Of course the cache is not at the listed coordinates so don't try climbing up to the roof of the building, they don't like it when you do that.
I've always been fascinated with Presidential history and trivia. Weather you like the guy in office or not, when they are in office they are one of the most important and powerful men in the world. So, just for fun, here's a few of them for you to look at.
plus 
= A
minus 
= B
plus 
= C
minus = D
plus 
plus 
= E
minus = F
= G
= H
times 
= I
N A B CD
W E FG HI
You can check your answers for this puzzle on GeoChecker.com.