I wonder how a landlord in SF would feel about using a residential address as a shared office: much more affordable than downtown real estate and maybe the bonus of a garden for the summer. I expect that happens a lot unofficially..
Uh...residential real estate is hardly "much more affordable" in SF. In fact, office space in soma is likely still cheaper than residential here (not sure why you'd want to be downtown). Also, probably illegal if not zoned for commercial
Landlords don't care but the neighbors and the city might