SEGMENT INFORMATION (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($) segment
Additional Disclosure [Abstract]
Number of reportable segments | segment	3	2	2
Segment Reporting, Asset Reconciling Item [Abstract]
Real Estate Investment Property	$ 420,552	$ 437,232
Investment in marketable securities	26,987	36,825
Receivables	6,602	6,113
Deferred leasing costs	3,325	2,673
Prepaid and other assets	2,324	1,641
Total assets	1,625,489	491,615
Segment Reporting Information, Operating Income (Loss) [Abstract]
Property related income	41,374	33,569	$ 31,730
Investment income on marketable securities	1,112	693	646
Total revenues	42,486	34,262	32,376
Segment operating expenses	12,549	9,585	8,618
Net realized (loss) gain upon sale of marketable securities	(794)	3,179	(2,363)
Net unrealized change in fair value of investment in marketable securities	(9,953)	7,094	788
Change in net assets of consolidated CMBS Trust	529	0	0
Change in net assets of consolidated CMBS trust	529
Operating (loss) income	(5,507)	11,109	5,338
Reconciliation to net (loss) income
General and administrative expenses	(2,452)	(1,976)	(1,887)
Advisory expenses	(3,746)	(8,672)	(2,163)
Depreciation	(11,516)	(7,052)	(7,059)
Amortization	(7,830)	(6,174)	(5,774)
Operating (loss) income	(5,507)	11,109	5,338
Interest expense	(9,416)	(6,654)	(7,164)
Net (loss) income	(14,923)	4,455	(1,826)
Real Estate Loans
Segment Reporting Information, Operating Income (Loss) [Abstract]
Change in net assets of consolidated CMBS trust	529
Operating (loss) income	244	0	0
Reconciliation to net (loss) income
Operating (loss) income	244	0	0
Reportable segments
Segment Reporting, Asset Reconciling Item [Abstract]
Investments	1,603,802	474,057
Receivables	10,635	5,942
Deferred leasing costs	3,325	2,673
Prepaid and other assets	920	534
Total assets	1,618,682	483,206
Segment Reporting Information, Operating Income (Loss) [Abstract]
Operating (loss) income	19,719	34,950	22,183
Reconciliation to net (loss) income
Operating (loss) income	19,719	34,950	22,183
Reportable segments | Real Estate Properties
Segment Reporting, Asset Reconciling Item [Abstract]
Real Estate Investment Property	420,552	437,232
Receivables	6,185	5,830
Deferred leasing costs	3,325	2,673
Prepaid and other assets	920	534
Total assets	430,982	446,269
Segment Reporting Information, Operating Income (Loss) [Abstract]
Property related income	41,374	33,569	31,730
Investment income on marketable securities	0	0	0
Total revenues	41,374	33,569	31,730
Segment operating expenses	12,231	9,552	8,580
Net realized (loss) gain upon sale of marketable securities	0	0	0
Net unrealized change in fair value of investment in marketable securities	0	0	0
Change in net assets of consolidated CMBS Trust	0
Operating (loss) income	29,143	24,017	23,150
Reconciliation to net (loss) income
Operating (loss) income	29,143	24,017	23,150
Reportable segments | Real Estate Equity Securities
Segment Reporting, Asset Reconciling Item [Abstract]
Investment in marketable securities	26,987	36,825
Receivables	211	112
Total assets	27,198	36,937
Segment Reporting Information, Operating Income (Loss) [Abstract]
Property related income	0	0	0
Investment income on marketable securities	1,112	693	646
Total revenues	1,112	693	646
Segment operating expenses	33	33	38
Net realized (loss) gain upon sale of marketable securities	(794)	3,179	(2,363)
Net unrealized change in fair value of investment in marketable securities	(9,953)	7,094	788
Change in net assets of consolidated CMBS Trust	0
Operating (loss) income	(9,668)	10,933	(967)
Reconciliation to net (loss) income
Operating (loss) income	(9,668)	10,933	(967)
Reportable segments | Real Estate Loans
Segment Reporting, Asset Reconciling Item [Abstract]
Debt Securities	1,156,263	0
Receivables	4,239	0
Total assets	1,160,502	0
Segment Reporting Information, Operating Income (Loss) [Abstract]
Segment operating expenses	285
Other assets
Segment Reporting, Asset Reconciling Item [Abstract]
Total assets	6,807	8,409
Segment Reconciling Items
Reconciliation to net (loss) income
General and administrative expenses	$ (2,134)	$ (1,943)	$ (1,849)