Mich. Comp. Laws § 207.712a

Sec. 12a. (1) If a facility was subject to a technology park facilities exemption certificate on December 31, 2012, notwithstanding any other provision of this act to the contrary, that portion of the facility that is eligible manufacturing personal property shall remain subject to the technology park facilities tax and shall remain exempt from ad valorem property taxes as provided in section 9 until that eligible manufacturing personal property would otherwise be exempt from the collection of taxes under section 9m, 9n, or 9o of the general property tax act, 1893 PA 206, MCL 211.9m, 211.9n, and 211.9o. (2) As used in this subsection, "eligible manufacturing personal property" means that term as defined in section 9m of the general property tax act, 1893 PA 206, MCL 211.9m.