[JACKinBeantown]

I'd love to see something like that happen. But considering that this is New York and space is at a premium, first you'd have to find a replacement site for Madison Square Garden (maybe in Hudson Yards over the rails). Just a guess on my part, but you'd also probably need to incorporate office space above the great hall, just as MSG is above that location now. It could be done... I'm not an engineer, but consider a vaulted ceiling to support a building above this space while allowing for plenty of light to come in, like the great cathedrals of Europe.