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, specifically the borough of Manhattan, notably 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 always 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 , connoting the year the U.S. Declaration of Independence was signed, though the absolute tip (or pinnacle) of the structure is measured at . However, the observation deck elevation and highest occupied floor of One World Trade Center are surpassed by Central Park Tower, 432 Park Avenue and Chicago's Willis Tower (formerly and still commonly known as the Sears Tower). 111 West 57th Street, and Tribune East Tower will also have higher occupied floors and roofs upon their completion. Prior to the September 11 attacks in New York City, the twin towers of the first World Trade Center occupied the second and third positions on the list below, The North Tower (1 WTC) stood at , while the South Tower (2WTC) was tall. If they were still standing today, they would occupy the seventh and eighth positions on the list below, with their replacement—the new One World Trade Center—being excluded. There are numerous supertall buildings both proposed and under construction throughout the country, concentrated in New York City and Chicago. In New York City, 270 Park Avenue is currently under construction. In Chicago, preparation work for Tribune East Tower has begun. Other tall buildings that are proposed include the One Bayfront Plaza, and the One Brickell City Centre in Miami. Tallest buildings This list ranks completed and topped-out buildings in the United States that stand at least tall, based on standard height measurement which includes spires and architectural details, but excludes antenna masts. An equal sign (=) following a rank indicates the same height between two or more buildings. The "Year" column indicates the