THE CACHE IS NOT AT THE POSTED COORDINATES.
To get the final cords, go to the plaque in this neat plaza. On the plaque, find the date when the plaza was dedicated. This is AB/CD/EFGH.
the cache is at
N 41° (CD + 37) .7A7′ W 87° 58. (EFGH - 1,275)′
happy caching!