The Frost Bank Tower is a skyscraper in Austin, Texas, United States. Standing 515 feet tall with 33 floors, it is the fifth tallest building in Austin, behind The Independent, 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 525,000 sq ft of leasable space. It was the first high-rise building to be constructed in the United States after the 9/11 attacks.