Close-in marin, so Sausalito, Marin city, Larkspur, Corte Madera, San Rafael, and the 'Sir Francis Drake corridor' (San Anselmo, Kentfield, etc) are very walkable. I don't really understand the consternation about bart, the bus service is reliable, and both the marin transit and golden gate transit are the gold standard in american public bus service IMO. Clean, WIFI, nice seats...
My wife and I frequently took public buses into San Francisco for date nights, and would come back late (last bus arrives past midnight, IIRC).
> Marin county famously blocked BART from expanding north in order to keep out the “riff-raff”.
Really good idea. Marin is a lovely place, and BART is famously terrible. Until the other cities in the bay area manage to enforce some semblance of law, I don't blame Marin for wanting nothing to do with them.
> Zooming in near the walkable areas of San Rafael, Google Maps instantly highlights many car oriented businesses like at 2nd street and D street where we see a Chevron gas station, an Arco gas station, and an O’Reilly Auto Parts store all on one corner.
Living in a walkable area does not imply removing every reminder of a car LOL.
> They famously drew a circle around the city and said development can’t go outside of that area which forced a certain density and allowed transit to be planned well in advance.
This is not why Portland developed this way. There are many places within the metro area that have not. Portland developed this way because it started as many small towns that merged, similar to Marin. The difference between PDX and Marin is that PDX is today much denser, but the basic layout is the same.
I'll also note that you're getting really bogged down with the fact Marin has no public rapid train transit, as if thats necessary for walkability. Marin is walkable because there are so many downtowns, if you live nearby, you just go to your downtown, and the downtowns it does have are spectacular. Downtown San Anselmo, Fairfax, etc are IMO the definition of an American downtown. They are so charming it's painful.