate facilities Balance at beginning of year $ 4,278,433 $ 3,073,364 $ 2,869,328 Acquisitions 36,144 1,305,998 193,430 Construction costs and improvements 72,306 51,440 26,883 Impairment provision (23,472) (30,734) — Sale of real estate assets (53,109) (121,635) (16,277) Balance at end of year $ 4,310,302 $ 4,278,433 $ 3,073,364 Accumulated depreciation Balance at beginning of year $ 668,104 $ 538,412 $ 426,752 Depreciation and amortization expense 161,056 153,425 119,168 Less: Non-real estate assets depreciation expense (4,619) (7,769) (3,584) Less: Sale of real estate assets depreciation expense (6,768) (15,964) (3,924) Balance at end of year $ 817,773 $ 668,104 $ 538,412 Real estate facilities, net $ 3,492,529 $ 3,610,329 $ 2,534,952

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Principles of Consolidation and Consolidation Considerations	Principles of Consolidation The Company's financial statements, and the financial statements of the GCEAR Operating Partnership, including its wholly-owned subsidiaries, are consolidated in the accompanying consolidated financial statements. The portion of these entities not wholly-owned by the Company is presented as noncontrolling interests. All significant intercompany accounts and transactions have been eliminated in consolidation. Consolidation Considerations Current accounting guidance provides a framework for identifying a variable interest entity (“VIE”) and determining when a company should include the assets, liabilities, noncontrolling interests, and results of activities of a VIE in its consolidated financial statements. In general, a VIE is an entity or other legal structure used to conduct activities or hold assets that either (1) has an insufficient amount of equity to carry out its principal activities without additional subordinated financial support, (2) has a group of equity owners that are unable to make significant decisions about its activities, or (3) has a group of equity owners that do not have the obligation to absorb losses or the right to receive returns generated by its operations. Generally, a VIE should be consolidated if a party with an ownership, contractual, or other financial interest in the VIE (a variable interest holder) has the power to direct the VIE’s most significant activities and the obligation to absorb losses or right to receive benefits of the VIE that could be significant to the VIE. A variable interest holder that consolidates the VIE is called the primary beneficiary. Upon consolidation, the primary beneficiary generally must initially record all of the VIE’s assets, liabilities, and noncontrolling interests at fair value and subsequently account for the VIE as if it were consolidated based on majority voting interest. See Note 4, Investments in Unconsolidated Entities, for more detail .
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all short-term, highly liquid investments that are readily convertible to cash with a maturity of three months or less at the time of purchase to be cash equivalents. Cash and cash equivalents may include cash and short-term investments. Short-term investments are stated at cost, which approximates fair value. There were no cash equivalents, nor were there restrictions on the use of the Company’s cash balance as of December 31, 2020 and 2019. The Company maintains its cash accounts with major financial institutions. The cash balances consist of business checking accounts. These accounts are insured by the Federal Deposit Insurance Corporation up to $250,000 at each institution. The Company has not experienced any losses with respect to cash balances in excess of government provided insurance. Management believes there was no significant concentration of credit risk with respect to these cash balances as of December 31, 2020.
Restricted Cash	Restricted Cash In conjunction with acquisitions of certain assets, as required by certain lease provisions or certain lenders in conjunction with an acquisition or debt financing, or credits received by the seller of certain assets, the Company assumed or funded reserves for specific property improvements and deferred maintenance, re-leasing costs, and taxes and insurance, which are included on the consolidated balance sheets as restricted cash.
Real Estate Purchase Price Allocation	Real Estate Purchase Price Allocation The Company applies the provisions in ASC 805-10, Business Combinations ( " ASC 805-10"), to account for the acquisition of real estate, or real estate related assets, in which a lease, or other contract, is in place representing an active revenue stream, as an asset acquisition (in rare cases, a business combination). In accordance with the provisions of ASC 805-10 (on an asset acquisition), the Company recognizes the assets acquired, the liabilities assumed and any noncontrolling interest in the acquired entity at their relative fair values. The accounting provisions have also established that transaction costs associated with an asset acquisition are capitalized. Acquired in-place leases are valued as above-market or below-market as of the date of acquisition. The valuation is measured based on the present value (using an interest rate, which reflects the risks associated with the leases acquired) of the difference between (a) the contractual amounts to be paid pursuant to the in-place leases and (b) management’s estimate of fair market lease rates for the corresponding in-place leases over a period equal to the remaining non-cancelable term of the lease for above-market leases, taking into consideration below-market extension options for below-market leases. In addition, renewal options are considered and will be included in the valuation of in-place leases if (1) it is likely that the tenant will exercise the option, and (2) the renewal rent is considered to be sufficiently below a fair market rental rate at the time of renewal. The above-market and below-market lease values are capitalized as intangible lease assets or liabilities and amortized as an adjustment to rental income over the remaining terms of the respective leases. The aggregate relative fair value of in-place leases includes direct costs associated with obtaining a new tenant, opportunity costs associated with lost rentals, which are avoided by acquiring an in-place lease, and tenant relationships. Direct costs associated with obtaining a new tenant include commissions, tenant improvements, and other direct costs, and are estimated using methods similar to those used in independent appraisals and management’s consideration of current market costs to execute a similar lease. These direct costs are considered intangible lease assets and are included with real estate assets on the consolidated balance sheets. The intangible lease assets are amortized to expense over the remaining terms of the respective leases. The value of opportunity costs is calculated using the contractual amounts to be paid, including real estate taxes, insurance, and other operating expenses, pursuant to the in-place leases over a market lease-up period for a similar lease. Customer relationships are valued based on management’s evaluation of certain characteristics of each tenant’s lease and the Company’s overall relationship with that respective tenant. Characteristics management will consider in allocating these values include the nature and extent of the Company’s existing business relationships with tenants, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals (including those existing under the terms of the lease agreement), among other factors. These intangibles will be included in intangible lease assets on the consolidated balance sheets and are amortized to expense over the remaining term of the respective leases.
Depreciation and Amortization	Depreciation and Amortization The purchase price of real estate acquired and costs related to development, construction, and property improvements are capitalized. Repairs and maintenance costs include all costs that do not extend the useful life of the real estate asset and are expensed as incurred. The Company considers the period of future benefit of an asset to determine the appropriate useful life. The Company anticipates the estimated useful lives of its assets by class to be generally as follows: Buildings 25-40 years Building Improvements 5-20 years Land Improvements 15-25 years Tenant Improvements Shorter of estimated useful life or remaining contractual lease term Tenant Origination and Absorption Cost Remaining contractual lease term In-place Lease Valuation Remaining contractual lease term with consideration as to below-market extension options for below-market leases
Impairment of Real Estate and Related Intangible Assets	Impairment of Real Estate and Related Intangible Assets In accordance with the provisions of the Impairment or Disposal of Long-Lived Assets Subsections of ASC 360, the Company assesses the carrying values of our respective long-lived assets, whenever events or changes in circumstances indicate that the carrying amounts of these assets may not be fully recoverable. Recoverability of real estate assets is measured by comparison of the carrying amount of the asset to the estimated future undiscounted cash flows. To review real estate assets for recoverability, the Company considers current market conditions as well as the Company's intent with respect to holding or disposing of the asset. The intent with regard to the underlying assets might change as market conditions and other factors change. Fair value is determined through various valuation techniques, including discounted cash flow models, applying a capitalization rate to estimated net operating income of a property, quoted market values and third party appraisals, where considered necessary. The use of projected future cash flows is based on assumptions that are consistent with estimates of future expectations and the strategic plan used to manage the Company's underlying business. If the Company analysis indicates that the carrying value of the real estate asset is not recoverable on an
Revenue Recognition	Revenue Recognition Leases associated with the acquisition and contribution of certain real estate assets have net minimum rent payment increases during the term of the lease and are recorded to rental revenue on a straight-line basis, commencing as of the contribution or acquisition date. If a lease provides for contingent rental income, the Company will defer the recognition of contingent rental income, such as percentage rents, until the specific target that triggers the contingent rental income is achieved. Tenant reimbursement revenue, which is comprised of additional amounts collected from tenants for the recovery of certain operating expenses, including repair and maintenance, property taxes (excluding taxes paid by a lessee directly to a third party on behalf of the lessor) and insurance, and capital expenditures, to the extent allowed pursuant to the lease (collectively, "Recoverable Expenses"), is recognized as revenue when the additional rent is due. Recoverable Expenses to be reimbursed by a tenant are determined based on the Company's estimate of the property's operating expenses for the year, pro-rated based on leased square footage of the property, and are collected in equal installments as additional rent from the tenant, pursuant to the terms of the lease. At the end of each quarter, the Company reconciles the amount of additional rent paid by the tenant during the quarter to the actual amount of the Recoverable Expenses incurred by the Company for the same period. The difference, if any, is either charged or credited to the tenant pursuant to the provisions of the lease. In certain instances, the lease may restrict the amount the Company can recover from the tenant such as a cap on certain or all property operating expenses. In a situation in which a lease associated with a significant tenant has been, or is expected to be, terminated early, or extended, the Company evaluates the remaining useful life of amortizable assets in the asset group related to the lease that will be terminated (i.e., above- and below-market lease intangibles, in-place lease value and deferred leasing costs). Based upon consideration of the facts and circumstances surrounding the termination or extension, the Company may write-off or accelerate the amortization associated with the asset group. Such amounts are included within rental and other income for above- and below-market lease intangibles and amortization for the remaining lease related asset groups in the consolidated statements of operations.
Lease Accounting	Lease Accounting On January 1, 2019, the Company adopted ASC 842 using the modified retrospective approach and elected to apply the provisions as of the date of adoption on a prospective basis. Upon adoption of ASC 842, the Company elected the “package of practical expedients,” which allowed the Company to not reassess (a) whether expired or existing contracts as of January 1, 2019 are or contain leases, (b) the lease classification for any expired or existing leases as of January 1, 2019, and (c) the treatment of initial direct costs relating to any existing leases as of January 1, 2019. The package of practical expedients was made as a single election and was consistently applied to all leases that commenced before January 1, 2019. Lessor ASC 842 requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases, and operating leases. As the Company elected the package of practical expedients, the Company's existing leases as of January 1, 2019 continue to be accounted for as operating leases. Upon adoption of ASC 842, the Company elected the practical expedient permitting lessors to elect by class of underlying asset to not separate nonlease components (for example, maintenance services, including common area maintenance) from associated lease components (the “non-separation practical expedient”) if both of the following criteria are met: (1) the timing and pattern of transfer of the lease and non-lease component(s) are the same and (2) the lease component would be classified as an operating lease if it were accounted for separately. If both criteria are met, the combined component is accounted for in accordance with ASC 842 if the lease component is the predominant component of the combined component; otherwise, the combined component is accounted for in accordance with the revenue recognition standard. The Company assessed the criteria above with respect to the Company's operating leases and determined that they qualify for the non-separation practical expedient. As a result, the Company accounted for and presented all rental income earned pursuant to operating leases, including property expense recovery, as a single line item, “Rental income,” in the consolidated statement of operations for all periods presented. Prior to the adoption of ASC 842, the Company presented rental income, property expense recovery and other income related to leases separately in the Company's consolidated statements of operations. Under ASC 842, lessors are required to record revenues and expenses on a gross basis for lessor costs (which include real estate taxes) when these costs are reimbursed by a lessee. Conversely, lessors are required to record revenues and expenses on a net basis for lessor costs when they are paid by a lessee directly to a third party on behalf of the lessor. Prior to the adoption of ASC 842, the Company recorded revenues and expenses on a gross basis for real estate taxes whether they were reimbursed to the Company by a tenant or paid directly by a tenant to the taxing authorities on the Company's behalf. Effective January 1, 2019, the Company is recording these costs in accordance with ASC 842. Lessee ASC 842 requires lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset (“ROU asset”), which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. ASC 842 also requires lessees to classify leases as either finance or operating leases based on whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification is used to evaluate whether the lease expense should be recognized based on an effective interest method or on a straight-line basis over the term of the lease. On January 1, 2019, the Company was the lessee on two ground leases, which were classified as operating leases under ASC 840. As the Company elected the packages of practical expedients, the Company is not required to reassess the classification of these existing leases and, as such, these leases continue to be accounted for as operating leases. On January 1, 2019, the Company recognized ROU assets and lease liabilities for these leases on the Company's consolidated balance sheets, and on a go-forward basis, lease expense will be recognized on a straight-line basis over the remaining term of the lease. On January 1, 2019, the Company recorded a ROU asset of $25.5 million and a corresponding liability of approximately $27.6 million relating to the Company's existing ground lease arrangements. These operating leases were recognized based on the present value of the future minimum lease payments over the lease term. As these leases do not provide an implicit rate, the Company used its incremental borrowing rate based on the information available in determining the present value of future payments. The discount rate used to determine the present value of these operating leases’ future payments was 5.36%. There was no impact to beginning equity as a result of the adoption related to the lessee accounting as the difference between the asset and liability is attributed to derecognition of pre-existing straight-line rent balances. On March 1, 2019. the Company entered into an office lease located in Chicago, Illinois. The Company recorded a ROU asset of $0.6 million and a corresponding liability to the Company's lease agreements. The discount rate used to determine the present value of these operating leases’ future payments was 3.94%. On September 20, 2019, the Company acquired the McKesson II property and assumed a ground lease from the seller. The Company recorded a ROU asset of $16.3 million and a corresponding liability to the Company's existing ground lease agreements. The discount rate used to determine the present value of these operating leases’ future payments was 4.36%. Upon adoption of ASC 842, the Company also elected the practical expedient to not separate non-lease components, such as common area maintenance, from associated lease components for the Company's ground and office space leases.
Lease Accounting	Lease Accounting On January 1, 2019, the Company adopted ASC 842 using the modified retrospective approach and elected to apply the provisions as of the date of adoption on a prospective basis. Upon adoption of ASC 842, the Company elected the “package of practical expedients,” which allowed the Company to not reassess (a) whether expired or existing contracts as of January 1, 2019 are or contain leases, (b) the lease classification for any expired or existing leases as of January 1, 2019, and (c) the treatment of initial direct costs relating to any existing leases as of January 1, 2019. The package of practical expedients was made as a single election and was consistently applied to all leases that commenced before January 1, 2019. Lessor ASC 842 requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases, and operating leases. As the Company elected the package of practical expedients, the Company's existing leases as of January 1, 2019 continue to be accounted for as operating leases. Upon adoption of ASC 842, the Company elected the practical expedient permitting lessors to elect by class of underlying asset to not separate nonlease components (for example, maintenance services, including common area maintenance) from associated lease components (the “non-separation practical expedient”) if both of the following criteria are met: (1) the timing and pattern of transfer of the lease and non-lease component(s) are the same and (2) the lease component would be classified as an operating lease if it were accounted for separately. If both criteria are met, the combined component is accounted for in accordance with ASC 842 if the lease component is the predominant component of the combined component; otherwise, the combined component is accounted for in accordance with the revenue recognition standard. The Company assessed the criteria above with respect to the Company's operating leases and determined that they qualify for the non-separation practical expedient. As a result, the Company accounted for and presented all rental income earned pursuant to operating leases, including property expense recovery, as a single line item, “Rental income,” in the consolidated statement of operations for all periods presented. Prior to the adoption of ASC 842, the Company presented rental income, property expense recovery and other income related to leases separately in the Company's consolidated statements of operations. Under ASC 842, lessors are required to record revenues and expenses on a gross basis for lessor costs (which include real estate taxes) when these costs are reimbursed by a lessee. Conversely, lessors are required to record revenues and expenses on a net basis for lessor costs when they are paid by a lessee directly to a third party on behalf of the lessor. Prior to the adoption of ASC 842, the Company recorded revenues and expenses on a gross basis for real estate taxes whether they were reimbursed to the Company by a tenant or paid directly by a tenant to the taxing authorities on the Company's behalf. Effective January 1, 2019, the Company is recording these costs in accordance with ASC 842. Lessee ASC 842 requires lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset (“ROU asset”), which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. ASC 842 also requires lessees to classify leases as either finance or operating leases based on whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification is used to evaluate whether the lease expense should be recognized based on an effective interest method or on a straight-line basis over the term of the lease. On January 1, 2019, the Company was the lessee on two ground leases, which were classified as operating leases under ASC 840. As the Company elected the packages of practical expedients, the Company is not required to reassess the classification of these existing leases and, as such, these leases continue to be accounted for as operating leases. On January 1, 2019, the Company recognized ROU assets and lease liabilities for these leases on the Company's consolidated balance sheets, and on a go-forward basis, lease expense will be recognized on a straight-line basis over the remaining term of the lease. On January 1, 2019, the Company recorded a ROU asset of $25.5 million and a corresponding liability of approximately $27.6 million relating to the Company's existing ground lease arrangements. These operating leases were recognized based on the present value of the future minimum lease payments over the lease term. As these leases do not provide an implicit rate, the Company used its incremental borrowing rate based on the information available in determining the present value of future payments. The discount rate used to determine the present value of these operating leases’ future payments was 5.36%. There was no impact to beginning equity as a result of the adoption related to the lessee accounting as the difference between the asset and liability is attributed to derecognition of pre-existing straight-line rent balances. On March 1, 2019. the Company entered into an office lease located in Chicago, Illinois. The Company recorded a ROU asset of $0.6 million and a corresponding liability to the Company's lease agreements. The discount rate used to determine the present value of these operating leases’ future payments was 3.94%. On September 20, 2019, the Company acquired the McKesson II property and assumed a ground lease from the seller. The Company recorded a ROU asset of $16.3 million and a corresponding liability to the Company's existing ground lease agreements. The discount rate used to determine the present value of these operating leases’ future payments was 4.36%. Upon adoption of ASC 842, the Company also elected the practical expedient to not separate non-lease components, such as common area maintenance, from associated lease components for the Company's ground and office space leases.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities ASC 815, Derivatives and Hedging ("ASC 815") provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, ASC 815 requires qualitative disclosures regarding the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, the Company recorded all derivatives on the consolidated balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, and whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain risks, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. See Note 6, Interest Rate Contracts , for more detail.
Income Taxes	Income Taxes The Company has elected to be taxed as a REIT under the Internal Revenue Code ("Code"). To qualify as a REIT, the Company must meet certain organizational and operational requirements. The Company intends to adhere to these requirements and maintain its REIT status for the current year and subsequent years. As a REIT, the Company generally will not be subject to federal income taxes on taxable income that is distributed to stockholders. However, the Company may be subject to certain state and local taxes on its income and property, and federal income and excise taxes on its undistributed taxable income, if any. If the Company fails to qualify as a REIT in any taxable year, the Company will then be subject to federal income taxes on the taxable income at regular corporate rates and will not be permitted to qualify for treatment as a REIT for federal income tax purposes for four years following the year during which qualification is lost unless the Internal Revenue Service ("IRS") grants the Company relief under certain statutory provisions. Such an event could materially adversely affect net income and net cash available for distribution to stockholders. As of December 31, 2020, the Company satisfied the REIT requirements and distributed all of its taxable income.
Goodwill	GoodwillGoodwill represents the excess of consideration paid over the fair value of underlying identifiable net assets of business acquired. The Company's goodwill has an indeterminate life and is not amortized, but is tested for impairment on an annual basis, or more frequently if events or changes in circumstances indicate that the asset might be impaired. The Company takes a qualitative approach to consider whether an impairment of goodwill exists prior to quantitatively determining the fair value of the reporting unit in step one of the impairment test. The Company performs its annual assessment on October 1st.
Use of Estimates	Use of Estimates The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the unaudited consolidated financial statements and accompanying notes. Actual results could materially differ from those estimates.
Per Share Data	Per Share Data The Company reports earnings per share for the period as (1) basic earnings per share computed by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares outstanding during the period, and (2) diluted earnings per share computed by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares outstanding, including common stock equivalents. As of December 31, 2020 and December 31, 2019, there were no material common stock equivalents that would have a dilutive effect on earnings (loss) per share for common stockholders. During the year ended December 31, 2020, the Company retroactively adjusted the number of common shares outstanding in accordance with ASC 260-10, Earnings Per Share ("ASC 260-10"). ASC 260-10 requires the computations of basic and diluted earnings per share to be adjusted retroactively for all periods presented to reflect the change in capital structure if the
Segment Information	Segment Information ASC 280, Segment Reporting, establishes standards for reporting financial and descriptive information about a public entity’s reportable segments. The Company internally evaluates all of the properties and interests therein as one reportable segment.
Unaudited Data	Unaudited DataAny references to the number of buildings, square footage, number of leases, occupancy, and any amounts derived from these values in the notes to the consolidated financial statements are unaudited and outside the scope of the Company's independent registered public accounting firm's audit of its consolidated financial statements in accordance with the standards of the Public Company Accounting Oversight Board ("PCAOB").
Recently Issued Accounting Pronouncements and Adoption of New Accounting Pronouncements	Recently Issued Accounting Pronouncements Changes to GAAP are established by the FASB in the form of ASUs to the FASB’s Accounting Standards Codification. The Company considers the applicability and impact of all ASUs. Other than the ASUs discussed below, the FASB has not recently issued any other ASUs that the Company expects to be applicable and have a material impact on the Company's financial statements. Adoption of New Accounting Pronouncements During the first quarter of 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848). ASU 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance in ASU 2020-04 is optional and may be elected over time as reference rate reform activities occur. During the first quarter of 2020,

