Building tokens expire in a week (I think, don't quite me) or so because of the issue with iOS 8.1.1 not allowing users to view lands.
As mentioned, Building Tokens are good until ext Friday (November 28th) at noon PST. Crux Chests and Keys will be removed TODAY at noon PST, so use them up while you can.
Sure there is Troll. Just sell a building for the refund, then use the tokens to rebuild. Make some gold at least. Although you'll need 3-5 tokens depending on what building you tear down.