REAL ESTATE (Schedule of Real Estate Investments) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 545,406,000	$ 547,310,000
Accumulated depreciation and amortization	(51,723,000)	(35,704,000)
Total real estate, net	493,683,000	511,606,000
Right-of-use asset	8,700,000
Land
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	102,288,000	104,138,000
Buildings and improvements
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	427,696,000	425,989,000
Tenant origination and absorption costs
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 15,422,000	17,183,000
Springmaid Beach Resort
Real Estate Properties [Line Items]
Date Acquired	Dec. 30, 2014
Total real estate, cost and net of impairment charges	$ 65,260,000
Accumulated depreciation and amortization	(10,314,000)
Total real estate, net	$ 54,946,000
Ownership %	90.00%
Springmaid Beach Resort | Land
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 27,438,000
Springmaid Beach Resort | Buildings and improvements
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	37,822,000
Springmaid Beach Resort | Tenant origination and absorption costs
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 0
Q and C Hotel
Real Estate Properties [Line Items]
Date Acquired	Dec. 17, 2015
Total real estate, cost and net of impairment charges	$ 54,465,000
Accumulated depreciation and amortization	(8,315,000)
Total real estate, net	$ 46,150,000
Ownership %	90.00%
Q and C Hotel | Land
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 1,232,000
Q and C Hotel | Buildings and improvements
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	53,233,000
Q and C Hotel | Tenant origination and absorption costs
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 0
Lincoln Court
Real Estate Properties [Line Items]
Date Acquired	May 20, 2016
Total real estate, cost and net of impairment charges	$ 52,810,000
Accumulated depreciation and amortization	(5,641,000)
Total real estate, net	$ 47,169,000
Ownership %	100.00%
Lincoln Court | Land
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 14,706,000
Lincoln Court | Buildings and improvements
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	35,978,000
Lincoln Court | Tenant origination and absorption costs
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 2,126,000
Lofts at NoHo Commons
Real Estate Properties [Line Items]
Date Acquired	Nov. 16, 2016
Total real estate, cost and net of impairment charges	$ 107,529,000
Accumulated depreciation and amortization	(6,576,000)
Total real estate, net	$ 100,953,000
Ownership %	90.00%
Lofts at NoHo Commons | Land
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 26,222,000
Lofts at NoHo Commons | Buildings and improvements
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	81,307,000
Lofts at NoHo Commons | Tenant origination and absorption costs
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 0
210 West 31st Street
Real Estate Properties [Line Items]
Date Acquired	Dec. 01, 2016
Total real estate, cost and net of impairment charges	$ 55,244,000
Accumulated depreciation and amortization	0
Total real estate, net	$ 55,244,000	$ 54,900,000
Ownership %	80.00%
Weighted average discount rate, percent	6.10%
Right-of-use asset	$ 6,800,000
Right-of-use asset, amortization	0
210 West 31st Street | Land
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	0
210 West 31st Street | Buildings and improvements
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	55,244,000
210 West 31st Street | Tenant origination and absorption costs
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 0
Oakland City Center
Real Estate Properties [Line Items]
Date Acquired	Aug. 18, 2017
Total real estate, cost and net of impairment charges	$ 174,748,000
Accumulated depreciation and amortization	(17,493,000)
Total real estate, net	$ 157,255,000
Ownership %	100.00%
Oakland City Center | Land
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 22,150,000
Oakland City Center | Buildings and improvements
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	142,102,000
Oakland City Center | Tenant origination and absorption costs
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 10,496,000
Grace Court
Real Estate Properties [Line Items]
Date Acquired	Oct. 03, 2017
Total real estate, cost and net of impairment charges	$ 35,350,000
Accumulated depreciation and amortization	(3,384,000)
Total real estate, net	$ 31,966,000
Ownership %	90.00%
Grace Court | Land
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 10,540,000
Grace Court | Buildings and improvements
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	22,010,000
Grace Court | Tenant origination and absorption costs
Real Estate Properties [Line Items]
Total real estate, cost and net of impairment charges	$ 2,800,000
Madison Square [Member]
Real Estate Properties [Line Items]
Weighted average discount rate, percent	5.40%
Weighted average remaining lease term	2 years 7 months 6 days
Operating lease, right-of-use asset	$ 1,900,000