Top 10 Green Buildings, 2011

OS House, Racine, Wis.
Johnsen Schmaling Architects
This LEED platinum-rated house shows how a small building can go green even without a massive budget. Taking advantage of the breeze from nearby Lake Michigan and the site's solar exposure, outdoor rooms reduce the house's depth, which allows for better cross-ventilation. A compact structured plumbing system with low-flow fixtures and an on-demand hot-water circulator pump reduces water consumption.

• The Eco-Utopian Visions of Architect Vincent Callebaut