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Schedule of estimated useful lives of assets	The Company anticipates the estimated useful lives of its assets by class to be generally as follows: Buildings 25-40 years Building Improvements 5-20 years Land Improvements 15-25 years Tenant Improvements Shorter of estimated useful life or remaining contractual lease term Tenant Origination and Absorption Cost Remaining contractual lease term In-place Lease Valuation Remaining contractual lease term with consideration as to below-market extension options for below-market leases

Real Estate (Tables)

Real Estate (Tables)	12 Months Ended
	Dec. 31, 2020
Real Estate [Abstract]
Schedule of Acquisition Purchase Price and Allocation	The purchase price and other acquisition items for the property acquired during the year ended December 31, 2020 are shown below: Property Location Tenant/Major Lessee Acquisition Date Purchase Price Square Feet Acquisition Fees and Expenses Year of Lease Expiration Pepsi Bottling Ventures North Carolina PepsiCo 2/5/2020 $34,937 526,320 $386 2032
Schedule Of Asset Acquisition	The following summarizes the purchase price allocation of the property acquired during the year ended December 31, 2020: Property Land Building Improvements Tenant origination and absorption costs In-place lease valuation - (below) / market Debt discount / (premium) Total (1) Pepsi Bottling Ventures $3,407 $26,813 $954 $4,970 $(712) $(109) $35,323 (1) The allocations noted above are based on a determination of the relative fair value of the total consideration provided and represent the amount paid including capitalized acquisition costs.
Schedule of Company's Intangibles	The Company allocated a portion of the acquired and contributed real estate asset value to in-place lease valuation, tenant origination and absorption cost, and other intangibles, net of the write-off of intangibles for the years ended December 31, 2020 and 2019: December 31, 2020 2019 In-place lease valuation (above market) $ 43,576 $ 44,012 In-place lease valuation (above market) - accumulated amortization (35,604) (33,322) In-place lease valuation (above market), net 7,972 10,690 Ground leasehold interest (below market) 2,254 2,254 Ground leasehold interest (below market) - accumulated amortization (191) (164) Ground leasehold interest (below market), net 2,063 2,090 Intangible assets, net $ 10,035 $ 12,780 In-place lease valuation (below market) $ (68,334) $ (67,622) Land leasehold interest (above market) (3,072) (3,073) In-place lease valuation & land leasehold interest - accumulated amortization 44,073 38,890 Intangible liabilities, net $ (27,333) $ (31,805) Tenant origination and absorption cost $ 740,489 $ 744,773 Tenant origination and absorption cost - accumulated amortization (412,462) (354,379) Tenant origination and absorption cost, net $ 328,027 $ 390,394
Schedule of Estimated Annual Amortization (Income) Expense	The amortization of the intangible assets and other leasing costs for the respective periods is as follows: Amortization (income) expense for the year ended December 31, 2020 2019 2018 Above and below market leases, net $ (2,292) $ (3,201) $ (685) Tenant origination and absorption cost $ 62,459 $ 69,502 $ 55,464 Ground leasehold amortization (below market) $ (291) $ (52) $ 27 Other leasing costs amortization $ 4,908 $ 3,581 $ 3,557 The following table sets forth the estimated annual amortization (income) expense for in-place lease valuation, net, tenant origination and absorption costs, ground leasehold improvements, and other leasing costs as of December 31, 2020 for the next five years: Year In-place lease valuation, net Tenant origination and absorption costs Ground leasehold improvements Other leasing costs 2021 $ (2,118) $ 57,243 $ (290) $ 5,862 2022 $ (2,518) $ 54,114 $ (290) $ 5,867 2023 $ (2,465) $ 49,551 $ (290) $ 5,739 2024 $ (1,648) $ 37,371 $ (291) $ 5,504 2025 $ (1,186) $ 26,813 $ (290) $ 5,385
Restrictions on Cash and Cash Equivalents	Additionally, an ongoing replacement reserve is funded by certain tenants pursuant to each tenant’s respective lease as follows: Balance as of December 31, 2020 December 31, 2019 Cash reserves $ 20,385 $ 48,129 Restricted lockbox 13,967 10,301 Total $ 34,352 $ 58,430

Investments in Unconsolidated_2

Investments in Unconsolidated Entities (Tables)	12 Months Ended
	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Company's share of net earnings or losses and reduced by distributions	As of December 31, 2020, the balance of the investments is shown below : Digital Realty Heritage Commons X Total Balance as of December 31, 2019 $ 10,584 $ 444 $ 11,028 Net loss (164) — (164) Distributions (8,121) (410) (8,531) Contributions 8,160 — 8,160 Valuation adjustment (1) (4,453) — (4,453) Impairment (2) (1,906) — (1,906) Clawback receivable reclass (3) (4,100) — (4,100) Balance as of December 31, 2020 $ — $ 34 $ 34 (1) Amount represents a charge to arrive at the net realizable value as of December 31, 2020, which is included in the line item "(Loss) Gain from investment in unconsolidated entities" in the consolidated statement of operations. (2) Amount represents an impairment on the Company's Digital investment that the Company determined in connection with the preparation and review of the financial statements. Amount included in the line item "(Loss) Gain from investment in unconsolidated entities" in the consolidated statement of operations. (3) Amount represents a reclass of the clawback to other assets as disclosed above.

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of Debt	As of December 31, 2020 and December 31, 2019, the Company’s debt consisted of the following: December 31, Contractual Interest Rate (1) Loan Effective Interest Rate (2) 2020 2019 HealthSpring Mortgage Loan $ 20,208 $ 20,723 4.18% April 2023 4.62% Midland Mortgage Loan 98,155 100,249 3.94% April 2023 4.12% Emporia Partners Mortgage Loan 1,627 2,104 5.88% September 2023 5.96% Samsonite Loan 20,165 21,154 6.08% September 2023 5.09% Highway 94 Loan 14,689 15,610 3.75% August 2024 4.80% Pepsi Bottling Ventures Loan 18,587 — 3.69% October 2024 3.92% AIG Loan II 126,792 126,970 4.15% November 2025 4.93% BOA Loan 375,000 375,000 3.77% October 2027 3.91% BOA/KeyBank Loan 250,000 250,000 4.32% May 2028 4.14% AIG Loan 103,870 105,762 4.96% February 2029 5.08% Total Mortgage Debt 1,029,093 1,017,572 Revolving Credit Facility (3) 373,500 211,500 LIBO Rate + 1.60% June 2023 1.88% 2023 Term Loan 200,000 200,000 LIBO Rate + 1.55% June 2023 1.80% 2024 Term Loan 400,000 400,000 LIBO Rate + 1.55% April 2024 1.79% 2026 Term Loan 150,000 150,000 LIBO Rate + 1.85% April 2026 2.06% Total Debt 2,152,593 1,979,072 Unamortized Deferred Financing Costs and Discounts, net (12,166) (9,968) Total Debt, net $ 2,140,427 $ 1,969,104 (1) Including the effect of the interest rate swap agreements with a total notional amount of $750 million the weighted average interest rate as of December 31, 2020 was 3.58% for both the Company’s fixed-rate and variable-rate debt combined and 3.96% for the Company’s fixed-rate debt only. (2) Reflects the effective interest rate as of December 31, 2020 and includes the effect of amortization of discounts/premiums and deferred financing costs. (3) The LIBO rate as of December 1, 2020 (effective date) was 0.16%. The Revolving Credit Facility has an initial term of approximately two years, maturing on June 28, 2022, and may be extended for a one-year period if certain conditions are met and upon payment of an extension fee. See discussion below.
Summary of future principal repayments of all loans	The following summarizes the future scheduled principal repayments of all loans as of December 31, 2020 per the loan terms discussed above: As of December 31, 2020 2021 $ 9,587 2022 10,216 2023 337,387 2024 433,921 2025 120,111 Thereafter 1,241,371 Total principal 2,152,593 Unamortized debt premium/(discount) (577) Unamortized deferred loan costs (11,589) Total $ 2,140,427

