The cache isn't at the posted coordinates. Although if you go there please post a picture just for the fun of it. Your treasure is at:
The Westin Downtown
Trammell Crow Center - Patriot Tower
Ross Tower - Republic Center Tower I
Bank of America Plaza + JPMorgan Chase Tower - Trammell Crow Center
Ross Tower - Republic Center Tower I
Fountain Place
Thanksgiving Tower - Museum Tower
One AT&T Plaza + 10
Patriot Tower / 10