Oak Tower is a 28-story building in Downtown Kansas City, Missouri. The building was designed by Hoit, Price & Barnes, which designed various downtown buildings including the Kansas City Power & Light Building, and by I.R. Timlin, who designed the Southwestern Bell Building in St. Louis. It was built to be the Kansas City office of Southwestern Bell and was originally 14 stories/185 feet. In 1929, an addition to the building doubled its height, thus making it the tallest building in the State of Missouri for several years. Its contractor Swenson Construction also built several other landmark Kansas City buildings including the Kansas City Power & Life Building, 909 Walnut, Jackson County Courthouse, Kansas City City Hall, Kansas City Life Stock Exchange and the Western Auto Building. It had a terra-cotta face which was covered in stucco when it was sold in 1974. Oak Tower is one of the key Fiber transit buildings for Kansas City and houses 10-J: The Data Trust Company's primary Tier II data center with over 9000 Sqft of floor space.