Mich. Comp. Laws § 125.2478

Sec. 28. If a parcel of land is divided after a special assessment on the land is confirmed, and before the special assessment is collected, the authority board may apportion the uncollected amounts between the several divisions of the parcel. Upon confirmation by the authority board, the apportionment is conclusive upon all parties. However, if the interested parties do not agree in writing to the apportionment, then before the confirmation, notice of hearing shall be given to the interested parties, by personal service as provided in section 20 for an original assessment roll.