I would try to make the building's base concrete texture more saturated because it looks quite "empty" right now, a little eye-catching.
The tallest crystal spire's pipe is slightly off center when viewed from different angles. I believe it's only the pipe.
The second and third tiers have a wall glitch with some sort of a TC line, can be seen in the game view, you might want to fix this.
I would also move the TC ladder forward so it has at least 3 steps design-wise, just like in the birth sequence: one step looks a little lonely and... how can the great hall have only 1 step?
It was a quick glance. Please don't mind if I'm being too picky.
Regards!