Segment Information - Summary of Certain Balance Sheet Data by Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Segment Reporting Information
Real estate, at cost	$ 5,529,625	$ 6,236,476
Investments in unconsolidated real estate ventures	461,444	462,885
Total assets (1)	6,315,880	6,386,206
Operating Segments | Commercial Segment
Segment Reporting Information
Real estate, at cost	2,674,939	3,422,278
Investments in unconsolidated real estate ventures	280,913	281,515
Total assets (1)	3,594,436	3,591,839
Operating Segments | Multifamily Segment
Segment Reporting Information
Real estate, at cost	2,434,441	2,367,712
Investments in unconsolidated real estate ventures	111,920	103,389
Total assets (1)	1,836,526	1,797,807
Other
Segment Reporting Information
Real estate, at cost	420,245	446,486
Investments in unconsolidated real estate ventures	68,611	77,981
Total assets (1)	$ 884,918	$ 996,560