High Quality Content by WIKIPEDIA articles! The U.S. city of Austin, Texas is the site of 121 high-rises, 46 of which stand taller than 180 feet (55 m). The tallest building in the city is the 56-story Austonian, which is 683 ft (208 m) tall. Completed in 2010, it is the tallest building in Texas outside Houston and Dallas and the tallest residential tower west of the Mississippi River. The second-tallest building is 360 Condominiums, which stands 563 ft (172 m) and was Austin`s tallest from 2008 to 2010. The third-tallest building in the city is the Frost Bank Tower, which was Austin`s tallest structure from 2004 until 2008.