SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) Employee Room Segment Property	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
Number of employees | Employee	190
Office, retail, multifamily, and mixed-use operating properties | Property	28
Properties held for development | Property	3
Number of operating segments | Segment	4
Room in mixed-use segment all-suite hotel | Room	369
Allowance for Doubtful Accounts, Rent Receivables	$ 12.2	$ 10.0
Rent Concessions - COVID-19	$ 1.2
Rent Concessions - COVID-19 (Percentage)	2.00%
Deferred Rent Repayments - COVID-19	$ 0.7
Deferred Rent Repayments - COVID-19 (Percentage)	88.00%