New Homes in the Bay Area where Everything's Included - Green Technology, Preferred Lender Financing, Ideal Neighborhoods & Designer Features! Lennar offers new single-family and condominium homes in some of the most desired real estate locations in the San Francisco Bay Area such as the East Bay, the Peninsula and Contra Costa, Marin, Sonoma, and Santa Clara counties. Lennar currently builds in the cities of Brentwood, Los Altos, Mountain House, Dublin and San Jose. For more information call 877-275-8341.