China’s Sky City to Grow Up to be World’s Tallest Building in Only 90 Days

Tuesday, 20 Nov 2012 02:46 PM

By Michael Mullins

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Aptly named Sky City, China’s newest skyscraper in Changsha city will rise to 2,749 feet (838 meters), consist of 220 floors and, say the project’s engineers, be completed in just 90 days — a fast-track rate of five stories per day. It will also happen to be the tallest building in the world.

Chicago’s Sears tower, which once held the title of world’s tallest building, is 1,451 feet high. Manhattan’s Empire State Building has a roof height of 1,250 feet (381 meters).

The remarkable Chinese feat will be accomplished by the same company that constructed a 30-story hotel in 15 days earlier this year, also in Changsha city. Broad Sustainable Building, which has built 20 tall structures throughout China, developed a prefabricated modular technology which engineers say allow for such quick constructions.

According to, Sky City will be 83 percent residential, containing both low-income and luxury units for 31,400 people. The structure will also house office space, schools, restaurants, shops and hospitals.

Approximately 200,000 tons of steel will be used in the massive structure, which according to Broad Sustainable Building will able to withstand a 9.0 magnitude earthquake and resist fire for up to three hours.

The building will also be environmentally-friendly, equipped with thermal insulation, fresh air heat-recovery systems and four-paned windows, which increases energy efficiency by reducing heat loss.

And the price tag: only $1,500 per square meter. In comparison, Dubai’s 160-story Burj Khalifa, which is currently the world’s tallest building at 2,716.5 feet (828 meters), cost $15,000 per square meter. According to the construction company, some of the same engineers who previously worked on the Burj Khalifa project will be working on the Sky City project.

With the building’s foundation being laid at the end of November, construction will follow shortly and is expected to be completed in late March 2013.

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