California Code, Revenue and Taxation Code - RTC § 2927.7

Notwithstanding any other provision of law, if the tax collector can determine that an assessee on the unsecured roll has a recorded, undivided interest in the property assessed, the tax collector may, at the assessee's request, accept pro rata payment of taxes due. The assessee shall pay to the tax collector an amount equal to the percentage of the total property comprised by the assessee's undivided interest assessed as a pro rata payment to the total amount due at the time of payment. Upon proper payment, the assessee shall be discharged from the tax lien.