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RELATED PARTY TRANSACTIONS - Related-party Costs (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Payable as of	$ 1,034,000		$ 1,034,000		$ 649,000
Payment for administrative fees	0	$ 100,000	0	$ 200,000
Advisor and Dealer Manager
Related Party Transaction [Line Items]
Incurred	1,099,000	1,154,000
Payable as of	1,034,000		1,034,000		649,000
Acquisition fees on real estate equity securities \| Advisor and Dealer Manager
Related Party Transaction [Line Items]
Expenses	0	0	71,000	0
Payable as of	0		0		0
Acquisition fee on investment in unconsolidated entities \| Advisor and Dealer Manager
Related Party Transaction [Line Items]
Expenses	46,000	0	46,000	0
Payable as of	0		0		29,000
Advisor and Dealer Manager
Related Party Transaction [Line Items]
Incurred			2,285,000	2,305,000
Advisor and Dealer Manager \| Asset management fees
Related Party Transaction [Line Items]
Expenses	1,053,000	1,062,000	2,096,000	2,111,000
Payable as of	1,034,000		1,034,000		620,000
Advisor and Dealer Manager \| Reimbursable operating expenses
Related Party Transaction [Line Items]
Expenses	0	$ 92,000	72,000	$ 194,000
Payable as of	$ 0		$ 0		$ 0