Cal. PROB § 201

(a) Proceedings under this chapter shall be commenced in the superior court of the county of which the decedent was a resident at the time of death or in the superior court of any county in which the property is located. (b) Proceedings under this chapter shall be commenced by filing a petition that sets forth all of the following information: (1) The jurisdictional facts. (2) A particular description of the affected property and of the interest of the petitioner in the property.