Lazyweb Help Wanted: Public Spaces for Meetings

I am looking for ideas to explore about publicly available spaces for discussion or support groups to hold meetings in the Bay Area, preferably in the Berkeley/Oakland area or in San Francisco.

This was a sticking point for a project that has been on the back burner for more than a year; and I've been thinking about another project for which it is a key issue. I'm tired of it being a sticking point, and I want to get good information.

Desired features:

• Convenient to reliable and timely public transportation, such as BART, Muni, A/C Transit, etc.
  
• Easily accessible for people with disabilities.
  
• Private and quiet, so meetings aren't interrupted or disrupted by members of the general public.
  
• Low in cost — the cheaper the better; free is ideal. I want neither to carry the cost of renting space myself nor have to dun meeting participants for more than a buck or two to cover expenses.
  
• (less important than the others) Spacious enough to allow participants to stand up and move around as well as sit.
  

My own living room would do for a start; but while it's free, private, and close to good transit, it dramatically flunks on disability access, and it doesn't offer much room for participants to move around. This is the case with just about any private home: unless they are specifically built with accessibility in mind, they generally aren't accesible.

Hotel meeting rooms fit every criterion except cost. What about restaurants' banquet rooms? Churches, synagogues, etc.? Masonic lodges? Service organizations, such as the Lions', Rotarians, etc.? Schools? Community centers? Some sort of venue that I'm overlooking?

I am eager to receive the advice of anyone reading this with relevant experience in the area. Thanks in advance.