[denizen467]

^ Renders are usually exaggerated in non-material aspects, like having an unrealistically large number of people who are unrealistically happy, handsome, and well-dressed and engaged in unrealistically productive activities. Ever see a grumpy fat guy smoking in a building render? Here, someone took some liberties with the background landscape.

Per Emporis (sorry ex-Emporis guys!), ORD's existing towers are 255ft and 260ft, so this is much smaller. In the US, "quite tall" would be something approaching 400ft (recently built at ATL).

The glass escape stair seems not very tornado-ready. At all. I think I would want my ATC folks to feel safe & comfortable, when tornadoes loom.