Frost Bank Tower is a skyscraper in Austin , Texas , United States . Standing 515 feet ( 157 m ) tall with 33 floors , it is the fourth tallest building in Austin , behind The Austonian , Fairmont Austin , and the 360 Condominiums . It was developed by Cousins Properties from November 2001 to December 2003 as a class A office building with of leasable space . It was the first high-rise building to be constructed in the United States after the 9/11 attacks . The building was officially dedicated in January 2004
9/11 attacks
September 11 attacks
Frost Bank Tower