Cal. Sts. & High. Code § 9254

In the event that reassessment collections are made by county officials for a city the county auditor shall at the close of the tax collecting season promptly render to the city auditor a detailed report showing the amounts of installments, interest, penalties, and percentages of reassessments so collected on each proceeding and from what property collected. The report shall also include a statement of the percentages retained for the expenses of making such collections.