270 Park Avenue, also known as the JPMorgan Chase Building, is a supertall skyscraper on the East Side of the Midtown neighborhood of Manhattan in New York City.

[8] The site of the future 270 Park Avenue was occupied by a six-building complex, the Hotel Marguery, which opened in 1917 and was developed by Charles V. Paterno.

[16] There are 24 massive columns at the base,[17] which will support a lobby measuring about 80 feet (24 m) high, with public space facing Madison and Park Avenues.

[19] To comply with city legislation, which bans the use of natural gas in all new buildings constructed after 2027, the structure will be powered entirely by hydroelectric energy.

[27] However, this also raised concerns that the taller building would require deeper foundations that could interfere with the Metropolitan Transportation Authority's East Side Access tunnels and the Grand Central Terminal's rail yards, which are directly underneath 270 Park Avenue.

[29][30] In order to secure approvals, JPMorgan was required to contribute $40 million to a district-wide improvement fund and incorporate a new 10,000 square feet (930 m2) privately owned public space plaza in front of the tower.

After pressure from Manhattan Borough President Gale Brewer and City Council member Keith Powers, JPMorgan also agreed to fund numerous upgrades to the public realm surrounding the building, including improvements to Grand Central's train shed and a new entrance to the station at 48th Street.

[33] In July 2019, JPMorgan Chase signed an agreement with MTA in which the bank guaranteed that the demolition of 270 Park Avenue would not delay work on East Side Access.

[34] That month, scaffolding was wrapped around the tower and podium structure on the Madison Avenue side of the building, the first step in an anticipated 18-month demolition effort.

[41] In April 2022, JPMorgan CEO Jamie Dimon announced that he would further consolidate the company's New York City offices at 270 Park Avenue, since half of the staff would be able to work from home at least part of the time.

[56] By the end of 2024 the tower crane had been removed although the construction elevator remained in place on 48th Street, with interior and exterior work continuing in preparation for occupancy in 2025.

[57] Architectural critic Alexandra Lange described the new 270 Park Avenue in 2022 as "a Son of Hearst Tower grafted on top of creepy legs.