Mich. Comp. Laws § 205.94m

Sec. 4m. (1) The tax levied under this act does not apply to tangible personal property acquired by a person engaged in the business of constructing, altering, repairing, or improving real estate for others if the property is to be affixed to or made a structural part of a sanctuary. (2) As used in this section: (a) "Regularly organized church or house of religious worship" means a religious organization qualified under section 501(c)(3) of the internal revenue code of 1986. (b) "Sanctuary" means only that portion of a building that is owned and occupied by a regularly organized church or house of religious worship that is used predominantly and regularly for public worship. Sanctuary includes a sanctuary to be constructed that will be owned and occupied by a regularly organized church or house of religious worship and that will be used predominantly and regularly for public worship.