Hell, it’s not even just the bay area; Seattle has two explicitly-rationalist-group-houses and plenty of other people who live in more “normal” situations but with other rationalists (I found my current flatmate, when my old one moved out, through the community). Certainly the bay area rationalist community is large and this sort of living situation is far from universal, but I’ve certainly heard of several even though I’ve never actually visited any.
Hell, it’s not even just the bay area; Seattle has two explicitly-rationalist-group-houses and plenty of other people who live in more “normal” situations but with other rationalists (I found my current flatmate, when my old one moved out, through the community). Certainly the bay area rationalist community is large and this sort of living situation is far from universal, but I’ve certainly heard of several even though I’ve never actually visited any.