In 1998 , T.Stacy & Associates consolidated tracts of land at the building site , at the time a vacant lot , and sold it to Cousins Properties in 2001 . Their original plan called for a building with 27 floors , but the final plan called for a tall building with 33 floors . As the building began construction on November 27 , 2001 , it became the tallest building in the United States of America to be constructed after the September 11 attacks . Construction was finished about 2 years later in 2003 , and the tower was officially dedicated in 2004 . It became the tallest building in Austin , Texas , and the fourth tallest building outside of Dallas and Houston , Texas ( excluding the Tower of the Americas in San Antonio ) . In August 2003 cost of the building was estimated at $ 137 million
September 11 attacks
September 11 attacks
Frost Bank Tower