Lever House is a office building at 390 Park Avenue in the Midtown Manhattan neighborhood of New York City. The building was designed in the International Style by Gordon Bunshaft and Natalie de Blois of Skidmore, Owings & Merrill (SOM) as the headquarters of soap company Lever Brothers, a subsidiary of Unilever. Constructed from 1950 to 1952, it was the second skyscraper in New York City with a glass curtain wall, after the United Nations Secretariat Building. The building contains 21 office stories topped by a triple-height mechanical section. The ground story contains a courtyard and public space, while the second story overhangs the plaza on a set of columns. The remaining stories are designed as a slab occupying the northern one-quarter of the site. The slab design was chosen to conform with the city's 1916 Zoning Resolution while avoiding the need for setbacks, which had been included in previous skyscrapers built under the ordinance. Lever House contains about of interior space, much less than in comparable office buildings. The construction of Lever House changed Park Avenue in Midtown from an avenue with masonry apartment buildings to one with International-style office buildings. The building's design was also copied by several other structures worldwide. Lever House was intended solely for Lever Brothers' use, and its small size resulted in proposals to redevelop the site with a larger skyscraper. Following one such proposal, the building became a New York City designated landmark in 1982 and was added to the National Register of Historic Places in 1983. Unilever moved most of its offices out of Lever House in 1997, and Aby Rosen's RFR Realty took over the building. After SOM renovated the building from 2000 to 2001, Lever House was used as a standard office building with multiple tenants. SOM renovated the building again starting in 2022. Site Lever House is at 390 Park Avenue, on the western sidewalk between 53rd Street and 54th Street, in the Midtown Manhattan neighborhood of New York City. The land lot has a frontage of on Park Avenue, on 54th Street, and on 53rd Street, giving the lot a slight "L"-shape. The lot has an area of . Nearby buildings include the DuMont Building and Hotel Elysée along the same city block, on 54th Street to the west; 399 Park Avenue directly across Park Avenue to the east; the Seagram Building diagonally across Park Avenue and 53rd