REAL ESTATE - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Real Estate [Line Items]
Lease intangibles	$ 26,418	$ 29,085
Prepaid expenses and other assets	10,446	9,136
Total assets	3,007,190	3,017,927
Accounts payable and accrued expenses	(66,334)	(64,531)
Security deposits payable	(8,519)	(7,855)
Other liabilities and deferred credits	(82,864)	(86,215)
Total liabilities	1,807,222	$ 1,807,804
Office Building | Bel-Spring 520
Real Estate [Line Items]
Land	13,744
Building	27,793
Land improvements	713
Furniture, fixtures, and equipment	1,833
Total real estate	44,083
Lease intangibles	2,036
Prepaid expenses and other assets	10
Total assets	46,129
Accounts payable and accrued expenses	(14)
Security deposits payable	(189)
Other liabilities and deferred credits	(641)
Total liabilities	$ 844