A Los Angeles Superior Court judge has ruled that a state law allowing property owners in California to split single-family lots and build additional units, a measure known as SB9, violates the state constitution.

SB9 was enacted in 2021 to address California's housing crisis by opening single-family neighborhoods to higher-density housing. The law allows lot splits that enable homeowners to add up to three accessory dwelling units—also known as granny flats—on their property.

Last week, Judge Curtis Kin sided with five Southern California cities designated as charter cities—Redondo Beach, Whittier, Carson, Del Mar and Torrance—who sued in 2022 arguing that SB9 does not meet the standard required to impose the law on charter cities in the state.

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