California Code, Streets and Highways Code - SHC § 8040

Any person owning any real property fronting upon any street or portion thereof on which such change or modification of grade is proposed to be made, may, within 30 days after the first publication of the notice of the passage of the ordinance of intention, or within 30 days after the first posting thereof if no publication thereof is made, file with the clerk of the city council a written protest against such proposed change or modification of grade.