Guess a few retakes of Air Law required
Here's my guess:
Class G can go up to FL195. Above FL100 need to use a Xpdr A+C.
FL195-FL245 is Class C LTMA areas, except the TRAs.
UIR (>FL245) is Class C.
I am not sure if that area is covered by a TRA, but if so, it tends to be quite flexible if you talk to the right people over using it...
NoD