A study by Piet Eichholtz and Nils Kok of the University of Maastricht and John Quigley of the University of California, Berkeley has found that buildings with a high Energy Star rating are getting rentals three percent higher per square foot compared with non-green buildings of the same size, location and function. The study was commissioned by RICS (Royal Institution of Chartered Surveyors). Also the researchers looked at the impact on selling prices and found that green buildings are getting a 16% premium. The results are being interepreted as meaning that renters and buyers are willing to pay more for a green building. Thanks to Terry Bennett for bringing this to my attention.