[Kaperstone]

The building lacks windows and should be made out of stone because of its location being at the middle of the city.

Windows, beside giving a look it would give the passing by player mind that it is a gym when he looks through the window, so it would emphasize a bit more that its a gym.

Also it would be better if you'd use less objects on top of each other.
Its annoying to go and see them overlaying each other all the time.