Segment Information - Summary of Certain Balance Sheet Data by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information
Real estate, at cost	$ 6,236,476	$ 6,000,631
Investments in unconsolidated real estate ventures	462,885	461,369
Total assets (1)	6,386,206	6,079,547
Operating Segments | Commercial Segment
Segment Reporting Information
Real estate, at cost	3,477,260	3,459,171
Investments in unconsolidated real estate ventures	281,515	327,798
Total assets (1)	3,739,902	3,430,509
Operating Segments | Multifamily Segment
Segment Reporting Information
Real estate, at cost	2,367,712	2,036,131
Investments in unconsolidated real estate ventures	103,389	108,593
Total assets (1)	1,797,807	1,787,718
Other
Segment Reporting Information
Real estate, at cost	391,504	505,329
Investments in unconsolidated real estate ventures	77,981	24,978
Total assets (1)	$ 848,497	$ 861,320