Interest Rate Contracts (Tables

Interest Rate Contracts (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Interest Rate Swaps	The following table sets forth a summary of the interest rate swaps at December 31, 2020 and 2019: Fair Value (1) Current Notional Amounts December 31, December 31, Derivative Instrument Effective Date Maturity Date Interest Strike Rate 2020 2019 2020 2019 (Liabilities) Interest Rate Swap 3/10/2020 7/1/2025 0.83% $ (2,963) $ — $ 150,000 $ — Interest Rate Swap 3/10/2020 7/1/2025 0.84% (2,023) — 100,000 — Interest Rate Swap 3/10/2020 7/1/2025 0.86% (1,580) — 75,000 — Interest Rate Swap 7/1/2020 7/1/2025 2.82% (13,896) (7,038) 125,000 125,000 Interest Rate Swap 7/1/2020 7/1/2025 2.82% (11,140) (5,651) 100,000 100,000 Interest Rate Swap 7/1/2020 7/1/2025 2.83% (11,148) (5,665) 100,000 100,000 Interest Rate Swap 7/1/2020 7/1/2025 2.84% (11,225) (5,749) 100,000 100,000 Interest Rate Swap 7/9/2015 7/1/2020 1.69% — (43) — 425,000 Total $ (53,975) $ (24,146) $ 750,000 $ 850,000
Derivative Instruments, Gain (Loss)	The following table sets forth the impact of the interest rate swaps on the consolidated statements of operations for the periods presented: Year Ended December 31, 2020 2019 Interest Rate Swap in Cash Flow Hedging Relationship: Amount of (loss) gain recognized in AOCI on derivatives $ (38,319) $ (19,944) Amount of (gain) loss reclassified from AOCI into earnings under “Interest expense” $ 8,615 $ (2,359) Total interest expense presented in the consolidated statement of operations in which the effects of cash flow hedges are recorded $ 79,646 $ 73,557

Accrued Expenses and Other Li_2

Accrued Expenses and Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
Payables and Accruals [Abstract]
Schedule of Accrued Expenses and Other Liabilities	Accrued expenses and other liabilities consisted of the following as of December 31, 2020 and 2019: December 31, 2020 2019 Accrued tenant improvements $ 30,011 $ 11,802 Prepaid tenant rent 20,780 20,510 Real estate taxes payable 15,380 13,385 Deferred compensation 10,599 9,209 Interest payable 9,147 12,264 Property operating expense payable 8,473 7,752 Other liabilities 20,044 21,467 Total $ 114,434 $ 96,389

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Liabilities fair value measured on recurring basis	The following table sets forth the assets and liabilities that the Company measures at fair value on a recurring basis by level within the fair value hierarchy as of December 31, 2020 and 2019: Assets/(Liabilities) Total Fair Value Quoted Prices in Active Markets for Identical Assets and Liabilities Significant Other Observable Inputs Significant Unobservable Inputs December 31, 2020 Interest Rate Swap Liability $ (53,975) $ — $ (53,975) $ — Corporate Owned Life Insurance Asset $ 4,454 $ — $ 4,454 $ — Mutual Funds Asset $ 6,643 $ 6,643 $ — $ — Deferred Compensation Liability $ (10,599) $ — $ (10,599) $ — December 31, 2019 Interest Rate Swap Liability $ (24,146) $ — $ (24,146) $ — Earn-out Liability (due to affiliates) $ (2,919) $ — $ — $ (2,919) Corporate Owned Life Insurance Asset $ 2,134 $ — $ 2,134 $ — Mutual Funds Asset $ 6,983 $ 6,983 $ — $ — Deferred Compensation Liability $ (9,209) $ — $ (9,209) $ —
Quantitative Information Related to Non-recurring Fair Value Measurements	The following table is a summary of the quantitative information related to the non-recurring fair value measurement for the impairment of the Company's real estate properties for the year-ended December 31, 2020: Range of Inputs or Inputs Unobservable Inputs: 2200 Channahon Road Houston Westway I 2275 Cabot Drive Market rent per square foot $2.00 to $3.00 $15.00 to $17.00 $11.00 to $12.00 Terminal capitalization rate 9.75% 7.75% 9.00% Discount rate 14.00% 9.00% 10.25%
Schedule of carrying values and estimated fair values of financial instruments	The Company determined that the mortgage debt valuation in its entirety is classified in Level 2 of the fair value hierarchy, as the fair value is based on current pricing for debt with similar terms as the in-place debt. December 31, 2020 December 31, 2019 Fair Value Carrying Value (1) Fair Value Carrying Value (1) BOA Loan $ 355,823 $ 375,000 $ 369,343 $ 375,000 BOA/KeyBank Loan $ 263,454 $ 250,000 $ 264,101 $ 250,000 AIG Loan II $ 121,011 $ 126,792 $ 122,258 $ 126,970 AIG Loan $ 102,033 $ 103,870 $ 101,663 $ 105,762 Midland Mortgage Loan $ 97,709 $ 98,155 $ 99,318 $ 100,249 Samsonite Loan $ 21,030 $ 20,165 $ 22,103 $ 21,154 HealthSpring Mortgage Loan $ 20,462 $ 20,208 $ 20,868 $ 20,723 Pepsi Bottling Ventures Loan $ 18,942 $ 18,587 $ — $ — Highway 94 Loan $ 14,447 $ 14,689 $ 15,101 $ 15,610 Emporia Partners Mortgage Loan $ 1,654 $ 1,627 $ 2,105 $ 2,104 (1) The carrying values do not include the debt premium/(discount) or deferred financing costs as of December 31, 2020 and December 31, 2019. See Note 5, Debt

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Schedule of Stock Issued Under DRP Offering	The following table summarizes the DRP offerings ,by share class, as of December 31, 2020: Share Class Amount Shares Class A 6,923 743,349 Class AA 13,695 1,470,340 Class AAA 207 22,190 Class D 12 1,312 Class E 296,930 30,697,419 Class I 300 31,992 Class S 0 12 Class T 112 11,931 Total $ 318,179 32,978,545
Schedule of Stock Redemption Activity	The following table summarizes share redemption (excluding the self-tender offer) activity during the years ended December 31, 2020 and 2019: Year Ended December 31, 2020 2019 Shares of common stock redeemed 1,841,887 20,933,322 Weighted average price per share $ 9.01 $ 9.44
Unvested Shares of Restricted Stock Awards Activity	Number of Unvested Shares of Restricted Stock Awards Weighted-Average Grant Date Fair Value per Share Balance at December 31, 2018 — $ — Granted 1,009,415 $ 9.56 Forfeited — $ — Vested (252,354) $ 9.56 Balance at December 31, 2019 757,061 Granted 589,248 $ 9.35 Forfeited (3,744) $ 9.35 Vested (1) (398,729) $ 9.48 Balance at December 31, 2020 943,836
Schedule of Distributions Paid	The following unaudited table summarizes the federal income tax treatment for all distributions per share for the years ended December 31, 2020, 2019, and 2018 reported for federal tax purposes and serves as a designation of capital gain distributions, if applicable, pursuant to Code Section 857(b)(3)(C) and Treasury Regulation §1.857-6(e). Year Ended December 31, 2020 2019 2018 Ordinary income $ 0.13 33 % $ 0.22 37 % $ 0.32 47 % Capital gain — — % 0.08 13 % — — % Return of capital 0.27 67 % 0.30 50 % 0.36 53 % Total distributions paid $ 0.40 100 % $ 0.60 100 % $ 0.68 100 %

Noncontrolling Interests (Table

Noncontrolling Interests (Tables)	12 Months Ended
	Dec. 31, 2020
Noncontrolling Interest [Abstract]
Schedule of activity for noncontrolling interests	The following summarizes the activity for noncontrolling interests recorded as equity for the years ended December 31, 2020 and 2019: December 31, 2020 2019 Beginning balance $ 245,040 $ 232,203 Contributions/issuance of noncontrolling interests — 30,039 Reclass of noncontrolling interest subject to redemption 224 — Repurchase of noncontrolling interest (1,137) — Issuance of stock dividend for noncontrolling interest 1,068 1,861 Distributions to noncontrolling interests (13,306) (19,716) Allocated distributions to noncontrolling interests subject to redemption (29) (42) Net (loss) income (1,732) 3,749 Other comprehensive loss (3,578) (3,054) Ending balance $ 226,550 $ 245,040

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2020
Related Party Transaction, Due from (to) Related Party [Abstract]
Schedule of related party transactions	Summarized below are the related-party costs incurred by the Company for the years ended December 31, 2020, 2019 and 2018, respectively, and any related amounts receivable and payable as of December 31, 2020 and 2019: Incurred for the Year Ended December 31, Receivable as of December 31, 2020 2019 2018 2020 2019 Assets Assumed through the Self-Administration Transaction Cash to be received from an affiliate related to deferred compensation and other payroll costs $ — $ 658 $ — $ — $ — Other fees 243 — — 293 352 Due from GCC Reimbursable Expense Allocation 15 4 — 4 4 Payroll/Expense Allocation 653 481 — 1,114 481 Due from Affiliates Payroll/Expense Allocation — 1,217 — — — O&O Costs (including payroll allocated to O&O) — 157 — — — Other Fees — 6,375 — — — Total incurred/receivable $ 911 $ 8,892 $ — $ 1,411 $ 837 Incurred for the Year Ended December 31, Payable as of December 31, 2020 2019 2018 2020 2019 Expensed Operating expenses $ — $ — $ 3,594 $ — $ — Asset management fees — — 23,668 — — Property management fees — — 9,479 — — Disposition fees — 641 177 — — Costs advanced by the advisor 2,000 3,771 546 1,085 1,164 Consulting fee - shared services 2,500 2,500 — 695 441 Capitalized Acquisition fees — 942 5,331 — — Leasing commissions — 2,540 2,289 — — Assumed through Self- Administration Transaction/EA Mergers Earn-out — — — 262 2,919 Other Fees — 20 — — — Stockholder Servicing Fee — 692 — 494 4,994 Other Distributions 10,537 14,138 — 736 1,365 Total incurred/payable $ 15,037 $ 25,244 $ 45,084 $ 3,272 $ 10,883

Operating Leases (Tables)

Operating Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Undiscounted Cash Flow	December 31, 2020. As of December 31, 2020 2021 $ 300,861 2022 302,912 2023 289,261 2024 249,419 2025 208,153 Thereafter 937,408 Total $ 2,288,014
Lease Costs	As of Lease Term and Discount Rate December 31, 2020 December 31, 2019 Weighted-average remaining lease term in years. 80.1 80.9 Weighted-average discount rate (1) 4.98 % 4.98 % (1) Because the rate implicit in each of the Company's leases was not readily determinable, the Company used an incremental borrowing rate. In determining the Company's incremental borrowing rate for each lease, the Company considered recent rates on secured borrowings, observable risk-free interest rates and credit spreads correlating to the Company's creditworthiness, the impact of collateralization and the term of each of the Company's lease agreements.
Operating Lease Liability Maturity	Maturities of lease liabilities as of December 31, 2020 were as follows: December 31, 2020 2021 $ 1,632 2022 1,675 2023 1,741 2024 1,776 2025 1,727 Thereafter 285,011 Total undiscounted lease payments 293,562 Less imputed interest (247,916) Total lease liabilities $ 45,646

Organization (Details)

Organization (Details) $ in Thousands		24 Months Ended	30 Months Ended
		Sep. 30, 2019USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)realEstatePropertyshares	Oct. 29, 2020	Dec. 31, 2019USD ($)shares	Apr. 30, 2019shares	Jun. 30, 2015shares
Subsidiary, Sale of Stock [Line Items]
Units issued upon conversion (in shares)							1
Limited liability partnership interest held (percent)				87.80%
Proceeds from issuance of equity | $		$ 2,800,000	$ 2,800,000
Common stock, number of shares outstanding (in shares)				230,320,668		227,853,720
Common stock issued | $	[1]			$ 230		$ 228
Noncontrolling interest, units eligible towards redemption (in shares)				556,099		554,110
Sponsor and Affiliates
Subsidiary, Sale of Stock [Line Items]
Limited liability partnership interest held (percent)				10.60%
Number of properties contributed | realEstateProperty				5
Third parties
Subsidiary, Sale of Stock [Line Items]
Limited liability partnership interest held (percent)				1.60%
Private Offering
Subsidiary, Sale of Stock [Line Items]
Stock issued (shares)				284,595,718				43,772,611
Distribution Reinvestment Plan
Subsidiary, Sale of Stock [Line Items]
Common stock issued | $				$ 318,200		$ 293,700
Noncontrolling interest, units eligible towards redemption (in shares)				230,390
Common Class E
Subsidiary, Sale of Stock [Line Items]
Partnership units conversion ratio					1.392		1.04807
Common stock, number of shares outstanding (in shares)				155,272,273
Common Class E | Private Offering
Subsidiary, Sale of Stock [Line Items]
Stock issued (shares)							174,981,547
Board of Directors Chairman
Subsidiary, Sale of Stock [Line Items]
Partnership units owned (shares)				2,400,000
[1]	See Note 9, Equity , for the number of shares outstanding of each class of common stock as of December 31, 2020.

Basis of Presentation and Sum_4

Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details Textual)	12 Months Ended
	Dec. 31, 2020USD ($)reportableSegment	Dec. 31, 2019USD ($)
Accounting Policies [Abstract]
Cash equivalents | $	$ 0	$ 0
Reportable segments | reportableSegment	1

Basis of Presentation and Sum_5

Basis of Presentation and Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2020
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated life of assets	25 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated life of assets	40 years
Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated life of assets	5 years
Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated life of assets	20 years
Land Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated life of assets	15 years
Land Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated life of assets	25 years

Basis of Presentation and Sum_6

Basis of Presentation and Summary of Significant Accounting Policies - Leases (Details) $ in Thousands	Dec. 31, 2020USD ($)lease	Dec. 31, 2019USD ($)	Sep. 20, 2019USD ($)	Mar. 01, 2019USD ($)	Jan. 01, 2019USD ($)lease
Lessee, Lease, Description [Line Items]
Number of ground leases | lease	3				2
Right of use asset	$ 39,935	$ 41,347			$ 25,500
Lease liability	$ 45,646	$ 45,020			$ 27,600
Weighted-average discount rate (percent)	4.98%	4.98%			5.36%
McKesson II
Lessee, Lease, Description [Line Items]
Right of use asset			$ 16,300
Weighted-average discount rate (percent)			4.36%
Chicago, Illinois
Lessee, Lease, Description [Line Items]
Right of use asset				$ 600
Weighted-average discount rate (percent)				3.94%

Real Estate - Narrative (Detail

Real Estate - Narrative (Details) $ in Thousands	Dec. 22, 2020USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)staterealEstateProperty	Dec. 31, 2020USD ($)staterealEstateProperty	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Real Estate Properties [Line Items]
Number of properties | realEstateProperty			98	98
Number of states | state			25	25
Purchase price			$ 4,100,000	$ 4,100,000
Depreciation expense				93,980	$ 80,394	$ 60,120
Amortization of intangible assets				$ 67,076	$ 73,031	59,048
Useful life				6 years 9 months 29 days	7 years 4 months 9 days
Proceeds from disposition of properties				$ 51,692	$ 139,446	$ 11,442
Number of impaired properties | realEstateProperty			3
Bank of America II Property
Real Estate Properties [Line Items]
Proceeds from disposition of properties		$ 24,500
Gain on sale of property		4,300
Bank of America II Property | Land and Building [Member]
Real Estate Properties [Line Items]
Carrying value of property		$ 19,600
Bank of America I Property
Real Estate Properties [Line Items]
Proceeds from disposition of properties	$ 30,000
2200 Channahon Road and Houston Westway I [Member]
Real Estate Properties [Line Items]
Impairment of real estate				$ 23,500
Number of impaired properties | realEstateProperty				3
Discount rate | Maximum
Real Estate Properties [Line Items]
Discount rate (percent)			0.0625	0.0625

