BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Fixed lease payments	$ 12,567,000	$ 20,640,000	$ 25,912,000	$ 51,536,000
Variable lease payments	1,133,000	1,779,000	2,607,000	4,464,000
Rental and other property income	13,700,000	22,419,000	28,519,000	56,000,000
Hotel income	869,000	9,549,000	8,628,000	19,353,000
Rental and other property income	13,700,000	22,419,000	28,519,000	56,000,000
Interest and other income	1,941,000	4,888,000	4,898,000	8,780,000
REVENUES	16,510,000	36,856,000	42,045,000	84,133,000
Tenant recoveries outside of lease agreements	0	0	0	205,000
Remaining performance obligations	0		0
Hotel
Disaggregation of Revenue [Line Items]
Hotel income	869,000	9,549,000	8,628,000	19,353,000
Rental and other property income	227,000	736,000	689,000	1,472,000
Interest and other income	18,000	45,000	50,000	94,000
REVENUES	$ 1,114,000	$ 10,330,000	$ 9,367,000	$ 20,919,000