This report from the Center for the Study of Energy Markets at the University of California at Berkeley examines the economic impact of green buildings. Buildings that are certified as green command higher rents by about 3-6% and sell for about 16% more. These conclusions are based on a study of more than 10,000 buildings. Buildings consume about 40% of the world energy and emit about 30% of the worldwide green house gases. Buildings were rated using Energy Star and LEED (Leadership in Energy and Environmental Design). The statistical methodology is described in detail.