Top 10 Green Buildings, 2011

Research Support Facility at the National Renewable Energy Laboratory (NREL), Golden, Colo.
RNL Design
It makes sense that the building in which cutting-edge research into renewable energy takes place would be one of the greenest structures in the U.S. The facility is meant to create a blueprint for a net-zero-energy future, integrating passive design strategies such as day lighting and natural ventilation. The open office plan reduces the building footprint per person.

• The Eco-Utopian Visions of Architect Vincent Callebaut