The mission of A Community of Friends includes the intent to build quality permanent supportive housing for our tenants. As part of our desire to build communities that best support our tenants’ needs, ACOF also strives to build environmentally-efficient, sustainable communities that best support our planet. The Living Building Challenge, LEED^® Certification, and NetZero are green building programs that recognize best-in-class sustainable building strategies and practices. These programs are an integral part of ACOF’s housing development strategy.