- This is not a building. I would say it's more a spaceship, or at least, what's left of it.

- A spaceship? This thing could never fly!

--- That's the reason why it crashed to the ground.
-- ?

-- You mean it would have been designed only to stay in orbit?
- This is at least a possibility.

--- You see this rounded section? It looks like the floor is opposed to the central axis. It's not in the same direction as the other floors of the rest of the structure...