page_title: Citigroup Center
section_title: Design
hierarchical_section_title: Citigroup Center / Design
caption_attribution_description: Deutsch: Blick auf den New Yorker Stadtteil Queens vom Top of the Rock mit dem Citigroup Center im Vordergrund. English: Panoramic view across Queens, New York, taken from Top of the Rock with the Citigroup Center in the foreground. This &#32;image&#32;was created with Hugin.
context_page_description: The Citigroup Center is an office skyscraper in New York City, located at 53rd Street between Lexington and Third Avenues in midtown Manhattan. Built in 1977 to house the headquarters of Citibank, it is 915 feet tall and has 59 floors with 1.3 million square feet of office space.
  The building has a 45° angled top and a stilt-style base. It was designed by architect Hugh Stubbins and structural engineer William LeMessurier. The building is currently owned by Boston Properties, and in 2009, was renamed 601 Lexington Avenue. In 2016, it was made a New York City designated landmark.
context_section_description: The Citigroup Center is a 59-story, 915-foot-tall (279 m) tower clad in glass and metal facade.
  Structural engineer William LeMessurier designed the tower to be supported by four massive columns 114 feet (35 meters) high, positioned at the center of each side, rather than at the corners. This design allowed the corners of the building to cantilever 72 feet (22 meters). To help accomplish this, LeMessurier employed a system of stacked load-bearing braces, in the form of inverted chevrons. Each chevron is designed to distribute tension loads (due to wind) to their center, then downward into the ground through the uniquely positioned columns.
  The roof of Citigroup Center slopes at a 45-degree angle. Designers originally intended it to be terraces for apartments, and later revised it to contain flat-plate solar collectors, to produce hot water which would be used to dehumidify air and reduce cooling energy. However, they eventually dropped this idea because the positioning of the angled roof meant that the solar panels would not face the sun directly.
caption: Top of the Citigroup Center from the Rockefeller Center
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