 Complete the following phrase:  The U.S. Steel Building later known as One Liberty Plaza was built on the site and completed in 1973. One Liberty Plaza contained per floor, compared with the per floor in the Singer Buildings tower. One Liberty Plaza had at least twice the two former buildings combined interior area. At the time of the Singer Buildings demolition, it was the tallest building ever to be destroyed. The record remained until the September 11, 2001, terrorist attacks, which caused the 