Sts. & Hy. Code, § 5630

Whenever the property fronting on a sidewalk required to be maintained and repaired pursuant to the provisions of this chapter lies within one city or unincorporated territory of a county, and the sidewalk required to be so maintained and repaired lies within another city or unincorporated territory of a county, the superintendent of streets of the city or county having jurisdiction over the sidewalk shall have full authority to serve notices to repair and do all work contemplated by Articles 2 and 3 of this chapter, notwithstanding the fact that the property fronting on the sidewalk lies within another city or unincorporated territory of a county. The legislative body of the city or county within which the sidewalk has been repaired pursuant to the provisions of this chapter shall have jurisdiction to levy an assessment to pay the cost of any such sidewalk repairs against the parcel of property fronting on said sidewalk, notwithstanding the fact that said property lies within another city or unincorporated territory of a county and said assessment shall be a lien on said property for the amount thereof until the assessment and all interest thereon is paid or until it is discharged of record.

The provisions of Sections 5628 and 5629 of this code shall be applicable to the collection and enforcement of all liens levied pursuant to the provisions of this section and the amount so collected shall be paid to the treasurer of the city or county as the case may be which conducted the proceedings.