California Code, Code of Civil Procedure - CCP § 1203.56

The lien provided for in this chapter arises on the date of the furnishing of the first item of material or services or the date of performance of the first labor for which a lien is claimed under the provisions of this chapter. Upon compliance with the provisions of Section 1203.58, such lien shall be preferred to all other titles, charges, liens or encumbrances which may attach to or upon any of the property upon which a lien is given by this chapter subsequent to the date the lien herein provided for arises.