Cal. Gov. Code § 53939

If property acquired in a transaction is part of a larger parcel encumbered by a lien that secures a special assessment or a bond representing the special assessment and there is no applicable statutory procedure for segregation and apportionment of the lien, any party to the transaction may, within one year after completion of the transaction, apply to the superior court of the county in which the property or a portion thereof is located to, and the court may segregate and apportion the lien among the parties to the transaction.