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Organization, Ownership and Basis of Presentation - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
a
property
development_site
variableInterestEntity
director
property_partnership
Dec. 31, 2023
USD ($)
director
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 $ 11,599,200 $ 11,401,045
Liabilities 5,956,469 5,741,352
Noncontrolling interest in VIE $ 176,637 $ 178,257
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 $ 415,200 $ 416,700
Liabilities 25,300 23,600
Variable Interest Entity, Primary Beneficiary | Real Estate Investment    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Assets $ 346,000 350,000
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 $ 172,300 $ 173,700
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%
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%
Number of directors | director 1 1
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 | Washington    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of properties | property 10  
Stabilized Office Properties | Texas    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of properties | property 1  
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  
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