Real Estate - Summary of Proper

Real Estate - Summary of Property Acquired (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)ft²
Real Estate [Line Items]
Purchase Price	$ 4,100,000
Pepsi Bottling Ventures
Real Estate [Line Items]
Purchase Price	$ 34,937
Square Feet | ft²	526,320
Acquisition Fees and Expenses	$ 386

Real Estate - Final Purchase Pr

Real Estate - Final Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Real Estate [Line Items]
Land	$ 445,674	$ 458,339
In-place lease valuation - (below) / market	(68,334)	$ (67,622)
Debt discount / (premium)	577
Pepsi Bottling Ventures
Real Estate [Line Items]
Land	3,407
Building	26,813
Improvements	954
Tenant origination and absorption costs	4,970
In-place lease valuation - (below) / market	(712)
Debt discount / (premium)	(109)
Total	$ 35,323

Real Estate - Intangibles (Deta

Real Estate - Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Real Estate [Abstract]
In-place lease valuation (above market)	$ 43,576	$ 44,012
In-place lease valuation (above market) - accumulated amortization	(35,604)	(33,322)
In-place lease valuation (above market), net	7,972	10,690
Ground leasehold interest (below market)	2,254	2,254
Ground leasehold interest (below market) - accumulated amortization	(191)	(164)
Ground leasehold interest (below market), net	2,063	2,090
Intangible assets, net	10,035	12,780
In-place lease valuation (below market)	(68,334)	(67,622)
Land leasehold interest (above market)	(3,072)	(3,073)
In-place lease valuation & land leasehold interest - accumulated amortization	44,073	38,890
Intangible liabilities, net	(27,333)	(31,805)
Tenant origination and absorption cost	740,489	744,773
Tenant origination and absorption cost - accumulated amortization	(412,462)	(354,379)
Tenant origination and absorption cost, net	$ 328,027	$ 390,394

Real Estate - Amortization of I

Real Estate - Amortization of Intangible Assets and Other Leasing Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of amortization expense
Above and below market leases, net	$ (2,292)	$ (3,201)	$ (685)
Tenant origination and absorption cost	62,459	69,502	55,464
Ground leasehold amortization (below market)	(291)	(52)	27
Other leasing costs amortization	$ 4,908	$ 3,581	$ 3,557

Real Estate - Estimated Annual

Real Estate - Estimated Annual Amortization (Details) $ in Thousands	Dec. 31, 2020USD ($)
In-place lease valuation, net
2021	$ 2,118,000
2022	2,518,000
2023	(2,465,000)
2024	(1,648,000)
2025	(1,186)
Tenant origination and absorption costs
2021	57,243,000
2022	54,114,000
2023	49,551,000
2024	37,371,000
2025	26,813,000
Ground leasehold improvements
2021	(290,000)
2022	(290,000)
2023	(290,000)
2024	(291,000)
2025	(290,000)
Other leasing costs
2021	5,862,000
2022	5,867,000
2023	5,739,000
2024	5,504,000
2025	$ 5,385

Real Estate - Ongoing Replaceme

Real Estate - Ongoing Replacement Reserve (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Restricted Cash [Roll Forward]
Restricted cash	$ 34,352	$ 58,430
Real Estate Asset Acquisitions and Contributions
Restricted Cash [Roll Forward]
Restricted cash	34,352	58,430
Real Estate Asset Acquisitions and Contributions | Cash reserves
Restricted Cash [Roll Forward]
Restricted cash	20,385	48,129
Real Estate Asset Acquisitions and Contributions | Restricted lockbox
Restricted Cash [Roll Forward]
Restricted cash	$ 13,967	$ 10,301

Investments in Unconsolidated_3

Investments in Unconsolidated Entities - Narrative (Details)	1 Months Ended
	Sep. 30, 2014USD ($)termExtension	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Mar. 29, 2019USD ($)	Dec. 31, 2018ft²	Jun. 30, 2015ft²
Gain (Loss) on Securities [Line Items]
Gross acquisition value of property		$ 4,151,850,000	$ 4,175,502,000
Receivable as of December 31,		$ 1,411,000	$ 837,000
Heritage Commons X
Gain (Loss) on Securities [Line Items]
Area of equity method investments (in sqft) | ft²					200,000
Digital Realty
Gain (Loss) on Securities [Line Items]
Area of equity method investments (in sqft) | ft²						132,300
Ownership interest (percent)						80.00%
Contributions	$ 68,400,000
Gross acquisition value of property	187,500,000
Debt	$ 102,000,000
Operating lease term	3 years
Guaranteed minimum return		7.00%
Receivable as of December 31,		$ 4,100,000
Digital Realty | Secured Term Loan | Secured Debt
Gain (Loss) on Securities [Line Items]
Debt principal	$ 102,000,000
Number of debt term extensions | termExtension	2
Debt extension term	12 months
Letters of credit outstanding				$ 8,200,000
Mercedes-Benz Financial Services USA | Heritage Commons X
Gain (Loss) on Securities [Line Items]
Area of real estate leased		100.00%

Investments in Unconsolidated_4

Investments in Unconsolidated Entities - Share of Earnings and Losses of Investments (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity Method Investments [Roll Forward]
Balance as of December 31, 2019		$ 11,028
Net loss		(6,523)	$ (5,307)	$ (2,254)
Balance as of December 31, 2020		34	11,028
Investments
Equity Method Investments [Roll Forward]
Balance as of December 31, 2019		11,028
Net loss		(164)
Distributions		(8,531)
Contributions		8,160
Valuation adjustment		(4,453)
Impairment		(1,906)
Clawback receivable reclass		(4,100)
Balance as of December 31, 2020		34	11,028
Digital Realty
Equity Method Investments [Roll Forward]
Contributions	$ 68,400
Digital Realty | Investments
Equity Method Investments [Roll Forward]
Balance as of December 31, 2019		10,584
Net loss		(164)
Distributions		(8,121)
Contributions		8,160
Valuation adjustment		(4,453)
Impairment		(1,906)
Clawback receivable reclass		(4,100)
Balance as of December 31, 2020		0	10,584
Heritage Commons X | Investments
Equity Method Investments [Roll Forward]
Balance as of December 31, 2019		444
Net loss		0
Distributions		(410)
Contributions		0
Valuation adjustment		0
Balance as of December 31, 2020		$ 34	$ 444

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 18, 2020	Dec. 31, 2020	Sep. 01, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total Debt	$ 2,152,593		$ 2,152,593		$ 1,979,072
Unamortized Deferred Financing Costs and Premiums/(Discounts)	(12,166)		(12,166)		(9,968)
Debt, net	2,140,427		2,140,427		1,969,104
Term of debt instrument		5 years
LIBOR
Debt Instrument [Line Items]
Effective interest rate (percent)				0.16%
Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Total Debt	$ 373,500		$ 373,500		211,500
Effective interest rate (percent)	1.88%		1.88%
Term of debt instrument			2 years
Extended term on debt			1 year
Revolving Credit Facility | LIBOR | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate spread on the variable rate debt (percent)			1.60%
2023 Term Loan
Debt Instrument [Line Items]
Effective interest rate (percent)	1.80%		1.80%
2023 Term Loan | LIBOR
Debt Instrument [Line Items]
Interest rate spread on the variable rate debt (percent)			1.55%
2024 Term Loan
Debt Instrument [Line Items]
Effective interest rate (percent)	1.79%		1.79%
2024 Term Loan | LIBOR
Debt Instrument [Line Items]
Interest rate spread on the variable rate debt (percent)			1.55%
2026 Term Loan
Debt Instrument [Line Items]
Effective interest rate (percent)	2.06%		2.06%
2026 Term Loan | LIBOR
Debt Instrument [Line Items]
Interest rate spread on the variable rate debt (percent)			1.85%
Mortgages
Debt Instrument [Line Items]
Total Debt	$ 1,029,093		$ 1,029,093		1,017,572
Mortgages | HealthSpring Mortgage Loan
Debt Instrument [Line Items]
Total Debt	$ 20,208		$ 20,208		20,723
Contractual interest rate on fixed rate debt (percent)	4.18%		4.18%
Effective interest rate (percent)	4.62%		4.62%
Mortgages | Midland Mortgage Loan
Debt Instrument [Line Items]
Total Debt	$ 98,155		$ 98,155		100,249
Contractual interest rate on fixed rate debt (percent)	3.94%		3.94%
Effective interest rate (percent)	4.12%		4.12%
Mortgages | Emporia Partners Mortgage Loan
Debt Instrument [Line Items]
Total Debt	$ 1,627		$ 1,627		2,104
Contractual interest rate on fixed rate debt (percent)	5.88%		5.88%
Effective interest rate (percent)	5.96%		5.96%
Mortgages | Samsonite Loan
Debt Instrument [Line Items]
Total Debt	$ 20,165		$ 20,165		21,154
Contractual interest rate on fixed rate debt (percent)	6.08%		6.08%
Effective interest rate (percent)	5.09%		5.09%
Mortgages | Highway 94 Loan
Debt Instrument [Line Items]
Total Debt	$ 14,689		$ 14,689		15,610
Contractual interest rate on fixed rate debt (percent)	3.75%		3.75%
Effective interest rate (percent)	4.80%		4.80%
Mortgages | Pepsi Bottling Ventures Loan
Debt Instrument [Line Items]
Total Debt	$ 18,587		$ 18,587		0
Contractual interest rate on fixed rate debt (percent)	3.69%		3.69%
Effective interest rate (percent)	3.92%		3.92%
Mortgages | AIG Loan II
Debt Instrument [Line Items]
Total Debt	$ 126,792		$ 126,792		126,970
Contractual interest rate on fixed rate debt (percent)	4.15%		4.15%
Effective interest rate (percent)	4.93%		4.93%
Mortgages | BOA Loan
Debt Instrument [Line Items]
Total Debt	$ 375,000		$ 375,000		375,000
Contractual interest rate on fixed rate debt (percent)	3.77%		3.77%
Effective interest rate (percent)	3.91%		3.91%
Mortgages | BOA/KeyBank Loan
Debt Instrument [Line Items]
Total Debt	$ 250,000		$ 250,000		250,000
Contractual interest rate on fixed rate debt (percent)	4.32%		4.32%
Effective interest rate (percent)	4.14%		4.14%
Mortgages | AIG Loan
Debt Instrument [Line Items]
Total Debt	$ 103,870		$ 103,870		105,762
Contractual interest rate on fixed rate debt (percent)	4.96%		4.96%
Effective interest rate (percent)	5.08%		5.08%
Loans Payable | 2023 Term Loan
Debt Instrument [Line Items]
Total Debt	$ 200,000		$ 200,000		200,000
Term of debt instrument	5 years	5 years
Loans Payable | 2024 Term Loan
Debt Instrument [Line Items]
Total Debt	$ 400,000		400,000		400,000
Term of debt instrument	5 years	5 years
Loans Payable | 2026 Term Loan
Debt Instrument [Line Items]
Total Debt	$ 150,000		$ 150,000		$ 150,000
Term of debt instrument	7 years	7 years
Fixed and Variable Rate Debt
Debt Instrument [Line Items]
Weighted average interest rate of the fixed-rate debt (percent)	3.58%		3.58%
Fixed Rate Debt
Debt Instrument [Line Items]
Weighted average interest rate of the fixed-rate debt (percent)	3.96%		3.96%
Interest Rate Swap
Debt Instrument [Line Items]
Derivative, notional amount	$ 750,000		$ 750,000

Debt - Narrative (Details)

Debt - Narrative (Details)	Dec. 31, 2020USD ($)quarterrealEstateProperty	Dec. 18, 2020USD ($)	Dec. 31, 2020USD ($)quarterrealEstateProperty
Line of Credit Facility [Line Items]
Term of debt instrument		5 years
2023 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)			1.55%
2026 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)			1.85%
2024 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)			1.55%
Line of Credit | Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity		$ 1,900,000,000
Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Minimum number of Pool Properties under credit agreement | realEstateProperty	15		15
Maximum aggregated pool value that may be contributed by a single Pool Property or tenant (percent)	15.00%		15.00%
Maximum of aggregate pool value that may be contributed by Pool Properties subject to ground leases (percent)	15.00%		15.00%
Maximum aggregate pool value that may be contributed by Pool Properties under development or assets under renovation (percent)	20.00%		20.00%
Minimum aggregate leasing percentage of all Pool Properties (percent)	90.00%		90.00%
Maximum unsecured leverage ratio (percent)	60.00%		60.00%
Minimum unsecured interest coverage ratio	2		2
Unsecured Debt | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity		$ 750,000,000
Extended term on debt		1 year
Increase limit on borrowing capacity		$ 600,000,000
Remaining borrowing capacity	$ 221,900,000		$ 221,900,000
Loans Payable | 2023 Term Loan
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity		$ 200,000,000
Term of debt instrument	5 years	5 years
Loans Payable | 2023 Term Loan | External investment grade rating
Line of Credit Facility [Line Items]
Term of debt instrument	5 years
Loans Payable | 2026 Term Loan
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity		$ 150,000,000
Term of debt instrument	7 years	7 years
Loans Payable | 2026 Term Loan | External investment grade rating
Line of Credit Facility [Line Items]
Term of debt instrument	7 years
Loans Payable | 2024 Term Loan
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity		$ 400,000,000
Term of debt instrument	5 years	5 years
Loans Payable | 2024 Term Loan | External investment grade rating
Line of Credit Facility [Line Items]
Term of debt instrument	5 years
Loans Payable | 2025 Term Loan
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity		$ 400,000,000
Term of debt instrument	5 years	5 years
Commitment fee (percent)	0.20%
Loans Payable | 2025 Term Loan | External investment grade rating
Line of Credit Facility [Line Items]
Term of debt instrument	5 years
Loans Payable | Keybank Loans
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio (percent)	60.00%		60.00%
Maximum consolidated leverage ratio after material acquisition (percent)	65.00%		65.00%
Number of consecutive quarters subject to higher ratio | quarter			4
Minimum consolidated tangible net worth (percent)	75.00%		75.00%
Minimum consolidated tangible net worth	$ 2,000,000,000		$ 2,000,000,000
Tangible net worth, additional percentage of net future equity issuances (percent)	75.00%		75.00%
Tangible net worth, reduction for any payments used to redeem Company's or Borrower's stock (percent)	75.00%		75.00%
Minimum consolidated fixed charge coverage ratio	1.50		1.50
Maximum total secured debt ratio (percent)	40.00%		40.00%
Increase to maximum total secured debt ratio (percent)	5.00%		5.00%
Number of consecutive quarters subject to higher total secured debt ratio | quarter	4		4
Minimum unsecured interest coverage ratio	2		2
Maximum total secured recourse debt ratio (percent)	10.00%		10.00%
Aggregate maximum unhedged variable rate debt (percent)	30.00%		30.00%
Minimum | 2024 Term Loan | LIBOR | External investment grade rating
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	0.90%
Minimum | 2025 Term Loan | LIBOR | External investment grade rating
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	0.90%
Minimum | Unsecured Debt | Revolving Credit Facility | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	1.30%
Minimum | Unsecured Debt | Revolving Credit Facility | LIBOR | External investment grade rating
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	0.825%
Minimum | Loans Payable | 2023 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	1.25%
Minimum | Loans Payable | 2023 Term Loan | LIBOR | External investment grade rating
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	0.90%
Minimum | Loans Payable | 2026 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	1.65%
Minimum | Loans Payable | 2026 Term Loan | LIBOR | External investment grade rating
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	1.40%
Minimum | Loans Payable | 2024 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	1.25%
Minimum | Loans Payable | 2025 Term Loan
Line of Credit Facility [Line Items]
Commitment fee accrual period	120 days
Minimum | Loans Payable | 2025 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	1.25%
Maximum | Unsecured Debt | Revolving Credit Facility | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	2.20%
Maximum | Unsecured Debt | Revolving Credit Facility | LIBOR | External investment grade rating
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	1.55%
Maximum | Loans Payable | 2023 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	2.15%
Maximum | Loans Payable | 2023 Term Loan | LIBOR | External investment grade rating
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	1.75%
Maximum | Loans Payable | 2026 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	2.50%
Maximum | Loans Payable | 2026 Term Loan | LIBOR | External investment grade rating
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	2.35%
Maximum | Loans Payable | 2024 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	2.15%
Maximum | Loans Payable | 2024 Term Loan | LIBOR | External investment grade rating
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	1.75%
Maximum | Loans Payable | 2025 Term Loan
Line of Credit Facility [Line Items]
Commitment fee accrual period	180 days
Maximum | Loans Payable | 2025 Term Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	2.15%
Maximum | Loans Payable | 2025 Term Loan | LIBOR | External investment grade rating
Line of Credit Facility [Line Items]
Interest rate spread on the variable rate debt (percent)	1.75%

