Willis Tower, Skyscraper in Chicago, Illinois, United States

Willis Tower is a 108-story, 1,451-foot (442 m) skyscraper in Chicago, Illinois, United States. At the time of its completion in 1973, it was the tallest building in the world, surpassing the World Trade Center towers in New York, and it held this rank for nearly 25 years. Willis Tower is the second-tallest building in the United States and the eighth-tallest freestanding structure in the world. The skyscraper is one of the most popular tourist destinations in Chicago, and over one million people visit its observation deck each year. Named the Sears Tower throughout its history, in 2009 the Willis Group obtained the right to rename the building, as part of their lease on a portion of its offices. On July 16, 2009, the building was officially renamed Willis Tower.

United Airlines moved its corporate headquarters to Willis Tower from the United Building at 77 West Wacker Drive in August 2012. As of December 2013, United is the Willis Tower's largest tenant, with its headquarters and operations center occupying around 20 floors of the tower. Sources

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Chrysler Building, An Art Deco Style Skyscraper, New York City

Chrysler Building, An Art Deco Style Skyscraper The Chrysler Building is an Art Deco style skyscraper in New York City, located on the east side of Manhattan in the Turtle Bay area at the intersection of 42nd Street and Lexington Avenue. At 1,046 feet (319 m), the structure was the world's tallest building for 11 months before it was surpassed by the Empire State Building in 1931. It is still the tallest brick building in the world, albeit with an internal steel skeleton. After the destruction of the World Trade Center, it was again the second-tallest building in New York City until December 2007, when the spire was raised on the 1,200-foot (365.8 m) Bank of America Tower, pushing the Chrysler Building into third position. In addition, The New York Times Building, which opened in 2007, is exactly level with the Chrysler Building in height. Both buildings were then pushed into 4th position, when the under construction One World Trade Center surpassed their height. Chrys...

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