After the contract has been awarded and at such time as the council shall determine, the engineer shall prepare a duly certified report to the council showing in detail the total cost and expenses of the improvements and the dollar amounts of the same payable from assessments and from other sources. The report shall also contain a form of assessment roll numbering each assessment, giving the name, if known, of the owner of each lot or parcel of property assessed, and showing the amount chargeable to each lot or parcel of property according to the method of assessment originally contemplated by the council subject to any variations therefrom as a result of the engineer’s recommendation that benefits to be received by any lot or parcel of property warrant such a variation from the method chosen. Each lot or parcel of property shall be described with sufficient clearness to identify it, and if the engineer recommends any variations from the contemplated method of assessment, those variations shall be pointed out and the reasons for the same shall be given in the report. No assessment for water or sewer purposes shall be levied against any property of any public utility unless the latter shall agree to the same by filing a written consent in the office of the clerk of the municipality; and in the event that a local improvement district constructs water and sewer improvements as well as other improvements the engineer shall assess public utilities only for the amount of the total cost and expenses which the engineer finds to be attributable to such other improvements if no such consent has been given.