One Dallas Center (formerly Patriot Tower) is a modernist skyscraper located in the City Center District of downtown Dallas, Texas (USA), completed in 1979. The building has 30 floors and rises 448 feet (137 meters). One Dallas Center is currently tied with the Adam's Mark Hotel North Tower as the 25th-tallest building in the city. The building was originally planned as part of a three-building complex designed by I.M.