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Greenbrae is a small unincorporated community in Marin County, California. It is located 1.5 miles south-southeast of downtown San Rafael, at an elevation of 33 feet, located adjacent to U.S. Route 101 at the opening of the Ross Valley. With its sunny weather and central Marin location, Greenbrae is a big draw for those who want close proximity to abundant open space, along with the advantages of a major metropolitan area. It’s no wonder Greenbrae real estate is in high demand.