With computer-controlled blinds, a system to capture and use roof rainwater, and 40,000 sensors to monitor and control the inside environment, the Genzyme Corp. building in Cambridge, MA was designed to receive the Green Building Council‘s highest rating. No electricity is used for heating or cooling. Waste steam from a nearby power plant is pumped in and 800 windows actually open and close (!!). The building’s features hiked its cost to about 16% more than a conventional building. Thus despite its efficiencies, it is not a prime example for the more practical measures that can be taken to make a building “green.” But it certainly is state-of-the-art.