San Leandro, Union City, Fremont, and further East like Danville and Pleasanton can be pretty bad to walk around in. The West part of the Bay has generally been

San Leandro, Union City, Fremont, and further East like Danville and Pleasanton can be pretty bad to walk around in. The West part of the Bay has generally been wealthier and historically had more pedestrian affordances. I'm pretty sure all of these factors go into making the Bay as a whole such an expensive and desirable place to live.