I love it Kyle.
It just screams GYM. It's truly amazing. And I really love how you partitioned the upper portion of the gym into a deep wood area, and an underground roots system. It's completely awesome.
The cob webs are great too, but what I really love is the living quarters. Now, I'm not sure if you are going to make the exterior different for each city ( I know I'm not), but either way, it looks amazing. I myself see it as; the inside counts the most, and with a world as big as mine, if I were to have different looking gym exteriors, it would be kind of difficult to locate a gym in one of my cities, unless they all had the same look. But, your case is different, you could create the exteriors, and it would fit perfectly with your world.
Though, back to the core topic; your gym is amazing, and I hope you realize the quality of your work, because it is of the highest quality.
I can't wait to see more Kyle, and I'm extremely happy for you with all your progress.
Don't give up,
Captain Arcane