About Keegan & Coppin - A dominant North Bay commercial real estate firm since 1976, Keegan & Coppin-ONCOR International provides a full range of services for tenants, property owners, and investors throughout Northern California, North Bay and Sonoma County. With more than 50 agents in 5 strategic offices in the North Bay - Larkspur, Petaluma, Sonoma, Santa Rosa, and Napa - Keegan & Coppin is the largest and most experienced commercial company in the North Bay. Our regional and global capability is facilitated through our ONCOR International affiliation, an organization of the leading commercial real estate firms in major markets across the U.S., Europe, the Americas and Asia. Website information and disclaimer.