California Code, Government Code - GOV § 66412.6

(a) For purposes of this division or of a local ordinance enacted pursuant thereto, any parcel created prior to March 4, 1972, shall be conclusively presumed to have been lawfully created if the parcel resulted from a division of land in which fewer than five parcels were created and if at the time of the creation of the parcel, there was no local ordinance in effect which regulated divisions of land creating fewer than five parcels.

(b) For purposes of this division or of a local ordinance enacted pursuant thereto, any parcel created prior to March 4, 1972, shall be conclusively presumed to have been lawfully created if any subsequent purchaser acquired that parcel for valuable consideration without actual or constructive knowledge of a violation of this division or the local ordinance. Owners of parcels or units of land affected by the provisions of this subdivision shall be required to obtain a certificate of compliance or a conditional certificate of compliance pursuant to Section 66499.35 prior to obtaining a permit or other grant of approval for development of the parcel or unit of land. For purposes of determining whether the parcel or unit of land complies with the provisions of this division and of local ordinances enacted pursuant thereto, as required pursuant to subdivision (a) of Section 66499.35, the presumption declared in this subdivision shall not be operative.

(c) This section shall become operative January 1, 1995.