The Austonian is a residential skyscraper in Downtown Austin, Texas, USA. At 683 feet (208 m) tall with 56 floors, the building is the tallest in Austin, overtaking the 360 Condominiums. The tower is also the tallest all-residential building in the U.S. state of Texas, and it overtook San Antonio's Tower Of The Americas as Texas' tallest building outside of Houston or Dallas. Also, it is the tallest all-residential building in America west of the Mississippi. The 53rd floor was taller than the previous tallest, 360 Condominiums. The building opened in June 2010.