The quaint cottages in Union City, CA that comprise Mission Sierra enclose spacious one and two bedroom apartment homes. Expansive balconies overlook lavish courtyards in this natural park-like setting. It is an environment that restores, revives and relaxes. While you'll feel as if you've retreated to an oasis in the country, Mission Sierra is actually centrally located and convenient to BART and Highway 880, providing you direct access to San Francisco, the Silicon Valley and the rest of the Bay Area.