@SFBayDuck
even though we lived in marin (larkspur and novato) for a bit, i never really developed a "third place" for the area as most friends were south.
I had Brew Co for a bit, when I was living in Greenbrae and taking the ferry into The City every day. Once or twice a week I'd stop there, sit at the bar and drink a beer, place a to-go dinner order and drink another beer, then bring the food home. I got to know a few of the bartenders well enough that we hung out socially a few times away from there.
In Novato we had Mantra, the wine tasting room that opened up downtown, and Las Guitarras. I'd work from one of those spots on occasion on a Thursday or Friday afternoon, and got to know the owners/managers/staff at each. At Las Guitarras the waiter would give me a look, I'd nod, and he'd bring me my standard drink order.
But, like you, most of my friends were either still in SF or had moved away from the Bay, so these were local spots that I frequented but wasn't really meeting friends there too often.