CA Civ Code Section 8450

(a)

A lien under this chapter, other than a lien provided for in Section 8402, has priority over a lien, mortgage, deed of trust, or other encumbrance on the work of improvement or the real property on which the work of improvement is situated, that (1) attaches after commencement of the work of improvement or (2) was unrecorded at the commencement of the work of improvement and of which the claimant had no notice.

(b)

Subdivision (a) is subject to the exception provided for in Section 8452.