The CornerStone Cache Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(micro)
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In an effort to expand our hides beyond the traditional one stage type, here is our first attempt at a puzzle cache.
There is NO need to go to the listed coordinates, The cache IS NOT there.
THERE IS NO NEED TO ENTER ANY OF THE BUILDINGS FOR THIS CACHE.
At each of the buildings you are looking for a date, (year only) that will help you solve the puzzle and find the final cache. The date is located on a similar area of each building, and can actually be seen without even getting out of your vehicle.
As you find the four buildings, and the information you need, record the date. Add the numbers of each date individually to come up with a 2-digit number. (Example: If a date is 2007 you would add 2+0+0+7=09, that number would translate to “YZ” with Y=0 and Z=9)
The four sets of coordinates you need are as follows:
1) N41 47.904 W092 04.465 Date _ _ _ _ Total _ _ = A B
2) N41 47.857 W092 04.225 Date _ _ _ _ Total _ _ = C D
3) N41 47.804 W092 04.194 Date _ _ _ _ Total _ _ = E F
4) N41 47.863 W092 04.108 Date _ _ _ _ Total _ _ = G H
The final is located at:
N41 47.(A+H)CD W092 04.EG(B+F)
Permission for this cache granted by the property owner at the final location.
At the final location, there is no need to go near the main display area.
Additional Hints
(Decrypt)
Erzrzore gur anzr bs gur pnpur!