SEGMENT DISCLOSURE - Segment Net Operating Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 24,249	$ 17,334	$ 65,801	$ 59,379
Property and Lending expenses:
Interest expense	2,185	2,643	7,490	8,706
General and administrative	1,625	1,736	5,393	5,138
EXPENSES	21,679	22,682	65,005	70,737
Hotel
Segment Reporting Information [Line Items]
Revenues	5,478	1,762	10,833	11,129
Operating Segments
Property and Lending expenses:
Expense reimbursements to related parties—lending segment	55	901	1,219	2,581
Segment net operating income (loss)	13,259	6,642	34,976	25,208
Operating Segments | Office
Segment Reporting Information [Line Items]
Revenues	12,998	13,529	39,881	42,189
Property and Lending expenses:
Operating	5,362	6,026	16,704	17,338
General and administrative	123	61	291	397
EXPENSES	5,485	6,087	16,995	17,735
Segment net operating income (loss)	7,513	7,442	22,886	24,454
Operating Segments | Hotel
Segment Reporting Information [Line Items]
Revenues	5,478	1,762	10,833	11,129
Property and Lending expenses:
Operating	4,596	2,796	10,659	11,491
General and administrative	5	35	106	54
EXPENSES	4,601	2,831	10,765	11,545
Segment net operating income (loss)	877	(1,069)	68	(416)
Operating Segments | Lending
Segment Reporting Information [Line Items]
Revenues	5,773	1,981	15,086	5,963
Property and Lending expenses:
Interest expense	105	170	478	650
Expense reimbursements to related parties—lending segment	55	901	1,219	2,581
General and administrative	744	641	1,367	1,562
EXPENSES	904	1,712	3,064	4,793
Segment net operating income (loss)	$ 4,869	$ 269	$ 12,022	$ 1,170