The Silver Spring, Md., headquarters of media company Discovery Communications was the first building in Maryland to receive any sort of LEED recognition three years ago when it snagged a Platinum rating. Elements of its green building strategy include an extensive system of rainwater capture and reuse, automated scheduling of heating, air-conditioning and ventilation (HVAC) services during off-peak hours, thorough recycling initiatives, and heavy use of carbon offsets and wind power renewable energy certificates. The design of the building has helped Discovery save more than 24,000 gallons of water annually and reduce carbon emissions by more than 260 tons annually. (Photo courtesy of Discovery Communications)