No idea about SF, but a few years ago a group painted most of the Rolling security shutters in the business in a street near my home in Buenos Aires https://www.google.com/maps/place/Uruguay+224,+C1015ABF+ABF,...

Most were nice, and some of them still survive, but a lot seem to be over painted. (It would be nice to see a image at night or Sunday, when most business are closed. Some may be still there but rolled up while the business is open.)

Anyway, I don't expect a formal paperwork, just a handshake an an oral agreement.