SB9, or the California Housing Opportunity and More Efficiency (HOME) Act, mandated that cities permit an additional residential unit on parcels zoned for single-dwelling units. It allowed for a total of two residential units in such zones, excluding accessory dwelling units (ADUs). Enacted in September 2021, the law took effect statewide on January 1, 2022. Locally, SB9 applied solely to properties in the R1 (Single-Unit Residential) and OP1 (Ocean Park Single-Unit Residential) Zones. Certain exemptions prevented displacement of current residents, including properties within hazard zones, historic districts, containing price-controlled units, subject to recent Ellis Act removal, or necessitating the removal of over 25% of existing structure walls.

Read More: https://smdp.com/2024/04/25/housing-law-that-would-densify-single-family-neighborhoods-ruled-unconstitutional/