1. Willis Tower (formerly Sears Tower), Chicago, 1974: 1,451 feet. | John J. Kim~Sun-Times
The tallest completed buildings in the United States, as measured from the lowest public entrance to the highest architectural element, not including antennas. After it is finished, One World Trade Center may take over the top spot, but only if you count its rooftop spire, which reaches to 1,776 feet.