Does SF have a code that allows driveway access for painting adjacent properties?

We need to paint the facade of our SF home, need access to neighbor's driveway. Elderly neighbor won't accept our hold harmless agreement even though painter has added them to liability insurance. They want us to pay their attorney fees to review the documents and have promised to stop any work. We already paid our attorney to prepare the hold harmless agreeement. We went through this 2 years ago and ended up not doing maintenance because they were never satisfied. We really need to do the work now. How can we proceed?