Debt - Maturity of Debt (Detail

Debt - Maturity of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Summary of future principal repayments of all loans
2021	$ 9,587
2022	10,216
2023	337,387
2024	433,921
2025	120,111
Thereafter	1,241,371
Total principal	2,152,593	$ 1,979,072
Unamortized debt premium/(discount)	(577)
Unamortized deferred loan costs	(11,589)
Debt, net	$ 2,140,427	$ 1,969,104

Interest Rate Contracts - Narra

Interest Rate Contracts - Narrative (Details)	Mar. 10, 2020USD ($)contract	Aug. 31, 2018USD ($)swapAgreement	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Jul. 09, 2015USD ($)swapAgreement
Derivative [Line Items]
Amount expected to be reclassified next 12 months			$ 13,800,000
Fair value, net			54,000,000	$ 24,100,000
Interest Rate Swap Effective Date July 1, 2020, $425,000 Notional Amount
Derivative [Line Items]
Number of instruments held | swapAgreement		4
Derivative, notional amount		$ 425,000,000
Derivative term		5 years
Interest Rate Swap, Effective March 10, 2020 - $150,000 Notional Amount, Interest Rate 0.83% [Member]
Derivative [Line Items]
Derivative, notional amount	$ 150,000,000		150,000,000	0
Fair value, net			2,963,000	0
Interest Rate Swap Effective Date July 1, 2020,$125,000 Notional Amount
Derivative [Line Items]
Derivative, notional amount	100,000,000		125,000,000	125,000,000
Fair value, net			13,896,000	7,038,000
Interest Rate Swap, Effective March 10, 2020 - $75,000 Notional Amount, Interest Rate 0.86%
Derivative [Line Items]
Derivative, notional amount	$ 75,000,000		75,000,000	0
Fair value, net			1,580,000	0
Interest Rate Swap
Derivative [Line Items]
Number of instruments held	3				1
Derivative, notional amount			750,000,000	850,000,000	$ 425,000,000
Derivative term	5 years
Fair value, net			$ 53,975,000	$ 24,146,000

Interest Rate Contracts - Summa

Interest Rate Contracts - Summary of Interest Rate Swaps (Details) - USD ($)	Dec. 31, 2020	Mar. 10, 2020	Dec. 31, 2019	Jul. 09, 2015
Derivative [Line Items]
Fair value, net	$ (54,000,000)		$ (24,100,000)
Interest Rate Swap
Derivative [Line Items]
Fair value, net	(53,975,000)		(24,146,000)
Derivative, notional amount	$ 750,000,000		850,000,000	$ 425,000,000
Interest Rate Swap, Effective March 10, 2020 - $150,000 Notional Amount, Interest Rate 0.83% [Member]
Derivative [Line Items]
Interest strike rate (percent)	0.83%
Fair value, net	$ (2,963,000)		0
Derivative, notional amount	$ 150,000,000	$ 150,000,000	0
Interest Rate Swap, Effective March 10, 2020 - $100,000 Notional Amount, Interest Rate 0.84% [Member]
Derivative [Line Items]
Interest strike rate (percent)	0.84%
Fair value, net	$ (2,023,000)		0
Derivative, notional amount	$ 100,000,000		0
Interest Rate Swap, Effective March 10, 2020 - $75,000 Notional Amount, Interest Rate 0.86%
Derivative [Line Items]
Interest strike rate (percent)	0.86%
Fair value, net	$ (1,580,000)		0
Derivative, notional amount	$ 75,000,000	75,000,000	0
Interest Rate Swap Effective Date July 1, 2020,$125,000 Notional Amount
Derivative [Line Items]
Interest strike rate (percent)	2.82%
Fair value, net	$ (13,896,000)		(7,038,000)
Derivative, notional amount	$ 125,000,000	$ 100,000,000	125,000,000
Interest Rate Swap Effective Date July 1, 2020, $100,000 Notional Amount
Derivative [Line Items]
Interest strike rate (percent)	2.82%
Fair value, net	$ (11,140,000)		(5,651,000)
Derivative, notional amount	$ 100,000,000		100,000,000
Interest Rate Swap Effective Date July 1, 2020, $100,000 Notional Amount
Derivative [Line Items]
Interest strike rate (percent)	2.83%
Fair value, net	$ (11,148,000)		(5,665,000)
Derivative, notional amount	$ 100,000,000		100,000,000
Interest Rate Swap Effective Date July 1, 2020, $100,000 Notional Amount
Derivative [Line Items]
Interest strike rate (percent)	2.84%
Fair value, net	$ (11,225,000)		(5,749,000)
Derivative, notional amount	$ 100,000,000		100,000,000
Interest Rate Swap Effective Date July 9, 2015
Derivative [Line Items]
Interest strike rate (percent)	1.69%
Fair value, net	$ 0		(43,000)
Derivative, notional amount	$ 0		$ 425,000,000

Interest Rate Contracts - Impac

Interest Rate Contracts - Impact of Interest Rate Swaps (Details) - Cash Flow Hedging - Interest Rate Swap - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Amount of (loss) gain recognized in AOCI on derivatives	$ (38,319)	$ (19,944)
Amount of (gain) loss reclassified from AOCI into earnings under “Interest expense”	8,615	(2,359)
Total interest expense presented in the consolidated statement of operations in which the effects of cash flow hedges are recorded	$ 79,646	$ 73,557

Accrued Expenses and Other Li_3

Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued tenant obligations	$ 30,011	$ 11,802	$ 0
Prepaid tenant rent	20,780	20,510
Real estate taxes payable	15,380	13,385
Deferred compensation	10,599	9,209
Interest payable	9,147	12,264
Property operating expense payable	8,473	7,752
Other liabilities	20,044	21,467
Total	$ 114,434	$ 96,389

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Liability	$ (53,975)	$ (24,146)
Earn-out Liability (due to affiliates)	(300)
Recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Corporate Owned Life Insurance Asset	4,454	2,134
Mutual Funds Asset	6,643	6,983
Deferred Compensation Liability	(10,599)	(9,209)
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Corporate Owned Life Insurance Asset	0	0
Mutual Funds Asset	6,643	6,983
Deferred Compensation Liability	0	0
Recurring basis | Significant Other Observable Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Corporate Owned Life Insurance Asset	4,454	2,134
Mutual Funds Asset	0	0
Deferred Compensation Liability	(10,599)	(9,209)
Recurring basis | Significant Unobservable Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Corporate Owned Life Insurance Asset	0	0
Mutual Funds Asset	0	0
Deferred Compensation Liability	0	0
Recurring basis | Interest Rate Swap
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Liability	(53,975)	(24,146)
Earn-out Liability (due to affiliates)		(2,919)
Recurring basis | Interest Rate Swap | Quoted Prices in Active Markets for Identical Assets and Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Liability	0	0
Earn-out Liability (due to affiliates)		0
Recurring basis | Interest Rate Swap | Significant Other Observable Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Liability	(53,975)	(24,146)
Earn-out Liability (due to affiliates)		0
Recurring basis | Interest Rate Swap | Significant Unobservable Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Liability	$ 0	0
Earn-out Liability (due to affiliates)		$ (2,919)

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2020USD ($)realEstateProperty	Sep. 30, 2020	Dec. 31, 2020USD ($)loan
Fair Value Disclosures [Abstract]
Number of impaired properties | realEstateProperty	3
Number of mortgage loans (in loan) | loan			10
Cash earn-out as percentage of advisory fees (percent)		37.25%
Earn-out consideration limit as percentage of common equity invested (percent)		2.50%
Change in amount of contingent liability			$ 2.6
Fair value of earn-outs	$ 0.3		0.3
Payment for contingent consideration			$ 0.1

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative Information (Details)	Dec. 31, 2020USD ($)
2200 Channahon Road | Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal capitalization rate	9.75%
Discount rate	14.00%
2200 Channahon Road | Minimum | Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 2
2200 Channahon Road | Maximum | Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 3
Houston Westway I | Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal capitalization rate	7.75%
Discount rate	9.00%
Houston Westway I | Minimum | Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 15
Houston Westway I | Maximum | Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 17
2275 Cabot Drive | Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal capitalization rate	9.00%
Discount rate	10.25%
2275 Cabot Drive | Minimum | Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 11
2275 Cabot Drive | Maximum | Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 12

Fair Value Measurements - Finan

Fair Value Measurements - Financial Instruments at Fair Value (Details) - Mortgages - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value | BOA Loan [Member] | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	$ 355,823	$ 369,343
Fair Value | BOA/KeyBank Loan | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	263,454	264,101
Fair Value | AIG Loan II | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	121,011	122,258
Fair Value | AIG Loan | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	102,033	101,663
Fair Value | Midland Mortgage Loan | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	97,709	99,318
Fair Value | Samsonite Loan | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	21,030	22,103
Fair Value | HealthSpring Mortgage Loan | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	20,462	20,868
Fair Value | Pepsi Bottling Ventures | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	18,942	0
Fair Value | Highway 94 Loan | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	14,447	15,101
Fair Value | Emporia Partners Mortgage Loan | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	1,654	2,105
Carrying Value | BOA Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	375,000	375,000
Carrying Value | BOA/KeyBank Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	250,000	250,000
Carrying Value | AIG Loan II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	126,792	126,970
Carrying Value | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	103,870	105,762
Carrying Value | Midland Mortgage Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	98,155	100,249
Carrying Value | Samsonite Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	20,165	21,154
Carrying Value | HealthSpring Mortgage Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	20,208	20,723
Carrying Value | Pepsi Bottling Ventures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	18,587	0
Carrying Value | Highway 94 Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	14,689	15,610
Carrying Value | Emporia Partners Mortgage Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	$ 1,627	$ 2,104

Equity - Narrative (Details)

Equity - Narrative (Details)

Jun. 15, 2020shares

Jan. 15, 2020USD ($)

May 01, 2019USD ($)

Aug. 08, 2018USD ($)tranche$ / sharesshares

Sep. 30, 2019USD ($)shares

Dec. 31, 2020USD ($)vote$ / sharesshares

Dec. 31, 2019USD ($)$ / sharesshares

Sep. 30, 2019USD ($)

Mar. 31, 2020USD ($)

Dec. 31, 2020USD ($)vote$ / sharesshares

Jul. 17, 2020USD ($)

Feb. 26, 2020USD ($)

Apr. 30, 2019shares

Dec. 31, 2018shares

Dec. 31, 2017shares

Jun. 30, 2015shares

Class of Stock [Line Items]

Common stock, number of shares outstanding (in shares)

230,320,668

227,853,720

230,320,668

Proceeds from issuance of equity | $

$ 2,800,000,000

$ 2,800,000,000

Common stock issued | $

[1]

$ 230,000

$ 228,000

$ 230,000

Share Redemption Program

Class of Stock [Line Items]

Minimum balance of common stock | $

$ 2,500

$ 2,500

Minimum holding period for redemption of stock

1 year

Share Redemption Program | Maximum

Class of Stock [Line Items]

Maximum redemption percentage of weighted average shares outstanding

5.00%

5.00%

Common Stock

Class of Stock [Line Items]

Common stock, number of shares outstanding (in shares)

230,320,668

227,853,720

230,320,668

174,278,341

179,121,568

Shares tendered by employees to satisfy employee tax withholding requirements upon vesting of restricted stock awards (shares)

78,849

Common Stock | Share Redemption Program

Class of Stock [Line Items]

Stock redeemed during period (in shares)

1,841,887

20,933,322

26,072,452

Stock redeemed, value | $

$ 245,300,000

Weighted average price per share (in usd per share) | $ / shares

$ 9.01

$ 9.44

$ 9.41

Shares redeemed (shares)

600,075

Primary offering

Class of Stock [Line Items]

Stock issued (shares)

284,595,718

284,595,718

43,772,611

Authorized issuances under Company's follow-on offering that have been suspended | $

$ 2,000,000,000

Follow-on Offering

Class of Stock [Line Items]

Authorized issuances under Company's follow-on offering that have been suspended | $

2,200,000,000

Distribution Reinvestment Plan

Class of Stock [Line Items]

Authorized issuances under Company's follow-on offering that have been suspended | $

$ 100,000,000

$ 200,000,000

Prior notice period to terminate plan

10 days

Common stock issued | $

$ 318,200,000

$ 293,700,000

$ 318,200,000

Common Class A

Class of Stock [Line Items]

Number of votes per share | vote

1

1

Common stock, number of shares outstanding (in shares)

24,325,680

24,325,680

Common Class AA

Class of Stock [Line Items]

Number of votes per share | vote

1

1

Common stock, number of shares outstanding (in shares)

47,304,097

47,304,097

Common Class AAA

Class of Stock [Line Items]

Number of votes per share | vote

1

1

Common stock, number of shares outstanding (in shares)

920,920

920,920

Common Class D

Class of Stock [Line Items]

Number of votes per share | vote

1

1

Common stock, number of shares outstanding (in shares)

