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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
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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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