California Code, Civil Code - CIV § 798.49

(a) Except as provided in subdivision (d), the local agency of any city, including a charter city, county, or city and county, which administers an ordinance, rule, regulation, or initiative measure that establishes a maximum amount that management may charge a tenant for rent shall permit the management to separately charge a homeowner for any of the following:

(b) If management has charged the homeowner for a fee, assessment, or other charge specified in subdivision (a) that was increased or first imposed on or after January 1, 1993, and the fee, assessment, or other charge is decreased or eliminated thereafter, the charge to the homeowner shall be decreased or eliminated accordingly.

(c) The amount of the fee, assessment or other charges authorized by subdivision (a) shall be separately stated on any billing to the homeowner.  Any change in the amount of the fee, assessment, or other charges that are separately billed pursuant to subdivision (a) shall be considered when determining any rental adjustment under the local ordinance.

(d) This section shall not apply to any of the following:

(e) 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.