Well not sure about SF but Silicon Valley was partly designed low density to keep out Blacks and low-income people. That was a selling point; that's how 1945-19

Well not sure about SF but Silicon Valley was partly designed low density to keep out Blacks and low-income people. That was a selling point; that's how 1945-1980 suburban American system worked and Santa Clara County was the absolute worst. By the time people were maybe relatively less racist the developers and zoning boards had done the damage. Edit: it was legal or pseudo-legal until 1964 for developers to subtly (or not so subtly) advertise that their new developments would not be seeded with non-whites. It was a selling point.