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
Southwest Tower Building of Texas phone center to Sears Vinyl Siding. When it opened in 1972 it was considered the leading business tower in the city. (Austin American-Statesman November 18, 1972) The Southwest Tower Building was the site of a fire on Sunday, March 6, 2011. No cause has been given for the fire. Southwest Tower Building The Southwest Tower Building is a 12-storey, building at 211 East 7th St. in Downtown Austin, Texas and is located across the street from the historic Driskill Hotel and the modern Omni Hotel. On the edge of the E. 6th Street entertainment district and Congress Avenue,