41,095

41,095

Common Class E

Class of Stock [Line Items]

Number of votes per share | vote

1

1

Common stock, number of shares outstanding (in shares)

155,272,273

155,272,273

Common Class E | Share Redemption Program

Class of Stock [Line Items]

Share redemption requests in excess of limitation (shares)

2,872,488

Redemption requests | $

$ 27,400,000

Percentage of shares submitted (percent)

25.00%

Common Class E | Primary offering

Class of Stock [Line Items]

Stock issued (shares)

174,981,547

Common Class I

Class of Stock [Line Items]

Number of votes per share | vote

1

1

Common stock, number of shares outstanding (in shares)

1,896,696

1,896,696

Common Class S

Class of Stock [Line Items]

Number of votes per share | vote

1

1

Common stock, number of shares outstanding (in shares)

1,800

1,800

Common Class T

Class of Stock [Line Items]

Number of votes per share | vote

1

1

Common stock, number of shares outstanding (in shares)

558,107

558,107

Series A Preferred Shares | Series A Purchase Agreement

Class of Stock [Line Items]

Aggregate number of shares purchased (shares)

10,000,000

Stock price (in usd per share) | $ / shares

$ 25

Number of trancehs | tranche

2

Shares issued (shares)

5,000,000

Total purchase price | $

$ 125,000,000

Transaction fees (percent)

3.50%

Reimbursable transaction related expenses | $

$ 400,000

Restricted period before transferring shares

5 years

Redemption price per share (in usd per share) | $ / shares

$ 25

Series A Preferred Shares | Series A Purchase Agreement | Advisor

Class of Stock [Line Items]

Reimbursable transaction related expenses | $

$ 200,000

Series A Preferred Shares | Series A Purchase Agreement | After First Triggering Event but Before Reset Date

Class of Stock [Line Items]

Redemption fee (percent)

1.50%

Series A Preferred Shares | Series A Purchase Agreement | From and After Reset Date | Reference Period Two

Class of Stock [Line Items]

Initial annual distribution rate (percent)

6.75%

Series A Preferred Shares | Preferred Stock First Issuance

Class of Stock [Line Items]

Aggregate number of shares purchased (shares)

5,000,000

Shares issued (shares)

5,000,000

Conversion period from issuance

5 years

Series A Preferred Shares | Preferred Stock First Issuance | Reference Period One

Class of Stock [Line Items]

Initial annual distribution rate (percent)

6.55%

Redemption period

5 years

Series A Preferred Shares | Preferred Stock First Issuance | After First Triggering Event but Before Reset Date

Class of Stock [Line Items]

Redemption period

5 years

Series A Preferred Shares | Preferred Stock Secondary Issuance

Class of Stock [Line Items]

Aggregate number of shares purchased (shares)

5,000,000

Total purchase price | $

$ 125,000,000

Conversion period from issuance

5 years

Series A Preferred Shares | Preferred Stock Secondary Issuance | Reference Period One

Class of Stock [Line Items]

Initial annual distribution rate (percent)

6.55%

Redemption period

5 years

Series A Preferred Shares | Preferred Stock, Triggering Event | After First Triggering Event but Before Reset Date | Reference Period Three

Class of Stock [Line Items]

Initial annual distribution rate (percent)

7.55%

Series A Preferred Shares | Preferred Stock, Triggering Event | After First Triggering Event and Also After Reset Date | Reference Period Three

Class of Stock [Line Items]

Initial annual distribution rate (percent)

7.75%

Series A Preferred Shares | Preferred Stock, Reset Date | After First Triggering Event but Before Reset Date | Reference Period Three

Class of Stock [Line Items]

Initial annual distribution rate (percent)

8.05%

Series A Preferred Shares | Preferred Stock, Reset Date | From and After Reset Date | Reference Period Three

Class of Stock [Line Items]

Initial annual distribution rate (percent)

8.25%

Restricted Stock Units (RSUs)

Class of Stock [Line Items]

Total compensation expense | $

$ 5,200,000

$ 2,400,000

Share-based compensation, accelerated cost | $

1,400,000

Restricted Stock Units (RSUs) | 2019 Restricted Stock Units

Class of Stock [Line Items]

Fair value of grants issued | $

$ 9,700,000

Costs not yet recognized | $

$ 4,500,000

$ 4,500,000

Restricted shares issued (shares)

1,009,415

Vesting installments (percent)

25.00%

Recognition period for unrecognized expense

2 years

Restricted Stock Units (RSUs) | 2020 Restricted Stock Units

Class of Stock [Line Items]

Fair value of grants issued | $

$ 5,500,000

Costs not yet recognized | $

$ 3,600,000

$ 3,600,000

Vesting installment (percent)

25.00%

Restricted shares issued (shares)

589,248

Recognition period for unrecognized expense

3 years

Restricted Stock Units (RSUs) | Common Class E | Common Stock | 2020 Restricted Stock Units

Class of Stock [Line Items]

Number of shares contingently receivable for each RSU (share)

1

1

Restricted Stock | Independent directors

Class of Stock [Line Items]

Restricted shares issued (shares)

8,055

[1]

See Note 9, Equity , for the number of shares outstanding of each class of common stock as of December 31, 2020.

Equity - DRP Offerings by Share

Equity - DRP Offerings by Share Class (Details) - Distribution Reinvestment Plan $ in Thousands	5 Months Ended
	Dec. 31, 2020USD ($)shares
Class of Stock [Line Items]
Proceeds from issuance of private placement | $	$ 318,179
Gross proceeds from issuance of common stock (shares) | shares	32,978,545
Common Class A
Class of Stock [Line Items]
Proceeds from issuance of private placement | $	$ 6,923
Gross proceeds from issuance of common stock (shares) | shares	743,349
Common Class AA
Class of Stock [Line Items]
Proceeds from issuance of private placement | $	$ 13,695
Gross proceeds from issuance of common stock (shares) | shares	1,470,340
Common Class AAA
Class of Stock [Line Items]
Proceeds from issuance of private placement | $	$ 207
Gross proceeds from issuance of common stock (shares) | shares	22,190
Common Class D
Class of Stock [Line Items]
Proceeds from issuance of private placement | $	$ 12
Gross proceeds from issuance of common stock (shares) | shares	1,312
Common Class E
Class of Stock [Line Items]
Proceeds from issuance of private placement | $	$ 296,930
Gross proceeds from issuance of common stock (shares) | shares	30,697,419
Common Class I
Class of Stock [Line Items]
Proceeds from issuance of private placement | $	$ 300
Gross proceeds from issuance of common stock (shares) | shares	31,992
Common Class S
Class of Stock [Line Items]
Proceeds from issuance of private placement | $	$ 0
Gross proceeds from issuance of common stock (shares) | shares	12
Common Class T
Class of Stock [Line Items]
Proceeds from issuance of private placement | $	$ 112
Gross proceeds from issuance of common stock (shares) | shares	11,931

Equity - Schedule of Redemption

Equity - Schedule of Redemption Activity (Details) - Common Stock - Share Redemption Program - $ / shares	12 Months Ended		77 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020
Class of Stock [Line Items]
Shares of common stock redeemed (shares)	1,841,887	20,933,322	26,072,452
Weighted average price per share (in usd per share)	$ 9.01	$ 9.44	$ 9.41

Equity - Issuance of Restricted

Equity - Issuance of Restricted Stock Units (Details) - Restricted Stock Units (RSUs) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Number of Unvested Shares of Restricted Stock Awards
Balance at beginning of period (shares)	757,061	0
Forfeited (shares)	(3,744)	0
Vested (shares)	(398,729)	(252,354)
Balance at end of period (shares)	943,836	757,061
Weighted-Average Grant Date Fair Value per Share
Granted (in usd per share)	$ 9.35	$ 9.56
Forfeited (in usd per share)	9.35	0
Vested (in usd per share)	$ 9.48	$ 9.56
Employees
Number of Unvested Shares of Restricted Stock Awards
Vested (shares)	(78,849)

Equity - Schedule of Distributi

Equity - Schedule of Distributions Paid (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Ordinary income (in usd per share)	$ 0.13	$ 0.22	$ 0.32
Ordinary income (percent)	33.00%	37.00%	47.00%
Capital gain (in usd per share)	$ 0	$ 0.08	$ 0
Capital gain (percent)	0.00%	13.00%	0.00%
Return of capital (in usd per share)	$ 0.27	$ 0.30	$ 0.36
Return of capital (percent)	67.00%	50.00%	53.00%
Total distributions paid (in usd per share)	$ 0.40	$ 0.60	$ 0.68
Total distributions paid (percent)	100.00%	100.00%	100.00%

Noncontrolling Interests - Narr

Noncontrolling Interests - Narrative (Details) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020
Noncontrolling Interest [Line Items]
Percentage of noncontrolling interest based on weighted average shares (percent)		12.00%
Units issued related to property contributions (shares)		31,800,000
Units with a mandatory hold period (shares)		20,400,000
Units issued to unaffiliated third parties (shares)		200,000
Partnership unite exchange (shares)		1
Repurchase of noncontrolling interest (shares)	6,000	134,383
Griffin Capital Essential Asset Operating Partnership, L.P.
Noncontrolling Interest [Line Items]
Percentage of noncontrolling interests based on total shares (percent)		12.20%

Noncontrolling Interests - Acti

Noncontrolling Interests - Activity for Noncontrolling Interests (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of noncontrolling interest	$ (1,137)
Issuance of stock dividend for noncontrolling interest	1,068	$ 1,861
Distributions to noncontrolling interests	(13,306)	(19,716)	$ (4,368)
Net (loss) income	(14,690)	28,536	18,407
Other comprehensive loss	(29,704)	(22,520)	(5,179)
Non-controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	245,040	232,203
Contributions/issuance of noncontrolling interests	0	30,039
Reclass of noncontrolling interest subject to redemption	224	0
Repurchase of noncontrolling interest	(1,137)	0
Issuance of stock dividend for noncontrolling interest	1,068	1,861
Distributions to noncontrolling interests	(13,306)	(19,716)	(4,368)
Allocated distributions to noncontrolling interests subject to redemption	(29)	(42)
Net (loss) income	(1,732)	3,749	789
Other comprehensive loss	(3,578)	(3,054)	(310)
Ending balance	$ 226,550	$ 245,040	$ 232,203

Related Party Transactions - Sc

Related Party Transactions - Schedule of Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	$ 911	$ 8,892	$ 0
Receivable as of December 31,	1,411	837
Incurred for the Year Ended December 31,	15,037	25,244	45,084
Payable as of December 31,	3,272	10,883
Deferred Compensation and Other Payroll Costs [Member]
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	658	0
Receivable as of December 31,	0	0
Operating expenses
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	0	3,594
Payable as of December 31,	0	0
Asset management fees
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	0	23,668
Payable as of December 31,	0	0
Property management fees
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	0	9,479
Payable as of December 31,	0	0
Disposition fees
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	641	177
Payable as of December 31,	0	0
Costs advanced by the advisor
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	2,000	3,771	546
Payable as of December 31,	1,085	1,164
Consulting fee - shared services
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	2,500	2,500	0
Payable as of December 31,	695	441
Acquisition fees
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	942	5,331
Payable as of December 31,	0	0
Leasing commissions
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	2,540	2,289
Payable as of December 31,	0	0
Earn-out
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	0	0
Payable as of December 31,	262	2,919
Other Fees
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	243	0	0
Receivable as of December 31,	293	352
Incurred for the Year Ended December 31,	0	20	0
Payable as of December 31,	0	0
Stockholder Servicing Fee
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	692	0
Payable as of December 31,	494	4,994
Distributions
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	10,537	14,138	0
Payable as of December 31,	736	1,365
Griffin Capital Corporation | Payroll/Expense Allocation
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	15	4	0
Receivable as of December 31,	4	4
Griffin Capital Corporation | Payroll/Expense Allocation
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	653	481	0
Receivable as of December 31,	1,114	481
Griffin Capital Essential Asset REIT II | Payroll/Expense Allocation
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	1,217	0
Receivable as of December 31,	0	0
Griffin Capital Essential Asset REIT II | O&O Costs (including payroll allocated to O&O)
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	157	0
Receivable as of December 31,	0	0
Griffin Capital Essential Asset REIT II | Other Fees
Related Party Transaction [Line Items]
Incurred for the Year Ended December 31,	0	6,375	$ 0
Receivable as of December 31,	$ 0	$ 0

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)
Administrative Service Agreement | Griffin Capital Corporation
Related Party Transaction [Line Items]
Amount of transaction	$ 0.2

Operating Leases - Narrative (D

Operating Leases - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)lease	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Jan. 01, 2019lease
Lessee, Lease, Description [Line Items]
Lease income	$ 314.1	$ 291.4
Lease income recognized			$ 247.4
Number of ground leases | lease	3			2
Weighted-average remaining lease term in years.	80 years 1 month 6 days	80 years 10 months 24 days
Operating lease cost	$ 3.7	$ 2.8
Operating lease payments	$ 1.6	$ 1.2
Chicago Illinois Office
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term in years.	5 years

Operating Leases - Undiscounted

Operating Leases - Undiscounted cash flow (Details) $ in Thousands	Dec. 31, 2020USD ($)
Leases [Abstract]
2021	$ 300,861
2022	302,912
2023	289,261
2024	249,419
2025	208,153
Thereafter	937,408
Total	$ 2,288,014

Operating Leases - Cash paid fo

Operating Leases - Cash paid for Measurement of Lease Liabilities (Details)	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Weighted-average remaining lease term in years.	80 years 1 month 6 days	80 years 10 months 24 days
Weighted-average discount rate (percent)	4.98%	4.98%	5.36%

Operating Leases - Operating Le

Operating Leases - Operating Lease Liability Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
2021	$ 1,632
2022	1,675
2023	1,741
2024	1,776
2025	1,727
Thereafter	285,011
Total undiscounted lease payments	293,562
Less imputed interest	(247,916)
Total lease liabilities	$ 45,646	$ 45,020	$ 27,600

Declaration of Distributions (D

Declaration of Distributions (Details) - $ / shares	Dec. 17, 2020	Nov. 30, 2020	Oct. 19, 2020	Sep. 29, 2020
Declaration of Distributions [Abstract]
Dividends per share declared (in usd per share)	$ 0.000958904	$ 0.000956284	$ 0.000956284	$ 0.000956284
Annualized dividends declared per share (in usd per share)	$ 0.35	$ 0.35	$ 0.35	$ 0.35

Subsequent Events (Details)

