COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2021 property	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jul. 23, 2021 USD ($)
Loss Contingencies [Line Items]
Limited payment guarantee, percent of principle balance (up to)				25.00%
One and Two Commerce Square | Preferred Equity Investment
Loss Contingencies [Line Items]
Other commitments		$ 20.0
Amount committed to date		4.7
Drexel Square
Loss Contingencies [Line Items]
Other commitments		7.0
Estimated potential additional contribution obligation		2.3
Winter Storm
Loss Contingencies [Line Items]
Number of properties damaged | property	1
Write-off of fixed assets			$ 1.2
Restoration liability		0.8	7.2
Business interruption costs			3.9
Insurance proceeds		2.4	15.3
Winter Storm | Other Income
Loss Contingencies [Line Items]
Insurance proceeds			3.0
Winter Storm | Accounts Payable and Accrued Liabilities
Loss Contingencies [Line Items]
Restoration liability			$ 1.9
3025 JFK Venture
Loss Contingencies [Line Items]
Construction loan amount				$ 186.7
Unconsolidated Real Estate Ventures
Loss Contingencies [Line Items]
Unconsolidated real estate venture debt at 100%, gross		$ 1,217.2