Organization, Ownership and Basis of Presentation - Operating Properties (Details)	3 Months Ended
	Mar. 31, 2022 ft² project property tenant
In-process development projects - tenant improvement
Real Estate Properties [Line Items]
Rentable Square Feet	1,604,000
Number of properties | project	3
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	330,000
Number of properties | project	3
Stabilized Office Properties
Real Estate Properties [Line Items]
Number of Buildings | property	118
Rentable Square Feet	15,221,912
Number of Tenants | tenant	415
Percentage Occupied	91.30%
Percentage Leased	93.10%
Stabilized Residential Properties
Real Estate Properties [Line Items]
Number of properties | property	3
Number of Units | property	1,001
2022 Average Occupancy	93.70%