A few years ago I lived in a redwood shack in the backyard of 3805 Clarke St, Oakland. I heard from the neighbors that it was built as temporary housing in Golden Gate Park after the 1906 earthquake, and later moved to Oakland. But I didn't realize until coming across this site today, how few of these shacks are known to exist! And none listed in Oakland.
It was set up like a duplex, with perhaps two shacks and some additional construction joining them together in a U shape (each side a separate apartment).