Mich. Comp. Laws § 207.5b

Sec. 5b. (1) As used in this act, "taxable value" is that value determined in the same manner taxable value is determined under section 27a of the general property tax act, Act No. 206 of the Public Acts of 1893, being section 211.27a of the Michigan Compiled Laws. (2) All property of a company subject to taxation under this act shall be considered 1 parcel in determining the taxable value of that company's property.