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Basis of Presentation and Significant Accounting Policies - Narrative (Details)
 3 Months Ended 12 Months Ended
Sep. 30, 2024
variableInterestEntity
Dec. 31, 2024
USD ($)
property
variableInterestEntity
development_site
building
investment
Dec. 31, 2024
USD ($)
property
variableInterestEntity
development_site
building
investment
property_partnership
Dec. 31, 2024
USD ($)
property
variableInterestEntity
development_site
building
investment
Dec. 31, 2024
USD ($)
property
variableInterestEntity
reportableSegment
development_site
building
investment
Dec. 31, 2024
USD ($)
operatingSegment
property
variableInterestEntity
development_site
building
investment
Dec. 31, 2023
USD ($)
building
variableInterestEntity
property
investment
Dec. 31, 2022
USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Assets   $ 10,898,357,000 $ 10,898,357,000 $ 10,898,357,000 $ 10,898,357,000 $ 10,898,357,000 $ 11,401,045,000  
Liabilities   5,289,488,000 5,289,488,000 5,289,488,000 5,289,488,000 5,289,488,000 5,741,352,000  
Noncontrolling interest in consolidated subsidiary   $ 174,351,000 $ 174,351,000 $ 174,351,000 $ 174,351,000 $ 174,351,000 $ 178,257,000  
Number of equity method investments | investment   0 0 0 0 0 0  
Capitalized acquisition costs   $ 200,000 $ 200,000 $ 200,000 $ 200,000 $ 200,000 $ 0 $ 200,000
Number of properties classified as held for sale | property   0 0 0 0 0 0  
Number of consolidated property partnerships | property_partnership     3          
Conversion ratio       1        
Income tax provision   $ 0         $ 0 0
Number of operating segments         1 1    
Percentage of redevelopment projects       100.00%        
Lease Agreements | Minimum                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Finite-lived intangible asset, useful life   1 year 1 year 1 year 1 year 1 year    
Lease Agreements | Maximum                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Finite-lived intangible asset, useful life   20 years 20 years 20 years 20 years 20 years    
Disposal group, disposed of by sale                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Restricted cash   $ 0 $ 0 $ 0 $ 0 $ 0 $ 0  
Number of buildings | building   0 0 0 0 0 0  
Building and building improvements                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Depreciation of real estate   $ 308,000,000.0         $ 300,100,000 $ 287,800,000
Building and building improvements | Minimum                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Property depreciable lives   25 years 25 years 25 years 25 years 25 years    
Building and building improvements | Maximum                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Property depreciable lives   40 years 40 years 40 years 40 years 40 years    
Leasehold improvements | Minimum                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Property depreciable lives   1 year 1 year 1 year 1 year 1 year    
Leasehold improvements | Maximum                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Property depreciable lives   20 years 20 years 20 years 20 years 20 years    
Stabilized Office Properties | Washington                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Number of buildings | property   10 10 10 10 10    
Stabilized Office Properties | Texas                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Number of buildings | property   1 1 1 1 1    
Future development project | Washington                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Number of buildings | development_site   1 1 1 1 1    
Future development project | Texas                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Number of buildings | development_site   1 1 1 1 1    
Variable Interest Entity, Primary Beneficiary                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Number of VIEs | variableInterestEntity   3 3 3 3 3 2  
Number of VIEs established in the period | variableInterestEntity 1              
Assets   $ 435,500,000 $ 435,500,000 $ 435,500,000 $ 435,500,000 $ 435,500,000 $ 416,700,000  
Liabilities   18,000,000.0 18,000,000.0 18,000,000.0 18,000,000.0 18,000,000.0 23,600,000  
Variable Interest Entity, Primary Beneficiary | 100 First LLC and 303 Second LLC                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Noncontrolling interest in consolidated subsidiary   169,400,000 169,400,000 169,400,000 169,400,000 169,400,000 173,700,000  
Variable Interest Entity, Primary Beneficiary | Real estate investment                
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]                
Assets   $ 357,300,000 $ 357,300,000 $ 357,300,000 $ 357,300,000 $ 357,300,000 $ 350,000,000