California Code, Civil Code - CIV § 798.32

(a) A homeowner shall not be charged a fee for services actually rendered which are not listed in the rental agreement unless he or she has been given written notice thereof by the management, at least 60 days before imposition of the charge.

(b) Those fees and charges specified in subdivision (a) shall be separately stated on any monthly or other periodic billing to the homeowner.  If the fee or charge has a limited duration or is amortized for a specified period, the expiration date shall be stated on the initial notice and each subsequent billing to the homeowner while the fee or charge is billed to the homeowner.