There are no laws against fraternity or sorority housing in the City and County of San Francisco.
As far as I know, there are no "official" fraternity or sorority houses at either San Francisco State or University of San Francisco. The main reasons being the cost to buy/rent, the cost to build, and the lack of availability land to build within San Francisco.
ETA: Also, no houses at the Academy of Art University. But I think you may already know that.
