We Are attempting the impossible here. More choices would be more building; more building would be bad. Mill Valley is what it is. None is attracted to it bit low cost. It's its SIZE that attracts them, and which they buy into. More houses would undermine what they have bought.
People cannot make a community of a habitation exceeding certain numbers. Small is beautiful. Failure to make real communities produces chaos. 20,000 is about the ideal maximum population. Thereafter expansion causes an exponential rise in social problems,with which provision for extra social services, however great, can never catch up.

Mill Valley is quite big enough as it is. More people or more jobs or more houses will be less happiness, less comfort, less relationship between people.