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RELATED-PARTY TRANSACTIONS (Details) ft² in Thousands			3 Months Ended		6 Months Ended
RELATED-PARTY TRANSACTIONS (Details) ft² in Thousands	Jan. 01, 2019 sudsidiary	May 10, 2018	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Aug. 07, 2019 ft²	May 15, 2019 ft²	Dec. 31, 2018 USD ($)	Oct. 01, 2015	Mar. 11, 2014 USD ($)
Related-party transactions
Due to related parties			$ 6,775,000		$ 6,775,000				$ 10,951,000
Wholesaling agreement, percent of selling price fee per share		2.75%
Stock issuance costs					$ 336,000	$ 857,000
CIM Urban REIT Management, L.P. \| 0 - 500,000,000
Related-party transactions
Quarterly fee percentage			0.25%		0.25%
CIM Urban REIT Management, L.P. \| 0 - 500,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments			$ 0		$ 0
CIM Urban REIT Management, L.P. \| 0 - 500,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments			$ 500,000,000		$ 500,000,000
CIM Urban REIT Management, L.P. \| 500,000,000 - 1,000,000,000
Related-party transactions
Quarterly fee percentage			0.2375%		0.2375%
CIM Urban REIT Management, L.P. \| 500,000,000 - 1,000,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments			$ 500,000,000		$ 500,000,000
CIM Urban REIT Management, L.P. \| 500,000,000 - 1,000,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments			$ 1,000,000,000		$ 1,000,000,000
CIM Urban REIT Management, L.P. \| 1,000,000,000 - 1,500,000,000
Related-party transactions
Quarterly fee percentage			0.225%		0.225%
CIM Urban REIT Management, L.P. \| 1,000,000,000 - 1,500,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments			$ 1,000,000,000		$ 1,000,000,000
CIM Urban REIT Management, L.P. \| 1,000,000,000 - 1,500,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments			$ 1,500,000,000		$ 1,500,000,000
CIM Urban REIT Management, L.P. \| 1,500,000,000 - 4,000,000,000
Related-party transactions
Quarterly fee percentage			0.2125%		0.2125%
CIM Urban REIT Management, L.P. \| 1,500,000,000 - 4,000,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments			$ 1,500,000,000		$ 1,500,000,000
CIM Urban REIT Management, L.P. \| 1,500,000,000 - 4,000,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments			$ 4,000,000,000		$ 4,000,000,000
CIM Urban REIT Management, L.P. \| 4,000,000,000 - 20,000,000,000
Related-party transactions
Quarterly fee percentage			0.10%		0.10%
CIM Urban REIT Management, L.P. \| 4,000,000,000 - 20,000,000,000 \| Minimum
Related-party transactions
Daily average adjusted fair value of investments			$ 4,000,000,000		$ 4,000,000,000
CIM Urban REIT Management, L.P. \| 4,000,000,000 - 20,000,000,000 \| Maximum
Related-party transactions
Daily average adjusted fair value of investments			20,000,000,000		20,000,000,000
CIM Urban REIT Management, L.P. \| Asset Management Fees
Related-party transactions
Fees			2,919,000	$ 4,460,000	7,245,000	8,875,000
Due to related parties			2,929,000		2,929,000				4,540,000
CIM Urban REIT Management, L.P. \| Property Management Fees
Related-party transactions
Fees			607,000	1,083,000	1,612,000	2,205,000
CIM Management Entities
Related-party transactions
Due to related parties			2,577,000		2,577,000				3,202,000
CIM Management Entities \| Lease Commission Fees
Related-party transactions
Fees			556,000	30,000	578,000	219,000
CIM Management Entities \| Personnel Fees
Related-party transactions
Fees			1,406,000	1,533,000	3,036,000	3,267,000
CIM Management Entities \| Construction Management Fees
Related-party transactions
Fees			69,000	86,000	169,000	441,000
CIM Management Entities And Related Parties
Related-party transactions
Due from related parties			20,000		20,000				315,000
CIM Service Provider, LLC \| Base Service Fee
Related-party transactions
Fees			276,000	269,000	552,000	539,000
Fees payable per year under agreement											$ 1,000,000
CIM Service Provider, LLC \| Master Services Agreement
Related-party transactions
Due to related parties			1,022,000		1,022,000				1,490,000
Compensation expensed for performing other services			488,000	697,000	1,058,000	1,555,000
CIM SBA Staffing, LLC \| Personnel Fees
Related-party transactions
Due to related parties			612,000		612,000				1,347,000
Deferred personnel costs			44,000	88,000	50,000	136,000
CIM SBA Staffing, LLC \| Expenses Related to Lending Segment Subject to Reimbursement
Related-party transactions
Fees			551,000	639,000	1,188,000	1,240,000
CIM SBA Staffing, LLC \| Expenses Related to Corporate Services Subject to Reimbursement
Related-party transactions
Fees			54,000	78,000	131,000	145,000
CIM Management Entities Affiliate
Related-party transactions
Lease renewal term										5 years
Rental and other property income			28,000	$ 27,000	55,000	$ 54,000
CIM Group \| Eleven Year Lease
Related-party transactions
Rental and other property income			206,000		206,000
Lease, term of contract								11 years
Net rentable area (in sq ft) \| ft²								32
CIM Capital, LLC
Related-party transactions
Number of subsidiaries \| sudsidiary	4
CCO Capital, LLC \| Wholesaling Agreement
Related-party transactions
Due to related parties			133,000		133,000				138,000
Deferred costs			386,000		386,000				$ 200,000
Stock issuance costs			$ 102,000		$ 102,000
Subsequent Event \| CIM Group \| Eleven Year Lease
Related-party transactions
Net rentable area (in sq ft) \| ft²							30