Comment: I thought I might have met a curious soul

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In reply to comment: the mass and potential energy (see in situ)

I thought I might have met a curious soul

But you're only looking to go around and around. I'm sure you know what you're doing and I wish you all the best at it.
Try the experiment. Try it on paper, I gave you a link to equations. But I'm sure you'd never do that because it might turn out Newton was right and a small weight (top 10 floors) can't obliterate a huge mass 10 times its size (the whole rest of the building).

I invite you to watch the film "Zero" and have a great night.

If you happen to be one of the paid posters from DHS or AIPAC, I feel bad for you because this site is a tough nut to crack. Most of us don't even have TV sets and have read many many books. We are different than the crowds they train you for. If you're not, please accept my apologies for even hinting at lumping you with those un-American pieces of garbage.