Architecture of Chicago a new structural system of framed tubes in skyscraper design and construction. The first building to apply the tube-frame construction was the DeWitt-Chestnut Apartment Building which Khan designed and was completed in Chicago by 1966. This laid the foundations for the tube structures of many other later skyscrapers, including his own constructions of the John Hancock Center and Willis Tower (then named the Sears Tower) in Chicago and can be seen in the construction of the World Trade Center, Petronas Towers, Jin Mao Building, and most other supertall skyscrapers since the 1960s. Willis Tower would be the world's tallest building
Wachovia Tower (Baltimore) Tower rises from the site formerly occupied by the Calvert Building and 7-9 Saint Paul Street. The building, formerly housing offices for Wachovia, is now home to the regional office of Wells Fargo and Company. Wachovia Tower (Baltimore) The Wells Fargo Tower, formerly known as the First Union Signet Tower, Wachovia Tower, and Union Trust Building, is a commercial high-rise in Baltimore, Maryland. The building rises 24 floors above street level and is in height; it is tied with Charles Center South as the 17th-tallest building in the city. The structure was completed in 1985. The Wells Fargo Tower was