Section 58.15
If at, or prior to, the final confirmation of any special assessments, the owners of privately owned real property to be assessed for more than 50 percent of the cost of an improvement, or in the case of paving or similar improvements the owners of more than 50 percent of the frontage to be assessed for any such improvements, shall object in writing to the proposed improvement, the improvement shall not be made by proceedings delineated by this chapter without a two-thirds vote of the members-elect of the council, provided that this section shall not apply to sidewalk construction. (Comp. Ords. 1987, § 12.414)