Cal. Government Code § 960.2

Notwithstanding any provision of law to the contrary, service of process in an action or proceeding against a public agency may be made in the manner provided in Section 960.3 if, during the 10 days immediately following the commencement of the action or proceeding, any of the following apply: (a) No statement pertaining to the public agency is on file, or is placed on file, in the Registry of Public Agencies in the office of the Secretary of State and of the county clerk of each county in which the public agency then maintains an office, as required by Section 53051. (b) A statement or amended statement pertaining to the public agency is on file, or is placed on file, in the Registry of Public Agencies in the office of the Secretary of State and of the county clerk of each county in which the public agency then maintains an office, but the information contained therein is so inaccurate or incomplete that it does not substantially conform to the requirements of Section 53051. (c) A statement or amended statement pertaining to the public agency is on file, or is placed on file, in the Registry of Public Agencies in the office of the Secretary of State and of the county clerk of each county in which the public agency then maintains an office, but neither the governing body nor any officer or agent of the public agency upon whom personal service of process constitutes service upon the public agency can thereafter, with due diligence, be personally served at the address or addresses set forth in the statement.