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RELATED PARTY TRANSACTIONS (Details) $ / shares in Units, ft² in Thousands					1 Months Ended	12 Months Ended
	Jan. 01, 2019 sudsidiary	May 10, 2018	Dec. 18, 2017 USD ($) $ / shares shares	Jun. 12, 2017 USD ($) $ / shares shares	Oct. 31, 2019 $ / shares shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 12, 2020	Aug. 07, 2019 ft²	May 15, 2019 ft²	Oct. 01, 2015	Mar. 11, 2014 USD ($)
Related-party transactions
Due to related parties						$ 9,431,000	$ 10,951,000
Wholesaling agreement, percent of selling price fee per share		2.75%
Payment of deferred preferred stock offering costs						1,320,000	1,136,000	$ 3,832,000
Aggregate purchase price, repurchase of common stock								886,010,000
C I M Urban REIT Management L P \| Asset management fees
Related-party transactions
Fees						12,019,000	17,880,000	22,229,000
Due to related parties						2,356,000	4,540,000
C I M Urban REIT Management L P \| Property management fees
Related-party transactions
Fees						$ 2,562,000	4,365,000	5,034,000
C I M Urban REIT Management L P \| 0 - 500,000
Related-party transactions
Quarterly fee percentage						0.25%
C I M Urban REIT Management L P \| 0 - 500,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments						$ 0
C I M Urban REIT Management L P \| 0 - 500,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments						$ 500,000,000
C I M Urban REIT Management L P \| 500,000 - 1,000,000
Related-party transactions
Quarterly fee percentage						0.2375%
C I M Urban REIT Management L P \| 500,000 - 1,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments						$ 500,000,000
C I M Urban REIT Management L P \| 500,000 - 1,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments						$ 1,000,000,000
C I M Urban REIT Management L P \| 1,000,000 - 1,500,000
Related-party transactions
Quarterly fee percentage						0.225%
C I M Urban REIT Management L P \| 1,000,000 - 1,500,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments						$ 1,000,000,000
C I M Urban REIT Management L P \| 1,000,000 - 1,500,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments						$ 1,500,000,000
C I M Urban REIT Management L P \| 1,500,000 - 4,000,000
Related-party transactions
Quarterly fee percentage						0.2125%
C I M Urban REIT Management L P \| 1,500,000 - 4,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments						$ 1,500,000,000
C I M Urban REIT Management L P \| 1,500,000 - 4,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments						$ 4,000,000,000
C I M Urban REIT Management L P \| 4,000,000 - 20,000,000
Related-party transactions
Quarterly fee percentage						0.10%
C I M Urban REIT Management L P \| 4,000,000 - 20,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments						$ 4,000,000,000
C I M Urban REIT Management L P \| 4,000,000 - 20,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments						20,000,000,000
C I M Management Entities
Related-party transactions
Due to related parties						4,107,000	3,202,000
C I M Management Entities \| Personnel
Related-party transactions
Fees						5,852,000	6,065,000	8,465,000
C I M Management Entities \| Lease commission fees
Related-party transactions
Fees						658,000	1,548,000	982,000
C I M Management Entities \| Construction management fees
Related-party transactions
Fees						525,000	580,000	1,654,000
C I M Management Entities and Related Parties
Related-party transactions
Due from related parties						97,000	315,000
C I M Service Provider LLC \| Master services agreement
Related-party transactions
Due to related parties						1,673,000	1,490,000
Fees payable per year under agreement													$ 1,000,000
Compensation expensed for performing other services						2,577,000	2,783,000	3,065,000
C I M Service Provider LLC \| Base service fee
Related-party transactions
Fees						1,102,000	1,079,000	1,060,000
C I M SBA Staffing LLC \| Personnel
Related-party transactions
Due to related parties						1,029,000	1,347,000
Fees for services deferred						112,000	330,000	429,000
C I M SBA Staffing LLC \| Expenses related to lending segment subject to reimbursement
Related-party transactions
Fees						2,382,000	2,445,000	3,464,000
C I M SBA Staffing LLC \| Expenses related to corporate services subject to reimbursement
Related-party transactions
Fees						223,000	264,000	433,000
C I M Management Entities Affiiate
Related-party transactions
Lease renewal term												5 years
Revenue from related parties						112,000	108,000	108,000
CIM Group \| Eleven year lease
Related-party transactions
Revenue from related parties						932,000	0	$ 0
Operating lease term											11 years
Square Feet \| ft²										30	32
Administrator
Related-party transactions
Shares acquired (in shares) \| shares					2,468,390
Percent of common stock outstanding					16.90%
Per share amount (in usd per share) \| $ / shares					$ 19.1685
CCO Capital, LLC \| Wholesaling agreement
Related-party transactions
Due to related parties						169,000	138,000
Deferred costs						621,000	$ 200,000
Payment of deferred preferred stock offering costs						$ 700,000
June 2017 Share Repurchase \| Urban Partners II, LLC \| Common Stock
Related-party transactions
Repurchase of common stock (in shares) \| shares				8,727,272
Aggregate purchase price, repurchase of common stock				$ 576,000,000
Share price of stock repurchased (in usd per share) \| $ / shares				$ 66
December 2017 Share Repurchase \| Urban Partners II, LLC \| Common Stock
Related-party transactions
Repurchase of common stock (in shares) \| shares			4,696,969
Aggregate purchase price, repurchase of common stock			$ 310,000,000
Share price of stock repurchased (in usd per share) \| $ / shares			$ 66
CIM Capital, LLC
Related-party transactions
Number of subsidiaries \| sudsidiary	4
Subsequent event \| CIM Group and CIM Commercial Trust Corporation Officers And Directors
Related-party transactions
Percent of common stock outstanding									19.60%