The world's first skyscraper was built in Chicago in 1885. Since then, the United States has been home to some of the world's tallest skyscrapers. New York City, and especially the borough of Manhattan, has the tallest skyline in the country. Eleven American buildings have held the title of tallest building in the world. New York City and Chicago have been the centers of American skyscraper building. The 10-story Home Insurance Building, built in Chicago in 1885, is regarded as the world's first skyscraper; the building was constructed using a novel steel-loadbearing frame which became a standard of the industry worldwide.
Since its topping out in 2013, One World Trade Center in New York City has been the tallest skyscraper in the United States. Its spire brings the structure to a symbolic architectural height of 1,776 feet (541 m), connoting the year the Declaration of Independence was signed, though the absolute tip (or pinnacle) of the structure is measured at 1,792 ft (546 m). However, the observation deck elevation and the height to the highest occupied floor of One World Trade Center are surpassed by Central Park Tower, 432 Park Avenue, 111 West 57th Street, and Chicago's Willis Tower, which was formerly and is still commonly known as Sears Tower. Tribune East Tower in Chicago, 350 Park Avenue, and 175 Park Avenue, in New York City will also have higher occupied floors and roofs upon their completion.
