With Google Earth you can "Tour 3D models of Green Buildings around the United States. … includes campus buildings, parks, offices, homes, and schools that were designed and constructed using environmentally sensitive design techniques … start the tour, double-click the "Start tour here" link in the Places panel and make sure the "3D Buildings" layer is checked. The models are also located in the Google 3D Warehouse at http://sketchup.google.com/3dwarehouse "
Via: Google LINK