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Real Estate Properties - Unconsolidated Joint Ventures (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2023
Dec. 31, 2023
USD ($)
ft²
joint_venture
property
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
ft²
Oct. 31, 2023
USD ($)
Real Estate [Line Items]          
Number of joint ventures | joint_venture   2      
Number of properties (in properties) | property   152      
Rentable square feet (in square feet) | ft²       926,000  
Loss on impairment of equity method investment   $ 19,183 $ 0 $ 0  
Mortgage Note Payable          
Real Estate [Line Items]          
Interest rate (as a percent)   7.792%      
Principal balance   $ 177,320      
Unconsolidated Joint Ventures          
Real Estate [Line Items]          
Number of joint ventures | joint_venture   2      
Number of properties (in properties) | property   3      
OPI Carrying Value of Investments   $ 18,128 35,129    
Rentable square feet (in square feet) | ft²   468,000      
Equity method investment, difference between carrying amount and underlying equity   $ 701      
Unconsolidated Joint Ventures | Mortgage Note Payable          
Real Estate [Line Items]          
Interest rate (as a percent)   3.93%      
Principal balance   $ 82,000 82,000    
Unconsolidated Joint Ventures | Prosperity Metro Plaza          
Real Estate [Line Items]          
Number of properties (in properties) | property   2      
OPI Ownership   51.00%      
OPI Carrying Value of Investments   $ 18,128 19,237    
Rentable square feet (in square feet) | ft²   346,000      
Unconsolidated Joint Ventures | Prosperity Metro Plaza | Mortgage Note Payable          
Real Estate [Line Items]          
Interest rate (as a percent)   4.09%      
Principal balance   $ 50,000 50,000    
Unconsolidated Joint Ventures | 1750 H Street, NW          
Real Estate [Line Items]          
Number of properties (in properties) | property   1      
OPI Ownership   50.00%      
OPI Carrying Value of Investments   $ 0 15,892    
Rentable square feet (in square feet) | ft²   122,000      
Loss on impairment of equity method investment   $ 19,183      
Unconsolidated Joint Ventures | 1750 H Street, NW | Joint Venture Partner          
Real Estate [Line Items]          
Capital call funding requirement         $ 600
Unconsolidated Joint Ventures | 1750 H Street, NW | Mortgage Note Payable          
Real Estate [Line Items]          
Interest rate (as a percent)   3.69%      
Principal balance   $ 32,000 $ 32,000    
Debt instrument extension term 3 years