Stop calling it a Ballroom just because he does. Stop the construction immediately.
It's a Big Baby Bunker. He has no plan to give up the keys to the White House. That's why it's his priority. He hasn't got much time to get it done.
It's got a restaurant and a hospital and a military command center so he can lay in bed, get his burgers and drugs, and shit himself while streaming the destruction of America life-size on massive TV screens.
He's going to lock himself in and gather his human shields around the building. If I were a gambler, I'd put money on that. That's his kind of fun.