For Current Home Sharing check the San Mateo County website:

Human Investment Program (HIP)

The misson of HIP Housing's mission is to invest in human potential by improving the housing and lives of people in our community. HIP Housing enables people with special needs, either from income or circumstance, to live independent, self-sufficient lives in decent, safe, low-cost homes. The Home Sharing Program helps match individuals seeking housing with people who have a room or Accessory Dwelling Unit (ADU) to rent.

Home Sharing - FAQ

Housing Available and Housing Needs Information: