History of Chicago upper income Americans continued to move from the city for better housing and schools in the suburbs. Office building resumed in the 1960s. When completed in 1974, the Sears Tower, now known as the Willis Tower, at 1451 feet was the world's tallest building. It was designed by the famous Chicago firm of Skidmore, Owings & Merrill, which designed many of the city's famous buildings. Mayor Richard J. Daley served 1955–1976, dominating the city's machine politics by his control of the Cook County Democratic Central Committee, which selected party nominees, who were usually elected in the Democratic stronghold. Daley took
Center City Tower (Philadelphia) Center City Tower (Philadelphia) Center City Tower was the working name of a formerly proposed skyscraper in downtown Philadelphia. Designed and proposed by the firm now known as KlingStubbins (designers of Philadelphia's Penn Center and Bell Atlantic Tower), the building would have risen to a height of 1,050 feet (320 m) and 75 stories, making it the tallest building in The United States outside New York and Chicago, surpassing the height of the Bank of America Plaza in Atlanta. With a floor area of , it is one of the largest in Center City. The building was designed with an