Rendering of Sky City Changsha. (Courtesy Broad Group)

Move over Burj Khalifa, a group in China has its eye set on building the next world’s tallest skyscraper, and they plan to do it in just 90 days. Called Sky City Changsha, the tower envisioned for central China’s Hunan province could rise nearly 2,750 feet over 220 floors. That’s 32 feet higher than the current world’s tallest in Dubai. Broad Sustainable Building (BSB), an air conditioning manufacturer behind the proposal, will prefabricate building components to achieve the impossibly short deadline.

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