Mich. Comp. Laws § 124.358

Sec. 8. The real and personal property, owned by an authority and located within the service area, shall be exempt from all taxes levied by the state and by a political subdivision, except special assessments for municipal services if the property is located outside the corporate boundaries of the political subdivision by which the authority is incorporated. The real and personal property, owned by an authority and located outside the corporate boundaries of the political subdivision by which the authority is incorporated, may be exempted from special assessments for municipal services upon resolution by the governing body of the political subdivision.