SEGMENT REPORTING - Operating Activity Within Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Segment profit	$ 28,316	$ 26,423	$ 56,658	$ 46,485
Total segments’ profit	67,015	60,993	132,911	115,379
Office
Segment Reporting Information [Line Items]
Property revenue	50,593	44,570	100,162	89,034
Property expense	(14,063)	(11,648)	(27,393)	(23,012)
Segment profit	36,530	32,922	72,769	66,022
Retail
Segment Reporting Information [Line Items]
Property revenue	24,338	22,981	49,179	44,755
Property expense	(7,430)	(6,735)	(15,158)	(14,177)
Segment profit	16,908	16,246	34,021	30,578
Multifamily
Segment Reporting Information [Line Items]
Property revenue	14,214	12,739	28,103	25,291
Property expense	(6,221)	(5,493)	(12,300)	(10,984)
Segment profit	7,993	7,246	15,803	14,307
Mixed-use
Segment Reporting Information [Line Items]
Property revenue	15,010	11,519	28,181	16,715
Property expense	(9,426)	(6,940)	(17,863)	(12,243)
Segment profit	$ 5,584	$ 4,579	$ 10,318	$ 4,472