Organization, Ownership and Basis of Presentation - Operating Properties (Details)	3 Months Ended
	Mar. 31, 2023 ft² tenant project building property
Stabilized Office Properties
Real Estate Properties [Line Items]
Number of Buildings | building	119
Rentable Square Feet	16,206,299
Number of Tenants | tenant	403
Percentage Occupied	89.60%
Percentage Leased	91.60%
Stabilized Residential Properties
Real Estate Properties [Line Items]
Number of Projects | property	3
Number of Units | property	1,001
2023 Average Occupancy	93.40%
In-process development projects - tenant improvement
Real Estate Properties [Line Items]
Rentable Square Feet	734,000
Number of Projects | project	1
In-process development projects - under construction
Real Estate Properties [Line Items]
Rentable Square Feet	946,000
Number of Projects | project	2
In-process redevelopment projects - under construction
Real Estate Properties [Line Items]
Rentable Square Feet	100,000
Number of Projects | project	2