Every ordinance or resolution appropriating money, levying any tax or assessment, creating any financial liability of the City, authorizing the issuance of bonds of the City, awarding or approving any contract for payment of money, ordering any condemnation of private property, ordering the making of any public improvement, or ordering the vacating of any street, alley, boulevard, or other public thoroughfare shall require a vote of at least two-thirds of the members elect of the Council.