Mich. Comp. Laws § 211.7r
The real estate and building of a clinic erected, financed, occupied, and operated by a nonprofit corporation or by the trustees of health and welfare funds is exempt from taxation under this act, if the funds of the corporation or the trustees are derived solely from payments and contributions under the terms of collective bargaining agreements between employers and representatives of employees for whose use the clinic is maintained. The real estate with the buildings and other property located on the real estate on that acreage, owned and occupied by a nonprofit trust and used for hospital or public health purposes is exempt from taxation under this act, but not including excess acreage not actively utilized for hospital or public health purposes and real estate and dwellings located on that acreage used for dwelling purposes for resident physicians and their families.
MCL 211.7r