Sonoma County supervisors are signing off on a plan to sell land where Community and Sutter hospitals once stood in Santa Rosa. Supervisors yesterday unanimously approved a deal to transform 82 acres off Chanate Road in northeast Santa Rosa into a high-profile housing complex. The eleven-and-a-half-million-dollar deal with developer Bill Gallaher clears the way for him to build up to 800 rental units, plus housing for veterans, an amphitheater and other amenities.