Mich. Admin. Code R. 408.30412
Rule 412. Sections 111.2 and 111.2.1 of the code are amended to read as follows:
A change of occupancy shall not be made in any building unless that building complies with the requirements of the International Building Code for the use or occupancy. Changes of occupancy in a building or portion thereof shall be such that the existing building is not less compliant with the provisions of the code than the existing building or structure was before the change. Subject to the approval of the code official, changes of occupancy shall be permitted without complying with all the requirements of the code for the new occupancy, provided that the new occupancy is less hazardous, based on life and fire risk, than the existing occupancy.
0000- Compliance shall be only as necessary to meet the specific provisions and is not intended to require the entire building be brought into compliance.
Mich. Admin. Code R. 408.30412