I'm on the other side of the bay and don't have contacts there. I chimed in because I do related work, not specialized, but general, such as here.
It's tough to make a mutually satisfactory arrangement in S.F. to do work, what with travel, tolls, and pita parking.
I tend to think AT&T would be one of your better options or you could browse Yelp or the like for local contractors. Just maybe, Eric Youngblood, an electrical contractor who lives on this side but ranges pretty far afield, could be a resource for you:
*Join and IM me for more details.