They have two other boutiques in chicago, actually, and they're based here.
Locations:
520 N. Michigan Avenue
Chicago, IL 60611
Ring: 1.312.644.9450
The Peninsula Hotel
108 E. Superior
Chicago, IL 60611
Ring: 1.312.335.9858
Along with one in NY and one in Las Vegas, and the aforementioned location on Armitage.
I'm not sure if the chocolates are made at one of the boutiques, or if they're in a central kitchen somewhere else in Chicago, but they're all made in Chicago.
Another quick tidbit: Katrina Markoff, founder and CEO of Vosges, was recently a judge on Iron Chef America, where the theme ingredients (yes, two, I know, gah!) were chocolate and coconut.
-ed