White flight
Sobrante Park is a neighborhood located in East Oakland, California, which is partially separated from the rest of the city by two railroad tracks and San Leandro Creek. It was built shortly after World War II, first as a White-Only Lockout and then gradually becoming a White flight red-zone in the mid to late 1950s, and in the early 1960s it became a working-class black neighborhood. It was projected by planners that there would be no in-road into San Leandro's Davis St. residential area which was developed during the same period.