Exterior, Concrete Siding Material, House Building Type, Metal Siding Material, Metal Roof Material, and Butterfly RoofLine "Pulling the buildings apart allows what is not a big house to feel really big," says architect Jonathan Feldman of the sustainable retirement home he built for a couple in California. "Because of the ways it opens up, it feels much more expansive than it really is."  Photo 4 of 6 in Focus on Feldman Architecture’s Environmentally-Conscious Homes