Flatiron Building. The Flatiron Building, originally the Fuller Building, is a triangular 22-story, 285-foot-tall steel-framed landmarked building at 175 Fifth Avenue in the eponymous Flatiron District neighborhood of the borough of Manhattan in New York City.
   Designed by Daniel Burnham and Frederick P. Dinkelberg, and known in its early days as Burnham's Folly, it was completed in 1902 and originally included 20 floors. The building sits on a triangular block formed by Fifth Avenue, Broadway, and East 22nd Street, where the building's 87-foot back end is located, with East 23rd Street grazing the triangle's northern peak.
   The name Flatiron derives from its triangular shape, which recalls that of a cast-iron clothes iron. The Flatiron Building was developed as the headquarters of construction firm Fuller Company, which acquired the site from the Newhouse family in May 1901.
   Construction proceeded at a very rapid pace, and the building opened on October 1, 1902. A cowcatcher retail space and a one-story penthouse were added shortly after the building's opening.
   The Fuller Company sold the building in 1925 to an investment syndicate. The Equitable Life Assurance Society took over the building after a foreclosure auction in 1933 and sold it to another syndicate in 1945. Helmsley-Spear managed the building for much of the late 20th century, renovating it several times. The Newmark Group started manag
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