I’m interested in theory, but in practice I am attached to living in SF proper that may be hard to overcome.
I’ll mention that in South Bay there are housing complexes that have multiple nearly-adjacent units in shared space, and it might work well to just pick such a complex and progressively have like-minded people take over more and more of it. Noticeably less awesome, but also noticeably easier.
I believe this is what happened with Godric’s Hollow—a four unit building turned, one by one, into a four unit rationalist building.
I think this was helped along substantially by personal acquaintance with and HPMOR fandom of the landlord, which seems hard to replicate on purpose.
My understanding is that most landlords want the friends of their good tenants to move in, because they’ll likely be equally good and also living near friends will make people less likely to move out.
Something like this also happened with Event Horizon, though the metamorphosis is not yet complete...
It looks like it’s finishing soon, though.