90 West Street or West Street Building is a building in Lower Manhattan designed by architect Cass Gilbert and structural engineer Gunvald Aus for the West Street Improvement Corporation. When completed in 1907, the building's Gothic styling and ornamentation served to emphasize its 23-story height, and foreshadowed Gilbert's later work on the Woolworth Building. Originally built as an office building, the main tenant was the Delaware, Lackawanna and Western Railroad and the top floor was occupied by Garret's Restaurant, which advertised itself as the "world's highest restaurant".

Located on West Street, between Cedar and Albany Streets, just south of the World Trade Center site, the building had a view to the Hudson River before Battery Park City was built on fill across West Street.

In 1998, the building's exterior was designated an architectural landmark by the city's Landmarks Preservation Commission.

Today, 90 West Street has been meticulously restored, and in 2006, it received a National Preservation Honor Award from the National Trust for Historic Preservation. Restoration of the lobby revealed some of Gilbert's original terra cotta work that had been covered over during an earlier modernization project. During this restoration, the copper roof was replaced and replacement gargoyles were added.The building was converted into apartments and reopened on March 7, 2005.

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