Sky City

Sky City , is a 838 m (2,749 ft) tall skyscraper under construction in the city of Changsha, Hunan, in south-central China. Manufacturers prospective, Broad Sustainable Building, estimates that it takes just 90 days to build, but this does not count 120 days prior to the commencement of works on-site prefabrication beginning .. the total time of 210 days the construction was halted in August 2013 after government regulators require additional approvals Once completed, it will be the tallest building in the world, 10 m (33 ft) higher than the current record holder, the Burj Khalifa in Dubai..