Chinese Firm Gains Approval, Hype to Raise World’s Tallest Building in Only 90 Days China has ten cities bigger than New York. Almost half of the world’s 20 tallest skyscrapers under construction today are in China. Naturally, China’s builders are chomping at the bit to get things done, like yesterday. But no one can erect the tallest skyscraper on the planet in three months…right? We may find out