Colby’s Diamond Building has received LEED certification from the U.S. Green Building Council. The LEED green building rating system is the national benchmark for sustainable construction. Many factors make Diamond a green building. They include the use of local materials, the use of materials with recycled content (including carpeting and wallboard), about 84 percent of construction waste being diverted from landfills, occupancy sensors in classrooms that avoid electricity waste, and a touch-screen display in the lobby that allows visitors to learn about these and other green features.