<Tr> <Th> Added to NRHP </Th> <Td> November 20, 1979 </Td> </Tr> <Tr> <Th> Designated NHL </Th> <Td> June 29, 1989 </Td> </Tr> <Tr> <Th> Designated NYCL </Th> <Td> September 20, 1966 </Td> </Tr> <P> The Flatiron Building, originally the Fuller Building, is a triangular 22 - story steel - framed landmarked building located at 175 Fifth Avenue in the borough of Manhattan, New York City, which is considered to be a groundbreaking skyscraper . Upon completion in 1902, it was one of the tallest buildings in the city at 20 floors high and one of only two skyscrapers north of 14th Street--the other being the Metropolitan Life Insurance Company Tower, one block east . The building sits on a triangular block formed by Fifth Avenue, Broadway, and East 22nd Street--where the building's 87 - foot (27 m) back end is located--with East 23rd Street grazing the triangle's northern (uptown) peak . As with numerous other wedge - shaped buildings, the name "Flatiron" derives from its resemblance to a cast - iron clothes iron . </P>

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