It is illegal to store your own stuff in your own garage
According to Chapter 6 of the San Francisco Housing Code, “Private and public storage garages in apartment houses and hotels shall be used only for storage of automobiles.” Failing to comply with the law can lead to fines of up to $500.
[Added by Ord. 399-89, App. 11/6/89; amended by Ord. 161-92, App. 6/4/92; Ord. 350-95, App. 11/3/95; Ord. 256-07, App. 11/6/07]
(a) No automobile or other motor vehicle shall occupy any portion of an apartment house or hotel except in a garage which meets the requirements of the Building Code and other provisions of the Municipal Code.
(b) Use. Private and public storage garages in apartment houses and hotels shall be used only for storage of automobiles.
(c) Separation. See Section 406.1 of the Building Code. When approved, existing separations in existing buildings may be acceptable.