1002 N 13th Street at the intersections of Fort and O'Farrell (all 3 come together in a five way intersection).
Unlimited free parking on 12th Street and part of O'Farrell Street
1 hour free parking on O'Farrell Street and 13th Street
1 1/2 hour free parking on O'Farrell between 12th and 11th
To take a bus, check the routes and schedules here.