SEGMENT REPORTING - Capital Expenditures (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Capital expenditures	[1]	$ 23,925	$ 22,437
Retail
Segment Reporting Information [Line Items]
Capital expenditures	[1]	3,558	4,791
Office
Segment Reporting Information [Line Items]
Capital expenditures	[1]	18,200	16,483
Multifamily
Segment Reporting Information [Line Items]
Capital expenditures	[1]	1,284	771
Mixed-use
Segment Reporting Information [Line Items]
Capital expenditures	[1]	$ 883	$ 392

[1] Capital expenditures represent cash paid for capital expenditures during the period and include leasing commissions paid