LEASES - Narrative (Details)	12 Months Ended
	Dec. 31, 2020 state lease
Lessor, Lease, Description [Line Items]
Operating leases rental period terms	12 months
Number of States | state	5
Minimum
Lessor, Lease, Description [Line Items]
Term of office and retail leases	3 years
Term of apartment leases	7 months
Lease extension option period	3 years
Lease extension options exercise period	6 months
Maximum
Lessor, Lease, Description [Line Items]
Term of office and retail leases	10 years
Term of apartment leases	15 months
Lease extension option period	10 years
Lease extension options exercise period	12 months
The Land Mark at One Market
Lessor, Lease, Description [Line Items]
Lease extension option exercise period	5 years
Retail Or Office
Lessor, Lease, Description [Line Items]
Number of leases	816
Residential Property
Lessor, Lease, Description [Line Items]
Number of leases	1,722