California Code, Revenue and Taxation Code - RTC § 11935

(a) Any ordinance adopted pursuant to this part may include an administrative appeal process for resolution of disputes related to the documentary transfer tax.

(b) Whether the amount of documentary transfer tax is determined by an administrative appeal process or established by a court of law, the value of the property established for purposes of determining the amount of documentary transfer tax due shall not be binding on the determination of the value of that property for property tax purposes by the county assessor, by an assessment appeals board, or by a court of law reviewing property tax values established by an assessment appeals board.