Sky City

Sky City or Sky City One, is an 838 m (2,749 ft) tall skyscraper under construction in the city of Changsha, Hunan in south-central China. The prospective builders, Broad Sustainable Building, estimated it would take just 90 days to construct, but this is not counting 120 days of prefabrication before on-site work commences; the total schedule is 210 days. Construction was halted in August 2013 after government regulators required additional approvals. When completed, it would be the tallest building in the world, 10 m (33 ft) taller than the current record holder, the Burj Khalifa in Dubai.