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Organization, Ownership and Basis of Presentation - Operating Properties (Details)
 9 Months Ended
Sep. 30, 2023
ft²
tenant
development_project
property
building
Stabilized Office Properties  
Real Estate Properties [Line Items]  
Number of Buildings | building 120
Rentable Square Feet 16,285,153
Number of Tenants | tenant 401
Percentage Occupied 86.20%
Percentage Leased 87.50%
Stabilized Residential Properties  
Real Estate Properties [Line Items]  
Number of Projects | property 3
Number of Units | property 1,001
2023 Average Occupancy 92.90%
In-process development projects - tenant improvement  
Real Estate Properties [Line Items]  
Rentable Square Feet 734,000
Number of Projects | development_project 1
In-process development projects - under construction  
Real Estate Properties [Line Items]  
Rentable Square Feet 875,000
Number of Projects | development_project 1
In-process redevelopment projects - under construction  
Real Estate Properties [Line Items]  
Rentable Square Feet 100,000
Number of Projects | development_project 2