Mich. Comp. Laws § 211.11

Sec. 11. All corporate real and tangible personal property, except where some other provision is made by law, shall be assessed to the corporation as to a natural person, in the name of the corporation. The place where its office is located in its articles of incorporation shall be deemed its residence if its business is actually transacted at such office; but if it shall establish its principal office in any other place than the place named in its articles of incorporation, then the place where it transacts its principal business shall be deemed its residence for all the purposes of this act. If there is no principal office in this state, then at the place in this state where such corporation or agent transacts business. The property of corporations paying specific taxes shall be exempt as to the property covered by such taxation, except when otherwise provided by law. All other real and tangible personal property of such corporation shall be taxed under this act.