https://www.siliconvalley.com/2021/09/16/gov-newsom-abolishes-single-family-zoning-in-california/

In one of his first actions after surviving an election seeking to oust him from office, Gov. Gavin Newsom on Thursday essentially abolished single-family zoning in California — and green-lighted a series of bills intended to bolster the state’s housing production.

By signing Senate Bill 9 into law, Newsom opened the door for the development of up to four residential units on single-family lots across California. The move follows a growing push by local governments to allow multi-family dwellings in more residential neighborhoods. Berkeley voted to eliminate single-family zoning by Dec. 2022, and San Jose is set to consider the issue next month.