REAL ESTATE PROPERTIES - Summary of Real Estate Properties Owned (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at the beginning of the period				$ 635,836					$ 635,836
Depreciation	$ (6,526)	$ (6,499)	$ (6,466)	(6,435)	$ (6,389)	$ (6,544)	$ (7,543)	$ (8,008)	(25,926)	$ (28,484)
Balance at the end of the period	615,915				635,836				615,915	635,836
Total real estate properties
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at the beginning of the period				635,836					635,836
Improvements									6,152
Depreciation									(25,926)
Asset Sale									(147)
Balance at the end of the period	615,915				635,836				615,915	635,836
Multi-family
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at the beginning of the period				634,045					634,045
Improvements									6,005
Depreciation									(25,815)
Asset Sale									0
Balance at the end of the period	614,235				634,045				614,235	634,045
Retail shopping center - Yonkers, NY/Other | Yonkers, NY and other
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at the beginning of the period				$ 1,791					1,791
Improvements									147
Depreciation									(111)
Asset Sale									(147)
Balance at the end of the period	$ 1,680				$ 1,791				$ 1,680	$ 1,791