(5) The pro rata amount, based on the total number of spaces in the park, of any fee, assessment, or other charge first imposed pursuant to any state or locally mandated program relating to housing contained in the Health and Safety Code on or after January 1, 2013, on any parcel upon which the mobilehome park is located, and any increase in that fee, assessment, or charge.
(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:
(1) Those fees, assessments, or charges imposed pursuant to the Mobilehome Parks Act (Part 2.1 (commencing with Section 18200) of Division 13 of the Health and Safety Code), unless specifically authorized by Section 18502 of the Health and Safety Code.
(2) Those costs that are imposed on management by a court pursuant to Section 798.42.
(3) Any fee or other exaction imposed upon management for the specific purpose of defraying the cost of administration of any ordinance, rule, regulation, or initiative measure that establishes a maximum amount that management may charge a tenant for rent.
(4) Any tax imposed upon the property by a city, including a charter city, county, or city and county.
(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.
(f) Nothing in this section shall require management to refund, reduce, or otherwise change any fee or charge billed by management to a homeowner as of December 31, 2012.