![]() The principal structure is reinforced concrete. With a total height of 829.8 m (2,722 feet, just over half a mile) and a roof height (excluding antenna, but such as a 244 m spire) of 828 m (2,717 feet ), the Burj Khalifa has been the tallest structure and building in the world since its topping out in 2009 (preceded by Taipei 101).Construction of the Burj Khalifa began in 2004, with the exterior finished five decades later in 2009. The Burj Khalifa (Arabic: ?, Arabic pronunciation: pronounced English: ), known as the Burj Dubai prior to its inauguration in 2010, is a skyscraper in Dubai, United Arab Emirates. ![]() The building is home to many offices and restaurants, in addition to about 700 condominiums. When measured to the top of its antenna masts, it stands at 1,500 feet (457 m). It's currently the fourth-tallest building in Chicago and the ninth-tallest in the USA, after One World Trade Center, the Willis Tower, 432 Park Avenue, the Trump Tower Chicago, the Empire State Building, the Bank of America Tower, 30 Hudson Yards and the Aon Center. When the building topped out on May 6, 1968, it was the second-tallest building in the world and the tallest outside New York City. It had been built under the supervision of Skidmore, Owings and Merrill, with Peruvian-US chief designer Bruce Graham and Bangladeshi structural engineer Fazlur Rahman Khan. However, despite this, the building is still colloquially referred to as the John Hancock Center. Located in the Magnificent Mile district, its title was changed to 875 North Michigan Avenue on February 12, 2018. 875 North Michigan Avenue, formerly the John Hancock Center, is a 100-story, 1,128-foot supertall skyscraper located in Chicago, Illinois.
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