The supertowers are Burj Dubai (where work continues after the completion of 126 floors), Burj Al Alam (slated to rise to 108 floors), the 101-storey Marina 101, Princess Tower (107 floors), the 120-storey Pentominium and Al Burj (which is expected to have between 180 and 200 floors).
Most of these buildings are in various stages of planning and construction although Burj Dubai – tipped to become the world’s tallest tower – is powering ahead, adding a floor a week, and at least three others are in the early stages of construction. Work on Al Burj is not expected to start until Burj Dubai, whose height and floor-level are closely-guarded secrets, is completed.
So Dubai will remain in the news for developing supertowers until at least 2015. No city other than Dubai and Chicago hosts more than one supertower.
Chicago has two – the 108-storey Sears Towers and the 100-storey John Hancock Center. A third, the 118-floor 7 South Dearborn tower, is under construction
source: Gulf News