Sink Combs Dethlefs is an architectural firm established in 1962. Based in Denver, Colo., the company has completed a variety of architectural projects across the United States and around the globe. It works with various representatives from municipalities, private developers, government agencies, educational and other institutional client teams to create customer specified designs. The firm s project portfolio includes several arenas, college athletic and recreational centers, educational institutions, stadiums, residential buildings, commercial offices, entertainment facilities, and others. Sink Combs Dethlefs is a member of the U.S. Green Building Council (USGBC).