Subsequent Events (Details) $ / shares in Units, $ in Thousands	Feb. 25, 2021$ / shares	Jan. 26, 2021$ / shares	Jan. 22, 2021USD ($)shares	Dec. 17, 2020$ / shares	Nov. 30, 2020$ / shares	Oct. 19, 2020$ / shares	Sep. 29, 2020$ / shares	Dec. 31, 2020USD ($)shares	Feb. 24, 2021USD ($)shares
Subsequent Event [Line Items]
Dividends per share declared (in usd per share) | $ / shares				$ 0.000958904	$ 0.000956284	$ 0.000956284	$ 0.000956284
Annualized dividends declared per share (in usd per share) | $ / shares				$ 0.35	$ 0.35	$ 0.35	$ 0.35
Subsequent Event
Subsequent Event [Line Items]
Dividends per share declared (in usd per share) | $ / shares	$ 0.000958904	$ 0.000958904
Annualized dividends declared per share (in usd per share) | $ / shares	$ 0.35	$ 0.35
Subsequent Event | Common Class E
Subsequent Event [Line Items]
Number of shares contingently receivable for each RSU (share)			1
Subsequent Event | Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Restricted shares issued (shares) | shares			1,071,347
Fair value of grants issued | $			$ 9,600
Distribution Reinvestment Plan
Subsequent Event [Line Items]
Number of shares issued (shares) | shares								32,978,545
Proceeds from issuance of private placement | $								$ 318,179
Distribution Reinvestment Plan | Common Class E
Subsequent Event [Line Items]
Number of shares issued (shares) | shares								30,697,419
Proceeds from issuance of private placement | $								$ 296,930
Distribution Reinvestment Plan | Subsequent Event
Subsequent Event [Line Items]
Number of shares issued (shares) | shares									33,532,756
Proceeds from issuance of private placement | $									$ 323,100

