SEGMENT REPORTING - Operating Activity Within Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Segment profit	$ 31,003	$ 27,669	$ 87,661	$ 74,154
Total segments’ profit	71,108	65,176	204,019	180,555
Office
Segment Reporting Information [Line Items]
Property revenue	53,250	47,433	153,412	136,467
Property expense	(14,551)	(13,016)	(41,944)	(36,029)
Segment profit	38,699	34,417	111,468	100,438
Retail
Segment Reporting Information [Line Items]
Property revenue	25,694	24,541	74,873	69,296
Property expense	(7,807)	(5,745)	(22,965)	(19,922)
Segment profit	17,887	18,796	51,908	49,374
Multifamily
Segment Reporting Information [Line Items]
Property revenue	14,748	13,085	42,851	38,376
Property expense	(6,871)	(6,213)	(19,171)	(17,197)
Segment profit	7,877	6,872	23,680	21,179
Mixed-use
Segment Reporting Information [Line Items]
Property revenue	17,331	13,227	45,512	29,942
Property expense	(10,686)	(8,136)	(28,549)	(20,378)
Segment profit	$ 6,645	$ 5,091	$ 16,963	$ 9,564