https://www.siliconvalley.com/2024/04/25/la-court-strikes-down-controversial-california-law-abolishing-single-family-zoning/

A controversial housing law that abolished single-family zoning across California has been ruled unconstitutional by a Los Angeles County judge — but the narrow ruling is likely to be appealed by the state.

Passed in 2021, SB 9 allows single-family homeowners to split their lots in two and build two homes on each lot — allowing up to four units in each lot previously zoned for just one.