Five years ago, Ron Bigelow and his wife Ellis were seeking a nearly net-zero project in Menlo Park, California. They hoped to lessen their environmental impact (and their energy bills) with such a design. With the help of San Francisco-based firm Butler Armsden Architects, the Bigelows are now the proud owners of a Prairie-meets-midcentury modern home that's on track to receive LEED Platinum certification. The house's layout, a cluster of three pavilions connected by breezeways and a bridge, solves two problems. First, that arrangement help preserve trees on the site. Second, the semi-outdoor pathways among the three structures don't officially count towards the home's size, avoiding running afoul of building codes that limit aggregate square footage. From the start of the design process, the Bigelows played the unusual role of actually participating in a design charrette with the architects, eager to learn more about LEED in the process of designing their own home.