To find the cache just enjoy the view and make notes of what you see.
When you get to the listed coordinates, establish what "block" you are standing in. You should be able to see some numbers inside the block. The first number to the south of where you are standing, minus 30 = AB
From this vantage point you can also see two large bodies of water. (Some of you may need to stand on your tip toes and crane your neck a bit, but don't stand on top of any ledges or railings.) The number of letters in each word of the smaller large body of water makes a two digit number and = CD
If you have good eyes, you should be able to spot two European countries from here. The number of letters in both of them combined = E
Now turn and look in the other direction. Can you see beyond the borders? How many states can you see west of the Mississippi River? = F
Now turn and look east again. You can easily see the Chicago skyline from here. But if you strain your eyes and look past it, you can see in the distance another city skyline, shining white in the sun. The number of letters in that city, +3 = G
In fact, you should be able to see several city skylines from here, perhaps even a couple of states. The total number of letters and blank spaces in the name of the most populous city = T
The number of letters in the smallest and least populated state you can see = U
Back to the block you are standing in, the number that is to the north of where you stand, minus 1 = VW
The number of letters in the largest state that you can see from here = XY
The number of letters in the word that defines the largest body of water, plus the number of letters in the word that defines the smaller large body of water = Z
n=AB CD.EFG ------ w=TU VW.XYZ
Be watchful at all times for muggles. Remember, you are simply admiring the view.
To solve the puzzle it is important that you not just dwell on the small details.
Sometimes you have to look at the big picture
congratulations to xAdhesivex, the first to come and take in the view.