1. The city council of any city coming within the purview of sections 88.863 to 88.913 may, when deemed necessary or expedient, divide said city or any portion thereof into sidewalk districts, by ordinance, and may adopt plans and specifications for the building of all sidewalks within said district or districts, and may advertise for bids and award a contract to the lowest and best responsible bidder for the building and construction of all sidewalks which may be ordered built by the city council within said district for the next ensuing year. Said advertisement for bids shall be published in at least one issue of a weekly newspaper or at least two consecutive issues of a daily newspaper published in said city, or if there be no newspaper published in said city, may be published in any newspaper within such county in which said city is located.

2. And before the bids are opened or any contract let, the city engineer, or other proper person designated by the city council, by ordinance, shall prepare and submit to the city council an estimate of the cost of said sidewalk, including approaches, grading and parking, material, etc., which estimate shall be the price per cubic yard or square yard, as the case may be, for the finished improvement; and no contract shall be let for a price in excess of said estimate. And the cost of all sidewalks, approaches, parking or other improvement herein contemplated shall be, on their completion, levied as a special assessment against the lot, tract or parcel of ground along and in front of which said improvement is made, as provided in section 88.890.