To get to the final, go to the posted coords. There you will find a picnic table. There is a company name carved into the top of the table.
If the name is:
Peterson Manufacturing - go to n42 51.320 w085 41.685
Landscape Architecture - go to n42 51.325 w085 41.900
Bata Plastics Inc - go to n42 51.191 w085 42.220