Contact Lightwaves and see if they are offering access to their b/w facility - I have this vague recollection from the last time I had them process some color neg film (which I wouldn't do again, long story) that they had a black and white darkroom facility that they rented. They're in the middle of the city sort of SoMa-ish, downtown of the Mission/Castro area.
Interesting. Didn't know this. I know where they are. I'll check it out. Thanks.