SEGMENT DISCLOSURE - Segment Net Operating Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) property	Mar. 31, 2020 USD ($) property
Segment Reporting Information [Line Items]
Number of types of commercial real estate properties (in properties) | property	2	2
Revenues	$ 18,879	$ 25,535
Property and Lending expenses:
Interest expense	2,632	3,167
General and administrative	2,622	1,734
EXPENSES	22,176	26,813
Hotel
Segment Reporting Information [Line Items]
Revenues	1,878	8,253
Operating Segments
Property and Lending expenses:
Expense reimbursements to related parties—lending segment	731	682
Segment net operating income (loss)	9,086	11,535
Operating Segments | Office
Segment Reporting Information [Line Items]
Revenues	13,527	14,897
Property and Lending expenses:
Operating	5,655	6,046
General and administrative	85	98
EXPENSES	5,740	6,144
Segment net operating income (loss)	7,787	8,753
Operating Segments | Hotel
Segment Reporting Information [Line Items]
Revenues	1,878	8,253
Property and Lending expenses:
Operating	2,635	6,469
General and administrative	50	13
EXPENSES	2,685	6,482
Segment net operating income (loss)	(807)	1,771
Operating Segments | Lending
Segment Reporting Information [Line Items]
Revenues	3,474	2,384
Property and Lending expenses:
Interest expense	191	291
Expense reimbursements to related parties—lending segment	731	682
General and administrative	446	400
EXPENSES	1,368	1,373
Segment net operating income (loss)	$ 2,106	$ 1,011