Burj Khalifa with Smith's attempts to make the crown more slender. The building opened on 4 January 2010. The tower was designed by Skidmore, Owings and Merrill (SOM), which also designed the Willis Tower (formerly the Sears Tower) in Chicago and the One World Trade Center in New York City. Burj Khalifa uses the bundled tube design of the Willis Tower, invented by Fazlur Rahman Khan. Due to its tubular system, proportionally only half the amount of steel was used in the construction, compared to the Empire State Building. Khan's contributions to the design of tall buildings have had a profound impact
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