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Organization, Ownership and Basis of Presentation - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
a
property
property_partnership
developmentSite
VIE
building
Mar. 31, 2021
Dec. 31, 2021
USD ($)
VIE
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 $ 10,564,822   $ 10,583,397
Liabilities 4,899,061   4,893,527
Noncontrolling interest in VIE $ 186,961   $ 196,064
San Francisco, California      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | building 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%    
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%
Non-Affiliated Investors | Operating Partnership      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Ownership interest (percent) 1.00% 1.00% 1.00%
Variable Interest Entity, Primary Beneficiary      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of VIEs | VIE 3   2
Assets $ 483,500   $ 462,300
Liabilities 29,800   28,100
Variable Interest Entity, Primary Beneficiary | Real Estate Investment      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Assets 413,200   377,900
Variable Interest Entity, Primary Beneficiary | 101 First LLC and 303 Second LLC      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Noncontrolling interest in VIE $ 181,700   $ 190,700
Development sites      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of future development sites | developmentSite 7    
Area of undeveloped land | a 62    
Stabilized Office Properties | Washington      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | property 9    
Development Project In The Tenant Improvement Phase | Washington      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | developmentSite 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 | developmentSite 1    
Future Development Project | Washington      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | developmentSite 1    
Construction Development | Texas      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of properties | developmentSite 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