The posted coordinates take you to an unusual structure at an unexpected location. The setting includes a prairie garden and the Salt Creek greenway, some awful nice scenery adjacent to a bank parking lot.
Look for the plaque that explains the structure. Find the following phrases from the plaque and fill in the corresponding digits.
. . . for more than AB years.
. . . a vital part of our community since IJKL.
. . . serving as the body’s chair for more than GH of those years
Placed September CDEF
X = F - E
Z = G+H
Y = K+L
Final is at N 41 51.XAB W 087 56.YZY
Fun fact: I was one of the 150,000 babies referenced in the text on the plaque.