https://www.mercurynews.com/2021/03/01/is-this-the-end-of-single-family-zoning-in-the-bay-area/

A small, city-by-city planning revolution is underway in the Bay Area, potentially transforming residential neighborhoods across the region.

More than 80 percent of residential property in the Bay Area is zoned exclusively for single-family homes, but recent efforts by leaders in Berkeley, San Jose and other cities are challenging restrictions that prevent small apartments in suburban subdivisions and on many city blocks.