The provisions of this Article shall not be deemed in any way to affect any of the matters provided for in Article 6 of this Chapter for the improvement of streets by public contract and assessment of the cost thereof against private property.
This Article, however, shall not in any manner be held to affect any private contract heretofore in force and effect in pursuance of the provisions of Ordinance No. 7169 (New Series) and ordinance amendatory thereof, which provisions shall be deemed applicable until the completion of every such contract.