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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	Oct. 21, 2020 USD ($)	Apr. 02, 2015 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2004 ft²
Property Subject to or Available for Operating Lease [Line Items]
Real estate ventures aggregate indebtedness to third parties			$ 963,018	$ 596,007
Commerce Square | Preferred Equity Investment Obligation
Property Subject to or Available for Operating Lease [Line Items]
Required spending in capital improvements to property			$ 20,000
Prentiss Properties Trust | Commerce Square
Property Subject to or Available for Operating Lease [Line Items]
Non-controlling interest, ownership percentage by non-controlling Owners			1.00%
618 Market Street
Property Subject to or Available for Operating Lease [Line Items]
Contingent consideration, liability		$ 2,000
Fair value of contingent consideration		1,600
Interest expense		$ 2,000
Drexel Square
Property Subject to or Available for Operating Lease [Line Items]
Required spending in capital improvements to property			$ 7,700
Estimated potential additional contribution obligation			2,600
One Commerce Square
Property Subject to or Available for Operating Lease [Line Items]
Tax guarantee obligation			125,000
Two Commerce Square
Property Subject to or Available for Operating Lease [Line Items]
Tax guarantee obligation			100,000
Unconsolidated Real Estate Ventures
Property Subject to or Available for Operating Lease [Line Items]
Real estate ventures aggregate indebtedness to third parties			963,200
4040 Wilson Venture
Property Subject to or Available for Operating Lease [Line Items]
Real estate ventures aggregate indebtedness to third parties			141,857	$ 114,845
Secured construction loan with total borrowing capacity					$ 150,000
4040 Wilson Venture | 4040 Wilson Venture
Property Subject to or Available for Operating Lease [Line Items]
Secured construction loan with total borrowing capacity			150,000
Guarantees, maximum exposure amount			41,300
Two Logan Square
Property Subject to or Available for Operating Lease [Line Items]
Rentable square feet | ft²						708,844
Settlement liabilities			$ 900
Two Logan Square | Secured Debt
Property Subject to or Available for Operating Lease [Line Items]
Repayments of long-term debt	$ 79,800

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