Ohio Revised Code Title LV. Roads Highways Bridges § 5555.08

A board of county commissioners may defer its consideration, adjustment, approval, and confirmation of the estimated assessments until all questions of compensation and damages have been determined and until the contract for the improvement has been let and the exact cost of the improvement, including compensation and damages, has been ascertained. If a board approves and confirms the estimated assessments, as made by the county engineer, or as modified and changed by the board, under authority of section 5555.07 of the Revised Code and prior to the determination of the exact cost of the improvement, such board shall, after all questions of compensation and damages have been determined, and after the improvement has been completed, cause the exact cost thereof to be determined. The board shall thereupon certify to the county auditor the estimated cost and the actual cost, including all compensation and damages allowed, and the auditor shall thereupon correct and adjust the assessment against each parcel of real estate, so that the total amount to be paid by the owner of each such parcel is based upon the actual cost of the improvement, including compensation and damages.