Organization, Ownership and Basis of Presentation - Operating Properties (Details)	9 Months Ended
	Sep. 30, 2022 ft² project tenant property
Stabilized Office Properties
Real Estate Properties [Line Items]
Number of buildings | property	120
Rentable Square Feet	16,248,802
Number of Tenants | tenant	414
Percentage occupied	90.80%
Percentage Leased	92.60%
Stabilized Residential Properties
Real Estate Properties [Line Items]
Number of properties | property	3
Number of Units | property	1,001
2022 Average Occupancy	93.60%
In-process development projects - tenant improvement
Real Estate Properties [Line Items]
Rentable Square Feet	734,000
Number of properties | project	1
In-process development projects - under construction
Real Estate Properties [Line Items]
Rentable Square Feet	946,000
Number of properties | project	2
In-process redevelopment projects - under construction
Real Estate Properties [Line Items]
Rentable Square Feet	52,000
Number of properties | project	1