Mich. Comp. Laws § 211.765
Upon receipt of the affidavit, the local assessing officer shall promptly examine it to determine if the applicant meets the requirements of this act and shall make an inspection of the property and property records and conduct an investigation and survey as it deems necessary. An applicant shall not be compelled to supply information not reasonably essential to a proper determination of the eligibility of the owner and the homestead for the relief provided under this act. The local assessing officer shall promptly make its decision with respect to an application under this section and shall notify the applicant of its decision not later than the due date for a special assessment involved in the application. A decision of the local assessing officer shall be final except as otherwise provided pursuant to the constitution.
MCL 211.765