China Begins 220-Story Tower

China has begun construction on what will be the world's tallest building, the 220-story Sky City.  Developers claim that the tower will go up in only seven months due to its prefabricated modular plan.  The Observer takes a dim view:

Economically, the building makes absolutely no sense. It will feature over 11 million square feet (or is it 13 million? The facts for this project always seem to be in flux) of floorspace in Changsha, the capital of Hunan province. With more than 7 million inhabitants, Changsha is by no means a small city, but density like this could only possibly pencil out in the densest and most valuable of city cores. And yet, the project appears to be sited outside of the city center, surrounded by acres of open green space.

Here's a promo clip from the developers.