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he Second Unit Center is part of the Home for all initiative in San Mateo County, dedicated to supporting solutions to create more affordable homes for residents, reduce traffic, and make San Mateo County a place everyone can call home.

The purpose of the Second Unit Center is to provide information and tools to make it easier for homeowners to build accessory dwelling units (ADUs, also known as in-law units or granny flats) to help increase the housing supply in the County.

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