World's Largest Solar Energy Office Building

This vast fan-shaped compound in China is the "largest solar-powered office building in the world". Located in Dezhou in the Shangdong Province in northwest China, the 75,000 square meter structure is a multi-use building and features exhibition centers, scientific research facilities, meeting and training facilities, and a hotel - all of which run on solar power.

http://inhabitat.com/worlds-largest-solar-energy-office-building-opens-in-china/