Unfortunately, most tenants will not sign anything after they have gotten inside and been a tenant for a while.
Under SF Admin Code 37.9, the landlord used to be able to change the lease terms with a served notice pursuant to an addendum code; but in tenant favored San Francisco, this is no longer the case and landlords need signatures from tenants to change anything (good luck with that!).
In San Francisco, there are a lot of older landlords and they will retire and leave their property to beneficiaries; these beneficiaries will be up for a rude awakening as to the multitude of Renters Laws that is thicker than Two Yellow Pages and the most regulated in the Entire Nation.
Peter T. Chin Realtor #01866332 415-863-7500