Mich. Comp. Laws § 41.279
At the time of hearing objections to the proposed improvement, the commissioners shall finally determine the special assessment district to be assessed for benefits on the construction of the proposed improvement, and shall not assess any lands therefor not included in the district. The determination shall be announced at the conclusion of the hearing. If at any time error is discovered in the district as so determined, before the special assessment roll has been finally approved by the commissioners and if in the judgment of the commissioners further lands should be brought within such assessment district, they may give notice of a new hearing as to the limits of such assessment district, and bring in additional lands as provided in the first instance. The commissioners shall also then and there determine the number of installments, if any, in which the money therefor shall be raised, which shall not be more than 10 annual installments. The determination as to the number of installments in which the money for the improvements shall be raised, may be altered, subject to the limitations in section 13, after notice and hearing thereon given and conducted in the manner hereinbefore provided.
MCL 41.279