Building mammoth skyscrapers these days just doesn't take anywhere near as long as it used to, but 90 days? Sheesh - that's nothing. Sky City will sport 220 floors and reach a dizzying 2,749 feet (838m) and will be built in Changsha City, near the Xiangjiang river in just 90 days - yes, just three months.
So, to have Sky City completed in just 90 days, we're looking at an amazing five floors being built, per day! The building has been designed by some of the same engineers who had a hand in building the Burj Khalifa, as well as the company that built the 30-story hotel in just 15 days, which is still in perfect working condition. Foundation on the new building starts at the end of December, where they're just waiting on Chinese authorities to give the final nod to begin construction.