At the posted coordinates you will find a cover just off the sidewalk. On this cover are two large words in the middle.
Convert the last letter of the second word to a number (A=1, B=2, etc) and call it X. Let Y and Z both equal 0.
Add XYZ to 067 to get the last three digits to the North coordinates.
You will find the final at: N 42° 44.(XYZ + 067)' W 83° 22.796'
Good luck and have fun