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REAL ESTATE INVESTMENTS - Narrative (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
ft²
Mar. 31, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
ft²
Sep. 30, 2022
USD ($)
Jan. 30, 2023
ft²
Real Estate Properties [Line Items]              
Net gain on disposition of real estate   $ 0   $ 8,669,000 $ 0 $ 8,813,000  
Leaseholds and Leasehold Improvements | 3151 Market Street              
Real Estate Properties [Line Items]              
Operating lease costs, capitalized     $ 7,800,000        
Rentable area (in square feet) | ft²             200,000
Net gain from remeasurment of investment in real estate ventures     $ 800,000        
Office Properties | Pennsylvania suburbs segment              
Real Estate Properties [Line Items]              
Impairment charge   $ 11,700,000          
Office Properties | Three Barton Skyway              
Real Estate Properties [Line Items]              
Rentable area (in square feet) | ft²   173,302     173,302    
Disposal group, including discontinued operation, consideration   $ 53,300,000     $ 53,300,000    
Impairment charge $ 4,500,000            
Net gain on disposition of real estate   $ 0