Mich. Comp. Laws § 213.303

Sec. 3. The judicial determination of relative necessity hereby required shall be obtained in the same manner as is prescribed for a declaration of rights under Act No. 36 of the Public Acts of 1929, being sections 691.501 to 691.507 of the Compiled Laws of 1948, and shall be a condition precedent to the commencement hereafter of any other judicial proceedings for the taking of any such property.