Cal. Sts. & Hy. Code § 2804.1
The provisions of clause (3) of Section 2804 shall not apply to proceedings for the financing and improvement of streets and easements initiated under a contract entered into, or proposed to be entered into, between a subdivider and a city, city and county, or county pursuant to Section 66462 of the Government Code, unless the subdivider shall submit written evidence satisfactory to the legislative body and the legislative body shall find and determine that the total estimated amount of the proposed assessment will not exceed 75 percent of the estimated fair market value of the land proposed to be assessed after the proposed public improvements shall have been constructed. The finding and determination of the legislative body shall be final and conclusive in the absence of fraud.
Ca. Sts. and High. Code § 2804.1