COMPONENTS OF RENTAL INCOME AND EXPENSE - Component of Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Rental Income [Line Items]
Percentage rent	$ 969	$ 1,353	$ 2,593	$ 1,677
Hotel revenue	8,164	4,680	17,626	13,948
Total rental income	93,804	80,759	262,573	252,059
Recognition of straight-line rents	3,800	4,200	10,800	14,000
Recognition of amortization of above and below market leases	800	900	2,400	2,800
Other	591	527	1,724	1,628
Office
Rental Income [Line Items]
Lease rental income	45,855	43,193	132,229	127,890
Retail
Rental Income [Line Items]
Lease rental income	23,438	18,334	65,866	64,198
Multifamily
Rental Income [Line Items]
Lease rental income	12,169	11,770	35,684	35,380
Mixed-use
Rental Income [Line Items]
Lease rental income	$ 2,618	$ 902	$ 6,851	$ 7,338