There is an office within Contra Costa that can help seniors with housing issues. It is not all that easy to find. Most of the info on line says to call an 800 number from within Contra Costa County. My advice is NEVER call that number. You will wait over an hour and then get someone that cannot help you. Call on a cell phone to 925-229-8434. Then you get a real person actually in Contra Costa County. You may also reach a social worker at this number.
It is also kind of hard to find their website, which is ehsd.org (Contra Costa Employment and Human Services).
Among other things, they can send you a list of “affordable apartment complexes”.
And I am always glad to help point someone in the right direction.