REAL ESTATE PROPERTIES - Summary of Activity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Real Estate Properties
Balance at the beginning of the period				$ 160,192					$ 160,192
Depreciation and amortization	$ (3,285)	$ (1,787)	$ (1,416)	(1,537)	$ (1,595)	$ (1,777)	$ (1,809)	$ (1,561)	(8,025)	$ (6,742)
Balance at the end of the period	293,550				160,192				293,550	160,192
Multi-family
Real Estate Properties
Balance at the beginning of the period				153,604					153,604
Property Acquisitions									160,583
Improvements									1,308
Depreciation and amortization									(7,116)
Asset Sale									(16,841)
Held for Sale									0
Balance at the end of the period	291,538				153,604				291,538	153,604
Land - Daytona, FL | Daytona, FL
Real Estate Properties
Balance at the beginning of the period				4,379					4,379
Property Acquisitions									0
Improvements									0
Depreciation and amortization									0
Asset Sale									0
Held for Sale									(4,379)
Balance at the end of the period	0				4,379				0	4,379
Retail shopping center - Yonkers, NY/Other | Yonkers, NY and other | Newark Joint Venture
Real Estate Properties
Balance at the beginning of the period				2,209					2,209
Property Acquisitions									0
Improvements									0
Depreciation and amortization									(111)
Asset Sale									(86)
Held for Sale									0
Balance at the end of the period	2,012				2,209				2,012	2,209
Total Real Estate
Real Estate Properties
Balance at the beginning of the period				$ 160,192					160,192
Property Acquisitions									160,583
Improvements									1,308
Depreciation and amortization									(7,227)
Asset Sale									(16,927)
Held for Sale									(4,379)
Balance at the end of the period	$ 293,550				$ 160,192				$ 293,550	$ 160,192