SEGMENT REPORTING - Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Capital expenditures	$ 32,128	$ 12,216
Office
Segment Reporting Information [Line Items]
Capital expenditures	26,666	9,527
Retail
Segment Reporting Information [Line Items]
Capital expenditures	3,560	1,722
Multifamily
Segment Reporting Information [Line Items]
Capital expenditures	1,571	963
Mixed-use
Segment Reporting Information [Line Items]
Capital expenditures	$ 331	$ 4