Investments in Unconsolidated Joint Ventures - Schedule of General Information on Joint Ventures (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) ft²	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) ft²	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2021
General information on each joint venture
Equity in net (loss) gain on sale of interest in unconsolidated joint venture/real estate | $	$ (1,946)	$ (8,129)	$ (1,946)	$ 18,635
Debt and preferred equity investments | $	315,684		315,684		$ 303,726
Preferred Equity
General information on each joint venture
Debt and preferred equity investments | $	$ 138,954		$ 138,954
450 Park Avenue | Preferred Equity
General information on each joint venture
Joint venture sold (as a percent)	0.50		0.50
625 Madison Avenue | Preferred Equity
General information on each joint venture
Carrying value of investment in leasehold interest | $	$ 235,400		$ 235,400
Equity in net (loss) gain on sale of interest in unconsolidated joint venture/real estate | $			14,500
Debt and preferred equity investments | $	$ 209,700		$ 209,700
Average yield (as a percent)			8.76%
Private Investors | Due from joint venture | 800 Third Avenue
General information on each joint venture
Economic interest (as a percent)	60.52%		60.52%
Approximate square feet unaudited (sqft)	526,000		526,000
Private Investors | Due from joint venture | 115 Spring Street
General information on each joint venture
Economic interest (as a percent)	51.00%		51.00%
Approximate square feet unaudited (sqft)	5,218		5,218
Private Investors | Due from joint venture | 625 Madison Avenue
General information on each joint venture
Economic interest (as a percent)	90.93%		90.93%
Approximate square feet unaudited (sqft)	563,000		563,000
New York State Teacher's Retirement System | Due from joint venture | 919 Third Avenue
General information on each joint venture
Economic interest (as a percent)	51.00%		51.00%
Approximate square feet unaudited (sqft)	1,454,000		1,454,000
Private Investor / Wharton Properties | Due from joint venture | 11 West 34th Street
General information on each joint venture
Economic interest (as a percent)	30.00%		30.00%
Approximate square feet unaudited (sqft)	17,150		17,150
Vornado Realty Trust | Due from joint venture | 280 Park Avenue
General information on each joint venture
Economic interest (as a percent)	50.00%		50.00%
Approximate square feet unaudited (sqft)	1,219,158		1,219,158
Wharton Properties | Due from joint venture | 1552-1560 Broadway
General information on each joint venture
Economic interest (as a percent)	50.00%		50.00%
Approximate square feet unaudited (sqft)	57,718		57,718
Wharton Properties | Due from joint venture | 650 Fifth Avenue
General information on each joint venture
Economic interest (as a percent)	50.00%		50.00%
Approximate square feet unaudited (sqft)	69,214		69,214
Wharton Properties | Due from joint venture | 1552 Broadway
General information on each joint venture
Economic interest (as a percent)	50.00%		50.00%
PGIM Real Estate | Due from joint venture | 11 Madison Avenue
General information on each joint venture
Economic interest (as a percent)	60.00%		60.00%
Approximate square feet unaudited (sqft)	2,314,000		2,314,000
National Pension Service of Korea / Hines Interest LP | Due from joint venture | One Vanderbilt Avenue
General information on each joint venture
Economic interest (as a percent)	60.01%		60.01%
Approximate square feet unaudited (sqft)	1,657,198		1,657,198
RXR Realty / New York REIT | Due from joint venture | Worldwide Plaza
General information on each joint venture
Economic interest (as a percent)	24.95%		24.95%
Approximate square feet unaudited (sqft)	2,048,725		2,048,725
Allianz Real Estate of America | Due from joint venture | 1515 Broadway
General information on each joint venture
Economic interest (as a percent)	56.87%		56.87%
Approximate square feet unaudited (sqft)	1,750,000		1,750,000
Israeli Institutional Investor | Due from joint venture | 2 Herald Square
General information on each joint venture
Economic interest (as a percent)	95.00%		95.00%
Approximate square feet unaudited (sqft)	369,000		369,000
A fund managed by Meritz Alternative Investment Management | Due from joint venture | 15 Beekman
General information on each joint venture
Economic interest (as a percent)	20.00%		20.00%
Approximate square feet unaudited (sqft)	221,884		221,884
A fund managed by Meritz Alternative Investment Management | Due from joint venture | 220 East 42nd Street
General information on each joint venture
Economic interest (as a percent)	51.00%		51.00%
Approximate square feet unaudited (sqft)	1,135,000		1,135,000
National Pension Service of Korea / Hines Interest LP / International Investor | One Madison Avenue
General information on each joint venture
Investment in joint venture aggregate maximum ownership percentage						25.00%
National Pension Service of Korea / Hines Interest LP / International Investor | Due from joint venture | One Madison Avenue
General information on each joint venture
Economic interest (as a percent)	25.50%		25.50%
Approximate square feet unaudited (sqft)	1,048,700		1,048,700
Korean Institutional Investor / Israeli Institutional Investor | 450 Park Avenue | Third-Party
General information on each joint venture
Investment in joint venture, partners' ownership percentage	25.00%		25.00%
Ownership Interest	49.90%		49.90%
Korean Institutional Investor / Israeli Institutional Investor | Due from joint venture | 450 Park Avenue
General information on each joint venture
Economic interest (as a percent)	25.10%		25.10%
Approximate square feet unaudited (sqft)	337,000		337,000
Investment in joint venture, ownership percentage	25.10%		25.10%
Ownership Interest	50.10%		50.10%
U.S. Affiliate of Mori Trust Co., Ltd | Due from joint venture | 245 Park Avenue
General information on each joint venture
Economic interest (as a percent)	50.10%		50.10%
Approximate square feet unaudited (sqft)	1,782,793		1,782,793