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Organization, Ownership and Basis of Presentation - Narrative (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
a
ft²
property
development_project
property_partnership
variableInterestEntity
development_site
building
Sep. 30, 2022
Dec. 31, 2022
USD ($)
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 occupancy duration 1 year    
Assets $ 11,471,121   $ 10,796,987
Liabilities 5,803,596   5,122,026
Noncontrolling interest in VIE $ 180,253   $ 184,390
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   2
Assets $ 423,900   $ 438,700
Liabilities 26,900   31,500
Variable Interest Entity, Primary Beneficiary | Real Estate Investment      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Assets $ 353,200   362,700
San Francisco, California      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | property 1    
101 First LLC and 303 Second LLC      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Company owned general partnership interest 56.00%    
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 interest in VIE $ 175,500   $ 179,400
Redwood LLC      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Company owned general partnership interest 93.00%    
Redwood LLC | Redwood City, California      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | property 2    
Operating Partnership      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Ownership interest (percent) 99.00% 99.00% 99.00%
Operating Partnership | Non-Affiliated Investors and Certain Executive Officer and Directors      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Ownership interest (percent) 1.00% 1.00% 1.00%
Development Project - Stabilized Office Property | San Diego, California      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | development_project 1    
Number of buildings | building 1    
Rentable square feet | ft² 70,616    
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 undeveloped land | a 64    
Stabilized Office Properties      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of buildings | building 120    
Rentable square feet | ft² 16,285,153    
Stabilized Office Properties | Washington      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | property 10    
Future Development Project | Washington      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | development_site 1    
Future Development Project | Texas      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | development_site 1    
Development Project In The Tenant Improvement Phase | Texas      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | 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 properties | 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    
Consolidated Property Partnerships Owning Office Properties Through REITs | 101 First LLC and 303 Second LLC      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of property partnerships | property_partnership 2