California Code, Streets and Highways Code - SHC § 9539

Except as provided in Section 9548, the lien of the reassessments shall be given superiority and priority as of the date that the original assessments became a lien upon the property reassessed.The lien of unpaid installments of the assessments originally levied and the penalties and interest thereon, and the lien of any remaining portion of the original assessments not securing refunded bonds, are equal in priority to the lien of the reassessments.