Burj Khalifa, Khalifa also spelled Khalīfah, mixed-use skyscraper in Dubai, U.A.E., that is the worlds tallest building, according to all three of the main criteria by which such buildings are judged (see Researchers Note: Heights of Buildings). Burj Khalifa (Khalifa Tower), known during construction as Burj Dubai, was officially named to honour the president of the neighbouring emirate of Abū Ẓaby, Sheikh Khalīfah ibn Zāyid Āl Nahyān. Although the tower was formally opened on Jan. 4, 2010, the entirety of the interior was not complete at that time. Built to house a variety of commercial, residential, and hospitality ventures, the towerwhose intended height remained a closely guarded secret throughout its constructionreached completion at 162 floors and a height of 2,717 feet (828 metres). It was designed by the Chicago-based architectural firm of Skidmore, Owings & Merrill. Adrian Smith served as architect, and William F. Baker served as structural engineer.
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