Council decision after the hearing

After the hearing provided in section 12-10, the council shall consider any protests, objections or suggestions which may have been made or filed and whether sufficient valid protests have been filed to compel it to abandon any part or all of the proposed improvement. If the council still has jurisdiction to continue it shall then proceed, determining whether or not the proposed improvement shall be made as proposed, or made with modifications or with changes in the total estimated costs or costs per assessment unit of the improvements set forth in the resolution adopted pursuant to section 12-10(c). In the latter event, modifications or changes may be made without again giving notice of a hearing as provided in section 12-10; provided that such modifications or changes shall not materially alter the general character or plan so advertised or increase the total estimated costs or costs per assessment unit of the improvements by more than ten percent or as otherwise set forth in the resolution pursuant to section 12-10(c). No modification of or change in the plans and estimates furnished by the responsible department or cooperating department shall be made without the consent of such department.