Cal. Civ. Code § 1940.1

(a) No person may require an occupant of a residential hotel, as defined in Section 50519 of the Health and Safety Code, to move, or to check out and reregister, before the expiration of 30 days occupancy if a purpose is to have that occupant maintain transient occupancy status pursuant to paragraph (1) of subdivision (b) of Section 1940. Evidence that an occupant was required to check out and reregister shall create a rebuttable presumption, which shall affect solely the burden of producing evidence, of the purpose referred to in this
subdivision.
(b) In addition to any remedies provided by local ordinance, any violation of subdivision (a) is punishable by a civil penalty of five hundred dollars ($500). In any action brought pursuant to this section, the prevailing party shall be entitled to reasonable attorney’s fees.
(c) Nothing in this section shall prevent a local governing body from establishing inspection authority or reporting or recordkeeping requirements to ensure compliance with this section.