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About 21 Elements

21 Elements is an award-winning collaborative planning project that helps all the jurisdictions in San Mateo County address their housing needs.

Co-sponsored and coordinated by the San Mateo County Department of Housing (DOH) and the City/County Association of Governments of San Mateo County (C/CAG), 21 Elements has successfully brought together twenty-one unique communities and assisted them as they work to provide a growing and changing population with a variety of housing choices.