California Code, Civil Code - CIV § 1102.6a

(a) On and after July 1, 1990, any city or county may elect to require disclosures on the form set forth in subdivision (b) in addition to those disclosures required by Section 1102.6.  However, this section does not affect or limit the authority of a city or county to require disclosures on a different disclosure form in connection with transactions subject to this article pursuant to an ordinance adopted prior to July 1, 1990.  An ordinance like this adopted prior to July 1, 1990, may be amended thereafter to revise the disclosure requirements of the ordinance, in the discretion of the city council or county board of supervisors.

(b) Disclosures required pursuant to this section pertaining to the property proposed to be sold, shall be set forth in, and shall be made on a copy of, the following disclosure form:

(c) This section does not preclude the use of addenda to the form specified in subdivision (b) to facilitate the required disclosures.  This section does not preclude a city or county from using the disclosure form specified in subdivision (b) for a purpose other than that specified in this section.