California Code, Health and Safety Code - HSC § 7904

After the removal of all human remains interred in any part or the whole of the cemetery lands, the cemetery authority may file for record in the office of the county recorder of the county or city and county in which the lands are situated a written declaration reciting that all human remains have been removed from the lands described in the declaration.

The declaration shall be acknowledged in the manner of the acknowledgment of deeds to real property by the president and secretary, or other corresponding officers of the cemetery authority, or by the person owning or controlling the cemetery lands, and thereafter any deed, mortgage, or other conveyance of any part of such lands is conclusive evidence in favor of any grantee or mortgagee named in it, and his successor or assigns, of the fact of the complete removal of all human remains therefrom.