Part of me agrees with you.
The other part of me knows damn well the U.S. would pay for the move, and still be stuck with the U.N.-owned property in NYC, which would probably end up being used for 'international offices' or some other b.s. shorthand for 'Diplomat No-tell Mo-tel.'
It's still better than keeping "Famous Anus" and his crew of incompetents, effendis, and malfactors..