California Code, Civil Code - CIV § 798.44

(a) The management of a park that does not permit mobilehome owners or park residents to purchase liquefied petroleum gas for use in the mobilehome park from someone other than the mobilehome park management shall not sell liquefied petroleum gas to mobilehome owners and residents within the park at a cost which exceeds 110 percent of the actual price paid by the management of the park for liquefied petroleum gas.

(b) The management of a park shall post in a visible location the actual price paid by management for liquefied petroleum gas sold pursuant to subdivision (a).

(c) This section shall apply only to mobilehome parks regulated under the Mobilehome Residency Law.  This section shall not apply to recreational vehicle parks, as defined in Section 18215 of the Health and Safety Code, which exclusively serve recreational vehicles, as defined in Section 18010 of the Health and Safety Code.

(d) Nothing in this section is intended to abrogate any rights a mobilehome park owner may have under Section 798.31 of the Civil Code.

(e) In addition to a mobilehome park described in subdivision (a), the requirements of subdivisions (a) and (b) shall apply to a mobilehome park where requirements of federal, state, or local law or regulation, including, but not limited to, requirements for setbacks between mobilehomes, prohibit homeowners or residents from installing their own liquefied petroleum gas supply tanks, notwithstanding that the management of the mobilehome park permits mobilehome owners and park residents to buy their own liquefied petroleum gas.