Yes. A licensee involved in the transfer of residential one-to-four unit estate real property interests (including mobile homes) is required to conduct a reasonably competent and diligent visual inspection of all accessible areas of the property and to disclose to prospective buyers all facts materially affecting the value or desirability of the property that the inspection reveals (Cal. Civ. Code § 2079(a)). Although not required by the statute, the disclosure should be made in writing.