SEGMENT DISCLOSURE - Segment Net Operating Income (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) property	Jun. 30, 2019 USD ($) property	Jun. 30, 2020 USD ($) property	Jun. 30, 2019 USD ($) property
Segment Reporting Information [Line Items]
Number of types of commercial real estate properties | property	2	2	2	2
Revenues	$ 16,510	$ 36,856	$ 42,045	$ 84,133
Expenses:
Interest expense	2,896	2,550	6,063	6,595
General and administrative	1,668	1,621	3,402	3,409
EXPENSES	21,242	39,229	48,055	172,146
Hotel
Segment Reporting Information [Line Items]
Revenues	1,114	10,330	9,367	20,919
Reportable segments
Expenses:
Expense reimbursements to related parties	998	551	1,680	1,188
Segment net operating income (loss)	7,031	18,012	18,566	42,827
Reportable segments | Office
Segment Reporting Information [Line Items]
Revenues	13,763	22,050	28,660	55,495
Expenses:
Operating	5,266	8,913	11,312	22,472
General and administrative	238	202	336	356
EXPENSES	5,504	9,115	11,648	22,828
Segment net operating income (loss)	8,259	12,935	17,012	32,667
Reportable segments | Hotel
Segment Reporting Information [Line Items]
Revenues	1,114	10,330	9,367	20,919
Expenses:
Operating	2,226	6,745	8,695	13,439
General and administrative	6	63	19	77
EXPENSES	2,232	6,808	8,714	13,516
Segment net operating income (loss)	(1,118)	3,522	653	7,403
Reportable segments | Lending
Segment Reporting Information [Line Items]
Revenues	1,598	2,977	3,982	5,901
Expenses:
Interest expense	189	536	480	1,118
Expense reimbursements to related parties	998	551	1,680	1,188
General and administrative	521	335	921	838
EXPENSES	1,708	1,422	3,081	3,144
Segment net operating income (loss)	$ (110)	$ 1,555	$ 901	$ 2,757