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Burj Khalifa (Khalifa Tower), formerly known as Burj Dubai, is a supertall skyscraper in Dubai, United Arab Emirates, and is the tallest man-made structure ever built, at 828 m (2,717 ft). Construction began on 21 September 2004, with the exterior of the structure completed on 1 October 2009 and the building officially opened on 4 January 2010. The building is part of the 2 km2 (0.8 sq mi) flagship development called Downtown Burj Khalifa at the "First Interchange" along Sheikh Zayed Road, near Dubai's main business district. The tower's architect and engineer is Skidmore, Owings and Merrill, LLP (Chicago). Bill Baker, the Chief Structural Engineer for the project, invented the buttressed core structural system in order to enable the tower to achieve such heights economically. Adrian Smith, who worked with Skidmore, Owings and Merrill (SOM) until 2006, was the Design Partner on the project. The primary builder is a joint venture of South Korean Samsung C&T, who also built the Taipei 101 and Petronas Twin Towers,[9] Besix and Arabtec. Turner Construction Company was chosen as the construction project manager.[10] Under UAE law, the Contractor and the Engineer of Record are jointly and severally liable for the performance of Burj Dubai. Therefore, by adoption of SOMs design and by being appointed as Architect and Engineer of Record, Hyder Consulting is legally the Design Consultant for the tower. برج خليفة (برج دبي سابقاً)، هو ناطحة سحاب ويعد أطول برج في العالم. وهو في دبي بالإمارات العربية المتحدة وتمتلكه شركة إعمار العقارية وهي أكبر شركة عقارية في العالم. إفتتح رسمياً في 4 يناير 2010. بدأ العمل في يناير 2004 الذي يتم بناءه في وسط دبي وتبلغ تكلفته 3.673 مليارات درهم (ما يقارب مليار دولار أميركي)؛ وسيتم افتتاحه في 4 يناير 2010 بحضور الشيخ محمد بن راشد آل مكتوم حاكم دبي. ويبلغ طول البرج 828 مترا و ستكون المساحة الإجمالية 4,000,000 متر مربع وسيضم 37 طابقاً كفندق ليضم 403 جناح فندقي ، و سيضم 54 مصعد كهربائي و سيكون أسرعهم 10م/ثانية ، وللوصول إلى 500 م تحتاج إلى 55 ثانية