No they are lower. The 9 bay area counties have a lot of diversity from San Jose which is on the southeastern tip of the bay to Sausalito on the northern end. From rough patches in East Palo Alto to gated communities in Portola. Things that affect prices: schools, commute, amenities (near the woods, libraries, county services, etc), and micro-climate (farther south is a lot warmer than closer to the water).