SEGMENT REPORTING - Operating Activity Within Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Segment profit	$ 28,342	$ 20,062
Total segments’ profit	65,896	54,386
Office
Segment Reporting Information [Line Items]
Property revenue	49,569	44,464
Property expense	(13,330)	(11,364)
Segment profit	36,239	33,100
Retail
Segment Reporting Information [Line Items]
Property revenue	24,841	21,774
Property expense	(7,728)	(7,442)
Segment profit	17,113	14,332
Multifamily
Segment Reporting Information [Line Items]
Property revenue	13,889	12,552
Property expense	(6,079)	(5,491)
Segment profit	7,810	7,061
Mixed-use
Segment Reporting Information [Line Items]
Property revenue	13,171	5,196
Property expense	(8,437)	(5,303)
Segment profit	$ 4,734	$ (107)