870 United Nations Plaza is a significant twin-towered, 38-story apartment and office complex completed in 1966, designed by the architectural firm Harrison, Abramovitz & Harris, who also designed the United Nations Headquarters. The building contains 334 residential units, including 56 duplexes on the top eight floors, with a six-story base housing 300,000 square feet of office space.
The complex features a distinctive black glass façade in the Miesian tradition, deliberately designed to complement but not overshadow the UN Secretariat Building. Its full-block footprint includes New York City's longest private driveway, leading to a grand triple-height lobby overlooking an enclosed garden court. The apartments are characterized by large, tall windows offering panoramic views of the East River, United Nations complex, and Manhattan skyline.
As the first twin-towered residential project on Manhattan's East Side, the building played a pioneering role in the area's development, following the architectural precedent set by similar structures on Central Park West. Its location at the foot of Beekman Place positions it within one of Manhattan's most distinguished neighborhoods.
The building operates as a luxury cooperative with comprehensive amenities including 24-hour doorman and concierge services, a fitness center with Pilates studio, Club 39 resident lounge with catering kitchen, conference rooms, golf simulator, billiards room, and multiple sun decks. Additional services include in-house dry cleaning, on-site management, and a parking garage.
The property maintains a staff of 53 members providing round-the-clock service and security. Notably, the building permits pet ownership and allows purchases through Qualified Personal Residential Trusts, with 75% financing permitted. Monthly maintenance includes utilities and window washing services.
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For some co-ops, instead of price per square foot, we use an estimate of the number of rooms for each sold apartment to chart price changes over time. This is because many co-op listings do not include square footage information, and this makes it challenging to calculate accurate square-foot averages.
By displaying the price per estimated room count, we are able to provide a more reliable and consistent metric for comparing sales in the building. While we hope that this gives you a clearer sense of price trends in the building, all data should be independently verified. All data provided are only estimates and should not be used to make any purchase or sale decision.
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