Schedule III Real Estate Asse_2

Schedule III Real Estate Assets and Accumulated Depreciation and Amortization - Schedule III (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate Properties [Line Items]
Encumbrances	$ 1,029,093
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	455,895
Building and Improvements	3,616,395
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	253,765
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	445,674
Building and Improvements	3,864,628
Total	4,310,302	$ 4,278,433	$ 3,073,364	$ 2,869,328
Accumulated Depreciation and Amortization	817,773	$ 668,104	$ 538,412	$ 426,752
Loan valuation discount	600
Aggregate cost of real estate owned for income tax purposes	$ 4,100,000
Plainfield | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Plainfield | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Renfro | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Renfro | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Emporia Partners | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Emporia Partners | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
AT&T | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
AT&T | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Westinghouse | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Westinghouse | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
TransDigm | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
TransDigm | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Atrium II | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Atrium II | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Zeller Plastik | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Zeller Plastik | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Northrop Grumman | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Northrop Grumman | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Health Net | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Health Net | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Comcast | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Comcast | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
500 Rivertech | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
500 Rivertech | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Schlumberger | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Schlumberger | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
UTC | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
UTC | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Avnet | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Avnet | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Cigna | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Cigna | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Amazon - Arlington Heights | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Amazon - Arlington Heights | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Verizon | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Verizon | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Fox Head | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Fox Head | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
2500 Windy Ridge | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
2500 Windy Ridge | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
General Electric | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
General Electric | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Atlanta Wildwood | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Atlanta Wildwood | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Community Insurance | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Community Insurance | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Anthem | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Anthem | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
JPMorgan Chase | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
JPMorgan Chase | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Sterling Commerce Center | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Sterling Commerce Center | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Aetna (Arlington) | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Aetna (Arlington) | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
CHRISTUS Health | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
CHRISTUS Health | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Roush Industries | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Roush Industries | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Parkland Center | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Parkland Center | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
1200 Morris | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
1200 Morris | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
United HealthCare | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
United HealthCare | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Intermec (Northpointe Corporate Center II) | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Intermec (Northpointe Corporate Center II) | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Comcast (Northpointe Corporate Center I) | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Comcast (Northpointe Corporate Center I) | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Farmers | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Farmers | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
2200 Channahon Road | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
2200 Channahon Road | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Digital Globe | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Digital Globe | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Waste Management | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Waste Management | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Wyndham Worldwide | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Wyndham Worldwide | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
ACE Hardware Corporation HQ | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
ACE Hardware Corporation HQ | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Equifax | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Equifax | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
American Express | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
American Express | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
SoftBank | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
SoftBank | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Vanguard | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Vanguard | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Parallon | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Parallon | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
TW Telecom | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
TW Telecom | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Equifax II | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Equifax II | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Mason I | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Mason I | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Wells Fargo (Charlotte) | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Wells Fargo (Charlotte) | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
GE Aviation | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
GE Aviation | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Westgate III | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Westgate III | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
2275 Cabot Drive | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
2275 Cabot Drive | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Franklin Center | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Franklin Center | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
4650 Lakehurst Court | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
4650 Lakehurst Court | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Miramar | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Miramar | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Royal Ridge V | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Royal Ridge V | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Duke Bridges | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Duke Bridges | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Houston Westway II | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Houston Westway II | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Houston Westway I | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Houston Westway I | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Atlanta Perimeter | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Atlanta Perimeter | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
South Lake at Dulles | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
South Lake at Dulles | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Four Parkway | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Four Parkway | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Highway 94 | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Highway 94 | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Heritage IV | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Heritage IV | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Samsonite | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Samsonite | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Restoration Hardware | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Restoration Hardware | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
HealthSpring | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
HealthSpring | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
LPL | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
LPL | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
LPL | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
LPL | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Quaker | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Quaker | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,955
Building and Improvements	15,540
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	5,436
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,955
Building and Improvements	20,976
Total	22,931
Accumulated Depreciation and Amortization	3,788
Operating Properties | Plainfield
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,709
Building and Improvements	22,209
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	7,344
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,709
Building and Improvements	29,552
Total	33,261
Accumulated Depreciation and Amortization	15,568
Operating Properties | Renfro
Real Estate Properties [Line Items]
Encumbrances	12,548
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,400
Building and Improvements	18,182
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,012
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,400
Building and Improvements	20,194
Total	21,594
Accumulated Depreciation and Amortization	9,595
Operating Properties | Emporia Partners
Real Estate Properties [Line Items]
Encumbrances	1,627
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	274
Building and Improvements	7,567
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	962
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	274
Building and Improvements	8,530
Total	8,804
Accumulated Depreciation and Amortization	3,216
Operating Properties | AT&T
Real Estate Properties [Line Items]
Encumbrances	24,167
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	6,770
Building and Improvements	32,420
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	718
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	6,770
Building and Improvements	33,138
Total	39,908
Accumulated Depreciation and Amortization	11,085
Operating Properties | Westinghouse
Real Estate Properties [Line Items]
Encumbrances	20,449
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,650
Building and Improvements	26,745
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	54
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,650
Building and Improvements	26,799
Total	29,449
Accumulated Depreciation and Amortization	9,550
Operating Properties | TransDigm
Real Estate Properties [Line Items]
Encumbrances	4,276
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,773
Building and Improvements	9,030
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	411
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,773
Building and Improvements	9,441
Total	13,214
Accumulated Depreciation and Amortization	3,056
Operating Properties | Atrium II
Real Estate Properties [Line Items]
Encumbrances	8,830
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,600
Building and Improvements	13,500
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	10,267
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,600
Building and Improvements	23,767
Total	26,367
Accumulated Depreciation and Amortization	6,864
Operating Properties | Zeller Plastik
Real Estate Properties [Line Items]
Encumbrances	8,365
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,674
Building and Improvements	13,229
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	651
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,674
Building and Improvements	13,881
Total	16,555
Accumulated Depreciation and Amortization	4,239
Operating Properties | Northrop Grumman
Real Estate Properties [Line Items]
Encumbrances	10,139
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,300
Building and Improvements	16,188
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	39
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,300
Building and Improvements	16,227
Total	17,527
Accumulated Depreciation and Amortization	6,887
Operating Properties | Health Net
Real Estate Properties [Line Items]
Encumbrances	12,548
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	4,182
Building and Improvements	18,072
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	324
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	4,182
Building and Improvements	18,396
Total	22,578
Accumulated Depreciation and Amortization	8,851
Operating Properties | Comcast
Real Estate Properties [Line Items]
Encumbrances	14,105
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,146
Building and Improvements	22,826
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,788
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,146
Building and Improvements	24,614
Total	27,760
Accumulated Depreciation and Amortization	11,021
Operating Properties | 500 Rivertech
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,000
Building and Improvements	9,000
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	6,784
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,000
Building and Improvements	15,784
Total	18,784
Accumulated Depreciation and Amortization	5,535
Operating Properties | Schlumberger
Real Estate Properties [Line Items]
Encumbrances	28,221
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,800
Building and Improvements	47,752
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,285
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,800
Building and Improvements	49,037
Total	51,837
Accumulated Depreciation and Amortization	13,537
Operating Properties | UTC
Real Estate Properties [Line Items]
Encumbrances	22,306
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,330
Building and Improvements	37,858
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,330
Building and Improvements	37,858
Total	39,188
Accumulated Depreciation and Amortization	11,482
Operating Properties | Avnet
Real Estate Properties [Line Items]
Encumbrances	18,644
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,860
Building and Improvements	31,481
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	47
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,860
Building and Improvements	31,528
Total	33,388
Accumulated Depreciation and Amortization	8,068
Operating Properties | Cigna
Real Estate Properties [Line Items]
Encumbrances	39,000
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	8,600
Building and Improvements	48,102
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	133
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	8,600
Building and Improvements	48,235
Total	56,835
Accumulated Depreciation and Amortization	14,678
Operating Properties | Amazon - Arlington Heights
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	7,697
Building and Improvements	21,843
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	5,879
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	7,697
Building and Improvements	27,722
Total	35,419
Accumulated Depreciation and Amortization	7,194
Operating Properties | Verizon
Real Estate Properties [Line Items]
Encumbrances	24,559
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	5,300
Building and Improvements	36,768
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	14,032
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	5,300
Building and Improvements	50,800
Total	56,100
Accumulated Depreciation and Amortization	17,817
Operating Properties | Fox Head
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,672
Building and Improvements	23,230
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,672
Building and Improvements	23,230
Total	26,902
Accumulated Depreciation and Amortization	5,916
Operating Properties | 2500 Windy Ridge
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	5,000
Building and Improvements	50,227
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	17,864
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	5,000
Building and Improvements	68,091
Total	73,091
Accumulated Depreciation and Amortization	17,417
Operating Properties | General Electric
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	5,050
Building and Improvements	51,396
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	132
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	5,050
Building and Improvements	51,529
Total	56,579
Accumulated Depreciation and Amortization	12,746
Operating Properties | Atlanta Wildwood
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	4,241
Building and Improvements	23,414
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	6,114
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	4,241
Building and Improvements	29,528
Total	33,769
Accumulated Depreciation and Amortization	10,079
Operating Properties | Community Insurance
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,177
Building and Improvements	22,323
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	3,725
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,177
Building and Improvements	26,047
Total	27,224
Accumulated Depreciation and Amortization	6,016
Operating Properties | Anthem
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	850
Building and Improvements	8,892
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	175
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	850
Building and Improvements	9,067
Total	9,917
Accumulated Depreciation and Amortization	3,016
Operating Properties | JPMorgan Chase
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	5,500
Building and Improvements	39,000
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	978
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	5,500
Building and Improvements	39,978
Total	45,478
Accumulated Depreciation and Amortization	11,296
Operating Properties | Sterling Commerce Center
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	4,750
Building and Improvements	32,769
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	5,400
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	4,750
Building and Improvements	38,170
Total	42,920
Accumulated Depreciation and Amortization	13,049
Operating Properties | Aetna (Arlington)
Real Estate Properties [Line Items]
Encumbrances	36,199
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,000
Building and Improvements	12,330
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	663
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,000
Building and Improvements	12,994
Total	15,994
Accumulated Depreciation and Amortization	4,843
Operating Properties | CHRISTUS Health
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,950
Building and Improvements	46,922
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	377
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,950
Building and Improvements	47,299
Total	49,249
Accumulated Depreciation and Amortization	15,805
Operating Properties | Roush Industries
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	875
Building and Improvements	11,375
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,492
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	875
Building and Improvements	13,867
Total	14,742
Accumulated Depreciation and Amortization	3,937
Operating Properties | Parkland Center
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,100
Building and Improvements	26,348
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	11,040
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,100
Building and Improvements	37,387
Total	40,487
Accumulated Depreciation and Amortization	17,841
Operating Properties | 1200 Morris
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,925
Building and Improvements	18,935
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,708
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,925
Building and Improvements	21,643
Total	24,568
Accumulated Depreciation and Amortization	8,235
Operating Properties | United HealthCare
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,920
Building and Improvements	23,510
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	8,969
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,920
Building and Improvements	32,478
Total	35,398
Accumulated Depreciation and Amortization	8,865
Operating Properties | Intermec (Northpointe Corporate Center II)
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,109
Building and Improvements	6,066
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	4,576
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,109
Building and Improvements	10,642
Total	11,751
Accumulated Depreciation and Amortization	3,831
Operating Properties | Comcast (Northpointe Corporate Center I)
Real Estate Properties [Line Items]
Encumbrances	39,650
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,292
Building and Improvements	16,930
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,324
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,292
Building and Improvements	19,254
Total	21,546
Accumulated Depreciation and Amortization	5,486
Operating Properties | Farmers
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,750
Building and Improvements	17,106
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	816
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,750
Building and Improvements	17,923
Total	20,673
Accumulated Depreciation and Amortization	6,400
Operating Properties | 2200 Channahon Road
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	6,000
Building and Improvements	46,511
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	(24,957)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,066
Building and Improvements	25,488
Total	27,554
Accumulated Depreciation and Amortization	14,718
Operating Properties | Digital Globe
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	8,600
Building and Improvements	83,400
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	8,600
Building and Improvements	83,400
Total	92,000
Accumulated Depreciation and Amortization	22,299
Operating Properties | Waste Management
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	0
Building and Improvements	16,515
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	82
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	0
Building and Improvements	16,597
Total	16,597
Accumulated Depreciation and Amortization	5,390
Operating Properties | Wyndham Worldwide
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	6,200
Building and Improvements	91,153
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,494
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	6,200
Building and Improvements	93,647
Total	99,847
Accumulated Depreciation and Amortization	19,388
Operating Properties | ACE Hardware Corporation HQ
Real Estate Properties [Line Items]
Encumbrances	22,750
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	6,900
Building and Improvements	33,945
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	6,900
Building and Improvements	33,945
Total	40,845
Accumulated Depreciation and Amortization	8,693
Operating Properties | Equifax
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,850
Building and Improvements	12,709
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	578
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,850
Building and Improvements	13,287
Total	15,137
Accumulated Depreciation and Amortization	4,624
Operating Properties | American Express
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	15,000
Building and Improvements	45,893
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	5,408
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	15,000
Building and Improvements	51,300
Total	66,300
Accumulated Depreciation and Amortization	19,104
Operating Properties | SoftBank
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	22,789
Building and Improvements	68,950
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	4,704
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	22,789
Building and Improvements	73,654
Total	96,443
Accumulated Depreciation and Amortization	24,810
Operating Properties | Vanguard
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,230
Building and Improvements	31,062
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	819
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,230
Building and Improvements	31,881
Total	34,111
Accumulated Depreciation and Amortization	8,614
Operating Properties | Parallon
Real Estate Properties [Line Items]
Encumbrances	6,971
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,000
Building and Improvements	16,772
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,000
Building and Improvements	16,772
Total	17,772
Accumulated Depreciation and Amortization	4,519
Operating Properties | TW Telecom
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	10,554
Building and Improvements	35,817
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,474
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	10,554
Building and Improvements	37,292
Total	47,846
Accumulated Depreciation and Amortization	10,947
Operating Properties | Equifax II
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,200
Building and Improvements	12,755
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	266
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,200
Building and Improvements	13,022
Total	15,222
Accumulated Depreciation and Amortization	3,920
Operating Properties | Mason I
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	4,777
Building and Improvements	18,489
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	746
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	4,777
Building and Improvements	19,235
Total	24,012
Accumulated Depreciation and Amortization	2,928
Operating Properties | Wells Fargo (Charlotte)
Real Estate Properties [Line Items]
Encumbrances	26,975
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,150
Building and Improvements	40,806
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	46
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,150
Building and Improvements	40,852
Total	43,002
Accumulated Depreciation and Amortization	9,743
Operating Properties | GE Aviation
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	4,400
Building and Improvements	61,681
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	4,400
Building and Improvements	61,681
Total	66,081
Accumulated Depreciation and Amortization	15,656
Operating Properties | Westgate III
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,209
Building and Improvements	75,937
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,209
Building and Improvements	75,937
Total	79,146
Accumulated Depreciation and Amortization	16,145
Operating Properties | 2275 Cabot Drive
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,788
Building and Improvements	16,200
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	(10,796)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	373
Building and Improvements	7,818
Total	8,191
Accumulated Depreciation and Amortization	6,504
Operating Properties | Franklin Center
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	6,989
Building and Improvements	46,875
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,436
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	6,989
Building and Improvements	48,311
Total	55,300
Accumulated Depreciation and Amortization	9,780
Operating Properties | 4650 Lakehurst Court
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,943
Building and Improvements	22,651
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	808
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,943
Building and Improvements	23,459
Total	26,402
Accumulated Depreciation and Amortization	8,308
Operating Properties | Miramar
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	4,488
Building and Improvements	19,979
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,233
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	4,488
Building and Improvements	22,212
Total	26,700
Accumulated Depreciation and Amortization	5,145
Operating Properties | Royal Ridge V
Real Estate Properties [Line Items]
Encumbrances	21,385
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,842
Building and Improvements	22,052
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	3,667
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,842
Building and Improvements	25,719
Total	27,561
Accumulated Depreciation and Amortization	5,507
Operating Properties | Duke Bridges
Real Estate Properties [Line Items]
Encumbrances	27,475
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	8,239
Building and Improvements	51,395
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	7,867
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	8,239
Building and Improvements	59,263
Total	67,502
Accumulated Depreciation and Amortization	11,167
Operating Properties | Houston Westway II
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,961
Building and Improvements	78,668
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,461
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,961
Building and Improvements	80,129
Total	84,090
Accumulated Depreciation and Amortization	19,740
Operating Properties | Houston Westway I
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	6,540
Building and Improvements	30,703
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	(2,647)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,668
Building and Improvements	16,175
Total	18,843
Accumulated Depreciation and Amortization	6,425
Operating Properties | Atlanta Perimeter
Real Estate Properties [Line Items]
Encumbrances	69,461
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	8,382
Building and Improvements	96,718
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	957
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	8,382
Building and Improvements	97,675
Total	106,057
Accumulated Depreciation and Amortization	31,017
Operating Properties | South Lake at Dulles
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	9,666
Building and Improvements	74,098
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	26,501
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	9,666
Building and Improvements	100,599
Total	110,265
Accumulated Depreciation and Amortization	18,592
Operating Properties | Four Parkway
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	4,339
Building and Improvements	37,298
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	4,228
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	4,339
Building and Improvements	41,526
Total	45,865
Accumulated Depreciation and Amortization	11,510
Operating Properties | Highway 94
Real Estate Properties [Line Items]
Encumbrances	14,689
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	5,637
Building and Improvements	25,280
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	5,637
Building and Improvements	25,280
Total	30,917
Accumulated Depreciation and Amortization	6,306
Operating Properties | Heritage IV
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,330
Building and Improvements	26,376
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	4,744
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,330
Building and Improvements	31,120
Total	33,450
Accumulated Depreciation and Amortization	6,209
Operating Properties | Samsonite
Real Estate Properties [Line Items]
Encumbrances	20,165
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	5,040
Building and Improvements	42,490
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	11
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	5,040
Building and Improvements	42,501
Total	47,541
Accumulated Depreciation and Amortization	7,711
Operating Properties | Restoration Hardware
Real Estate Properties [Line Items]
Encumbrances	78,000
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	15,463
Building and Improvements	36,613
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	37,693
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	15,463
Building and Improvements	74,305
Total	89,768
Accumulated Depreciation and Amortization	18,432
Operating Properties | HealthSpring
Real Estate Properties [Line Items]
Encumbrances	20,208
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	8,126
Building and Improvements	31,447
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	43
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	8,126
Building and Improvements	31,490
Total	39,616
Accumulated Depreciation and Amortization	6,971
Operating Properties | LPL
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	4,612
Building and Improvements	86,352
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	4,612
Building and Improvements	86,352
Total	90,964
Accumulated Depreciation and Amortization	7,821
Operating Properties | LPL
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,274
Building and Improvements	41,509
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,273
Building and Improvements	41,509
Total	42,782
Accumulated Depreciation and Amortization	3,760
Operating Properties | Quaker
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	5,433
Building and Improvements	55,341
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	5,433
Building and Improvements	55,341
Total	60,774
Accumulated Depreciation and Amortization	4,760
Operating Properties | McKesson
Real Estate Properties [Line Items]
Encumbrances	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	312
Building and Improvements	69,760
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	312
Building and Improvements	69,760
Total	70,072
Accumulated Depreciation and Amortization	$ 9,879
Operating Properties | McKesson | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | McKesson | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Shaw Industries
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	5,465
Building and Improvements	57,116
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	5,465
Building and Improvements	57,116
Total	62,581
Accumulated Depreciation and Amortization	$ 4,737
Operating Properties | Shaw Industries | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Shaw Industries | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | GEAR Entities
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,584
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,584
Building and Improvements	0
Total	1,584
Accumulated Depreciation and Amortization	0
Operating Properties | Owens Corning
Real Estate Properties [Line Items]
Encumbrances	3,295
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	867
Building and Improvements	4,418
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	901
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	867
Building and Improvements	5,319
Total	6,186
Accumulated Depreciation and Amortization	$ 500
Operating Properties | Owens Corning | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Owens Corning | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Westgate II
Real Estate Properties [Line Items]
Encumbrances	$ 34,152
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	7,716
Building and Improvements	48,422
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	870
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	7,716
Building and Improvements	49,292
Total	57,008
Accumulated Depreciation and Amortization	$ 5,047
Operating Properties | Westgate II | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Westgate II | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Administrative Office of Pennsylvania Courts
Real Estate Properties [Line Items]
Encumbrances	$ 6,061
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,246
Building and Improvements	9,626
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	498
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,246
Building and Improvements	10,125
Total	11,371
Accumulated Depreciation and Amortization	$ 972
Operating Properties | Administrative Office of Pennsylvania Courts | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Administrative Office of Pennsylvania Courts | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | American Express Center
Real Estate Properties [Line Items]
Encumbrances	$ 54,823
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	10,595
Building and Improvements	82,098
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	3,109
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	10,595
Building and Improvements	85,207
Total	95,802
Accumulated Depreciation and Amortization	$ 9,882
Operating Properties | American Express Center | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | American Express Center | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | MGM Corporate Center
Real Estate Properties [Line Items]
Encumbrances	$ 18,154
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	4,546
Building and Improvements	25,825
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,223
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	4,546
Building and Improvements	27,049
Total	31,595
Accumulated Depreciation and Amortization	$ 2,823
Operating Properties | MGM Corporate Center | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | MGM Corporate Center | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | American Showa
Real Estate Properties [Line Items]
Encumbrances	$ 10,306
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,214
Building and Improvements	16,538
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,427
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,214
Building and Improvements	18,965
Total	20,179
Accumulated Depreciation and Amortization	$ 1,588
Operating Properties | American Showa | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | American Showa | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Huntington Ingalls
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	6,213
Building and Improvements	29,219
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,670
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	6,213
Building and Improvements	31,889
Total	38,102
Accumulated Depreciation and Amortization	$ 2,712
Operating Properties | Huntington Ingalls | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Huntington Ingalls | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Wyndham
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	9,677
Building and Improvements	71,316
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,742
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	9,677
Building and Improvements	73,058
Total	82,735
Accumulated Depreciation and Amortization	$ 5,678
Operating Properties | Wyndham | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Wyndham | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Exel
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	978
Building and Improvements	14,137
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,568
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	978
Building and Improvements	16,705
Total	17,683
Accumulated Depreciation and Amortization	$ 1,941
Operating Properties | Exel | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Exel | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Rapiscan Systems
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,006
Building and Improvements	10,270
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	484
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,006
Building and Improvements	10,755
Total	12,761
Accumulated Depreciation and Amortization	$ 1,013
Operating Properties | Rapiscan Systems | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Rapiscan Systems | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Aetna
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	2,332
Building and Improvements	18,486
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,598
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	2,332
Building and Improvements	20,084
Total	22,416
Accumulated Depreciation and Amortization	$ 2,003
Operating Properties | Aetna | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Aetna | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Atlas Copco
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,156
Building and Improvements	18,297
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,505
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,156
Building and Improvements	19,802
Total	20,958
Accumulated Depreciation and Amortization	$ 1,729
Operating Properties | Atlas Copco | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Atlas Copco | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Toshiba TEC
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,916
Building and Improvements	36,374
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,423
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,916
Building and Improvements	38,796
Total	40,712
Accumulated Depreciation and Amortization	$ 3,246
Operating Properties | Toshiba TEC | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Toshiba TEC | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | NETGEAR
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	22,600
Building and Improvements	28,859
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,700
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	22,600
Building and Improvements	30,559
Total	53,159
Accumulated Depreciation and Amortization	$ 3,799
Operating Properties | NETGEAR | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | NETGEAR | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Nike
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	8,186
Building and Improvements	41,184
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,164
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	8,187
Building and Improvements	43,347
Total	51,534
Accumulated Depreciation and Amortization	$ 5,512
Operating Properties | Nike | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Nike | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Zebra Technologies
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	5,927
Building and Improvements	58,688
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,255
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	5,927
Building and Improvements	59,943
Total	65,870
Accumulated Depreciation and Amortization	$ 6,168
Operating Properties | Zebra Technologies | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Zebra Technologies | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | WABCO
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	1,226
Building and Improvements	13,902
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	839
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	1,226
Building and Improvements	14,741
Total	15,967
Accumulated Depreciation and Amortization	$ 860
Operating Properties | WABCO | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | WABCO | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | IGT
Real Estate Properties [Line Items]
Encumbrances	$ 45,300
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	5,673
Building and Improvements	67,610
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	2,021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	5,673
Building and Improvements	69,631
Total	75,304
Accumulated Depreciation and Amortization	$ 4,501
Operating Properties | IGT | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | IGT | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | 3M
Real Estate Properties [Line Items]
Encumbrances	$ 43,600
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	5,802
Building and Improvements	75,758
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	6,391
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	5,802
Building and Improvements	82,148
Total	87,950
Accumulated Depreciation and Amortization	$ 4,388
Operating Properties | 3M | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | 3M | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Amazon - Etna
Real Estate Properties [Line Items]
Encumbrances	$ 61,500
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	4,773
Building and Improvements	95,475
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	11,546
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	4,773
Building and Improvements	107,021
Total	111,794
Accumulated Depreciation and Amortization	$ 6,799
Operating Properties | Amazon - Etna | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Amazon - Etna | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Zoetis
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,718
Building and Improvements	44,082
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	735
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,718
Building and Improvements	44,817
Total	48,535
Accumulated Depreciation and Amortization	$ 3,268
Operating Properties | Zoetis | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Zoetis | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Southern Company
Real Estate Properties [Line Items]
Encumbrances	$ 99,600
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	7,794
Building and Improvements	157,724
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	1,457
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	7,794
Building and Improvements	159,181
Total	166,975
Accumulated Depreciation and Amortization	$ 7,615
Life on which depreciation in latest income statement is computed	38 years
Operating Properties | Allstate
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,109
Building and Improvements	13,096
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	553
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,109
Building and Improvements	13,649
Total	16,758
Accumulated Depreciation and Amortization	$ 1,214
Operating Properties | Allstate | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Allstate | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | MISO
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,725
Building and Improvements	25,848
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	971
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,725
Building and Improvements	26,820
Total	30,545
Accumulated Depreciation and Amortization	$ 2,074
Operating Properties | MISO | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | MISO | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | McKesson II
Real Estate Properties [Line Items]
Encumbrances	$ 0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	0
Building and Improvements	36,959
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	4,681
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	0
Building and Improvements	41,640
Total	41,640
Accumulated Depreciation and Amortization	$ 2,794
Operating Properties | McKesson II | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | McKesson II | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Pepsi Bottling Ventures
Real Estate Properties [Line Items]
Encumbrances	$ 18,590
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	3,407
Building and Improvements	31,783
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	954
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	3,407
Building and Improvements	32,734
Total	36,141
Accumulated Depreciation and Amortization	$ 1,033
Operating Properties | Pepsi Bottling Ventures | Minimum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	5 years
Operating Properties | Pepsi Bottling Ventures | Maximum
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Life on which depreciation in latest income statement is computed	40 years
Operating Properties | Others
Real Estate Properties [Line Items]
Encumbrances
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Land	0
Building and Improvements	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition [Abstract]
Building and Improvements	95
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Investment Property, Net [Abstract]
Land	0
Building and Improvements	95
Total	95
Accumulated Depreciation and Amortization	$ 26

Schedule III Real Estate Asse_3

Schedule III Real Estate Assets and Accumulated Depreciation and Amortization - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Real estate facilities
Balance at beginning of year	$ 4,278,433	$ 3,073,364	$ 2,869,328
Acquisitions	36,144	1,305,998	193,430
Construction costs and improvements	72,306	51,440	26,883
Impairment provision	(23,472)	(30,734)	0
Sale of real estate assets	(53,109)	(121,635)	(16,277)
Balance at end of year	4,310,302	4,278,433	3,073,364
Accumulated depreciation
Balance at beginning of year	668,104	538,412	426,752
Depreciation and amortization expense	161,056	153,425	119,168
Less: Non-real estate assets depreciation expense	(4,619)	(7,769)	(3,584)
Less: Sale of real estate assets depreciation expense	(6,768)	(15,964)	(3,924)
Balance at end of year	817,773	668,104	538,412
Total real estate, net	$ 3,492,529	$ 3,610,329	$ 2,534,952

Uncategorized Items - gcnl-2020

Label	Element	Value
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	$ 25,521,000