California Code, Code of Civil Procedure - CCP § 395.1

Except as otherwise provided in Section 17005 of the Probate Code pertaining to trustees, when a defendant is sued in an official or representative capacity as executor, administrator, guardian, conservator, or trustee on a claim for the payment of money or for the recovery of personal property, the county which has jurisdiction of the estate which the defendant represents shall be the proper county for the trial of the action.