Mostly their own personal ones. The US dues pay for the biggest chunk of their entire operating costs. And all most of the members do is curse the US for interfering in their wars. I think we should say "It's been fun, and thanks for all the fish". Then invite to take their corrupt to the core and find some other country to set up shop, say like oh Somalia, or say Syria, or better yet help them move to Ethiopia. Yep that's where they need to move the UN, then give them a year to get out, and the level the place or tour it into a Tourist spot and business offices, Stores, flea market, (pretty sure the flea market would do best of all, since the UN is filled up with fleas) and maybe a couple apartments. It's really expensive property, good view, easy to get to, and it would turn a profit after the renovation. That is as long as the UN, or the State Department isn't allowed to run the place.