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
Trump International Hotel and Tower (Chicago) Trump International Hotel and Tower (Chicago) The Trump International Hotel and Tower is a skyscraper condo-hotel in downtown Chicago, Illinois. The building, named after businessman and current U.S. President Donald Trump was designed by architect Adrian Smith of Skidmore, Owings and Merrill. Bovis Lend Lease built the 98-story structure, which reaches a height of including its spire, its roof topping out at . It is next to the main branch of the Chicago River, with a view of the entry to Lake Michigan beyond a series of bridges over the river. The building received publicity when the winner of the