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Burj Khalifa is a skyscraper in Dubai and the tallest man-made structure ever built, at 828 m. It was known as Burj Dubai prior to its inauguration. The price of office space real estate had reached US$4,000 per sq ft in 2009. Construction began on 21 September 2004, with the exterior of the structure completed on 1 October 2009. The building officially opened on 4 January 2010.
http://www.funonthenet.in/articles/burj-khalifa-dubai.html
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