On the Sonoma Plaza, our First Street Sonoma brokerage specializes in all aspects of wine country property including fine homes, vineyards, ranches, and vacation properties. Covering regions north of the Golden Gate Bridge, the office focuses on Napa, Sonoma, Healdsburg, Russian River, the Sonoma Coast, Santa Rosa, and surrounding cities. California's oldest wine-producing region, the area features Sonoma State Historic Park, the site of the Mission San Francisco de Solano, and even the birthplace of the California State flag.