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         Hi ! do you know that the tallest building in the world is under construction,  it is situated in the business bay district of Dubai .  It is considered to be the tallest man made structure on earth, the construction for this is started on September 21, 2004 and still in progress .  The total budget for this project is around US$4 billion, and booking for the office space have already started and it reached a massive $4,000 per sq ft.   As of September 1,2008,  This has reached a height of 688 m with 160 completed floors and expected to see some more increase in its height..Burj Dubai is now the tallest freestanding structure ever built by man.