Organization and Basis of Presentation - Schedule of Commercial Office Properties (Details)	Mar. 31, 2022 ft² building
Real estate properties
Number of Buildings | building	58
Approximate Square Feet unaudited (sqft)	27,549,252
Weighted Average Occupancy unaudited (as a percent)	91.00%
Commercial properties
Real estate properties
Number of Buildings | building	50
Approximate Square Feet unaudited (sqft)	26,880,686
Weighted Average Occupancy unaudited (as a percent)	91.00%
Consolidated properties
Real estate properties
Number of Buildings | building	30
Approximate Square Feet unaudited (sqft)	11,521,631
Consolidated properties | Commercial properties
Real estate properties
Number of Buildings | building	28
Approximate Square Feet unaudited (sqft)	11,298,999
Unconsolidated properties
Real estate properties
Number of Buildings | building	28
Approximate Square Feet unaudited (sqft)	16,027,621
Unconsolidated properties | Commercial properties
Real estate properties
Number of Buildings | building	22
Approximate Square Feet unaudited (sqft)	15,581,687
Manhattan
Real estate properties
Number of Buildings | building	43
Approximate Square Feet unaudited (sqft)	26,017,886
Weighted Average Occupancy unaudited (as a percent)	91.50%
Manhattan | Office
Real estate properties
Number of Buildings | building	23
Approximate Square Feet unaudited (sqft)	21,841,726
Weighted Average Occupancy unaudited (as a percent)	91.50%
Manhattan | Retail
Real estate properties
Number of Buildings | building	11
Approximate Square Feet unaudited (sqft)	319,884
Weighted Average Occupancy unaudited (as a percent)	91.20%
Manhattan | Development/Redevelopment
Real estate properties
Number of Buildings | building	8
Approximate Square Feet unaudited (sqft)	3,848,592
Manhattan | Fee Interest
Real estate properties
Number of Buildings | building	1
Approximate Square Feet unaudited (sqft)	7,684
Manhattan | Residential
Real estate properties
Number of Buildings | building	8
Approximate Square Feet unaudited (sqft)	668,566
Weighted Average Occupancy unaudited (as a percent)	87.90%
Manhattan | Consolidated properties
Real estate properties
Number of Buildings | building	21
Approximate Square Feet unaudited (sqft)	10,436,199
Manhattan | Consolidated properties | Office
Real estate properties
Number of Buildings | building	12
Approximate Square Feet unaudited (sqft)	8,180,345
Manhattan | Consolidated properties | Retail
Real estate properties
Number of Buildings | building	2
Approximate Square Feet unaudited (sqft)	17,888
Manhattan | Consolidated properties | Retail | 7 Dey / 185 Broadway
Real estate properties
Approximate Square Feet unaudited (sqft)	50,206
Manhattan | Consolidated properties | Development/Redevelopment
Real estate properties
Number of Buildings | building	6
Approximate Square Feet unaudited (sqft)	2,230,282
Manhattan | Consolidated properties | Fee Interest
Real estate properties
Number of Buildings | building	1
Approximate Square Feet unaudited (sqft)	7,684
Manhattan | Consolidated properties | Residential
Real estate properties
Number of Buildings | building	2
Approximate Square Feet unaudited (sqft)	222,632
Manhattan | Consolidated properties | Residential | 7 Dey / 185 Broadway
Real estate properties
Approximate Square Feet unaudited (sqft)	140,382
Manhattan | Unconsolidated properties
Real estate properties
Number of Buildings | building	22
Approximate Square Feet unaudited (sqft)	15,581,687
Manhattan | Unconsolidated properties | Office
Real estate properties
Number of Buildings | building	11
Approximate Square Feet unaudited (sqft)	13,661,381
Manhattan | Unconsolidated properties | Retail
Real estate properties
Number of Buildings | building	9
Approximate Square Feet unaudited (sqft)	301,996
Manhattan | Unconsolidated properties | Development/Redevelopment
Real estate properties
Number of Buildings | building	2
Approximate Square Feet unaudited (sqft)	1,618,310
Manhattan | Unconsolidated properties | Fee Interest
Real estate properties
Number of Buildings | building	0
Approximate Square Feet unaudited (sqft)	0
Manhattan | Unconsolidated properties | Residential
Real estate properties
Number of Buildings | building	6
Approximate Square Feet unaudited (sqft)	445,934
Suburban | Office
Real estate properties
Number of Buildings | building	7
Approximate Square Feet unaudited (sqft)	862,800
Weighted Average Occupancy unaudited (as a percent)	78.60%
Suburban | Consolidated properties | Office
Real estate properties
Number of Buildings | building	7
Approximate Square Feet unaudited (sqft)	862,800
Suburban | Unconsolidated properties | Office
Real estate properties
Number of Buildings | building	0
Approximate Square Feet unaudited (sqft)	0