Sts. & Hy. Code, § 5615

If the repair is not commenced and prosecuted to completion with due diligence, as required by the notice, the superintendent of streets shall forthwith repair the sidewalk. Upon the written request of the owner of the property facing the sidewalk so out of repair, as ascertained from the last equalized assessment roll of the city, or as shown in the records of the office of the clerk, the superintendent may repair any other portion of the sidewalk fronting on the property that is designated by the owner. The superintendent shall have power to prescribe the form of the written request. The cost of repair work done by request pursuant to this section shall be a part of the cost of repairs for which, pursuant to this chapter, subsequent notices are given, hearings held and assessment and collection procedures are conducted.