San Diego is cutting back an incentive that encourages owners of single-family lots to build accessory dwelling units (ADUs), the backyard apartments known as Granny flats that California has embraced as a key solution to its housing crisis.

In a 6-3 vote, the City Council decided on Tuesday to limit the reach of the city’s bonus ADU incentive program, eliminating it in eight neighborhoods zoned for single-family homes where lot sizes tend to be larger than other types of those properties in different areas of the city.

San Diego has one of the most aggressive ADU incentives in California. The city’s program lets property owners in designated neighborhoods near transit routes build a potentially unlimited number of ADUs on a single-family lot.

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