Sell the UN building to the highest bidder. The new owners can evict the squatters.
Won’t make money. You have to evict the filth, then renovate the facility to remove the stench and stains, THEN put it on the market. It would take exorcists from several relions to clean the spiritual filth from that place and I don’t think they could agree on any of it.
Send the UN back to Europe—Bern or Brussels. We don’t need to support a clup for dictators.