Cal. Sts. & High. Code § 6423

If a lot or parcel of land is described upon the assessment and diagram by its number or block, or both, and is also designated by its number or block, or both, upon the official map of the city, or upon any map on file in the office of the county recorder of the county in which the lot or parcel of land is situated, it shall be a sufficient description of the lot or parcel of land in the bond to designate it by the number or block, or both, as it appears on the official or recorded map.