SEGMENT DISCLOSURE - Segment Net Operating Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 22,673	$ 16,510	$ 41,552	$ 42,045
Property and Lending expenses:
Interest expense	2,673	2,896	5,305	6,063
General and administrative	1,146	1,668	3,768	3,402
EXPENSES	21,150	21,242	43,326	48,055
Hotel
Segment Reporting Information [Line Items]
Revenues	3,477	1,114	5,355	9,367
Operating Segments
Property and Lending expenses:
Expense reimbursements to related parties—lending segment	433	998	1,164	1,680
Segment net operating income (loss)	12,631	7,031	21,717	18,566
Operating Segments | Office
Segment Reporting Information [Line Items]
Revenues	13,356	13,763	26,883	28,660
Property and Lending expenses:
Operating	5,687	5,266	11,342	11,312
General and administrative	83	238	168	336
EXPENSES	5,770	5,504	11,510	11,648
Segment net operating income (loss)	7,586	8,259	15,373	17,012
Operating Segments | Hotel
Segment Reporting Information [Line Items]
Revenues	3,477	1,114	5,355	9,367
Property and Lending expenses:
Operating	3,428	2,226	6,063	8,695
General and administrative	51	6	101	19
EXPENSES	3,479	2,232	6,164	8,714
Segment net operating income (loss)	(2)	(1,118)	(809)	653
Operating Segments | Lending
Segment Reporting Information [Line Items]
Revenues	5,839	1,598	9,313	3,982
Property and Lending expenses:
Interest expense	182	189	373	480
Expense reimbursements to related parties—lending segment	433	998	1,164	1,680
General and administrative	177	521	623	921
EXPENSES	792	1,708	2,160	3,081
Segment net operating income (loss)	$ 5,047	$ (110)	$ 7,153	$ 901