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Organization, Ownership, and Basis of Presentation - Additional Information (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
a
property
development_site
property_partnership
variableInterestEntity
Dec. 31, 2024
USD ($)
entity
variableInterestEntity
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Lease-up properties occupancy percentage 95.00%  
Lease-up properties, period from the date of cessation of major base building construction activities 1 year  
Assets $ 10,992,199 $ 10,898,357
Liabilities 5,306,344 5,289,488
Noncontrolling interests in consolidated property partnerships $ 167,339 $ 174,351
Entity established to facilitate potential Section 1031 Exchange | entity   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 2 3
Assets $ 390,200 $ 435,500
Liabilities 22,100 18,000
Variable Interest Entity, Primary Beneficiary | Real Estate Investment    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Assets $ 322,600 $ 357,300
Operating Partnership    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Ownership interest (percent) 99.00% 99.00%
Operating Partnership | Non-Affiliated Investors and Former Executive Officer and Director    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Ownership interest (percent) 1.00% 1.00%
101 First LLC and 303 Second LLC | Variable Interest Entity, Primary Beneficiary    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Noncontrolling interests in consolidated property partnerships $ 162,500 $ 169,400
Future Development Site    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of future development sites | development_site 8  
Area of Land | a 64  
Stabilized Office Properties | Washington    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of Projects | property 10  
Stabilized Office Properties | Texas    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of Projects | property 1  
Future Development Project | Washington    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of Projects | development_site 1  
Future Development Project | Texas    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of Projects | development_site 1  
Properties And Development Projects    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Property ownership percentage 100.00%  
Office Properties Owned By Consolidated Property Partnerships    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of Projects | property 4  
Consolidated Property Partnerships    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of property partnerships | property_partnership 3