OTHER LIABILITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Liabilities, Unclassified [Abstract]
Security deposits	$ 27,277	$ 22,140
Prepaid rent and other deferred income	15,529	14,694
Operating lease liabilities - ground leases	23,250	11,199
Operating lease liabilities - office leases	2,157	2,167
Acquired Below Market Lease Intangibles	10,368	9,019
Accumulated Amortization of Acquired Below Market Lease Intangibles	(6,964)	(6,168)
Acquired Below Market Lease Intangibles, Net of Accumulated Amortization	3,404	2,851
Interest rate swap liabilities	2,987	10,752
Prepaid tenant improvement reimbursements	556	364
Other liabilities	3,516	5,650
Total Other Liabilities	$ 78,676	$ 69,817