what is the first floor of a building
Storey In English, the principal floor or main floor of a house is the floor that contains the chief apartments; it is usually the ground floor, or the floor above. In Italy the main floor of a home is usually above the ground level, and may be called the piano nobile ("noble floor").
List of tallest buildings in the United States As of 2013, One World Trade Center in New York City was considered to be the tallest skyscraper in the United States. Its spire brings the structure to a symbolic height of 1,776 feet (541 m), connoting the year The Declaration of Independence was signed, though the tip of the structure actually is measured at 1,792 ft (546 m).[3] However, using the more common criterion for the height of a building (the roof, not antenna) the observation deck elevation and highest occupied floor of the One World Trade Center are surpassed by Chicago's Willis Tower (formerly the Sears Tower)[4] and 432 Park Ave.