SEGMENT REPORTING - Operating Activity Within Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ 26,423	$ 22,995	$ 46,485	$ 51,843
Total segments’ profit	60,993	56,167	115,379	119,297
Office
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	44,570	43,880	89,034	88,389
Property Expenses	(11,648)	(11,601)	(23,012)	(23,394)
Operating Income (Loss)	32,922	32,279	66,022	64,995
Retail
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	22,981	21,492	44,755	47,318
Property Expenses	(6,735)	(4,907)	(14,177)	(12,238)
Operating Income (Loss)	16,246	16,585	30,578	35,080
Multifamily
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	12,739	12,463	25,291	25,288
Property Expenses	(5,493)	(5,313)	(10,984)	(10,823)
Operating Income (Loss)	7,246	7,150	14,307	14,465
Mixed-use
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	11,519	4,274	16,715	17,857
Property Expenses	(6,940)	(4,121)	(12,243)	(13,100)
Operating Income (Loss)	$ 4,579	$ 153	$ 4,472	$ 4,757