Any guesses on what that circular structure on top is going to be?
Maybe just something mechanical like the top of the elevator shaft, or air conditioning units, or something similiar.
Or maybe something neat like an observation deck for fireworks?
I remember when BWV was under construction, initial promotional materials indicated that 'the Attic' was going to be a members lounge, especially for viewing fireworks. By the time they started selling though, that idea was scrapped and it became a lounge for private functions only.