I demolished a load of storehouses to make room for the new Improved ones, and was gutted at the lack of resources we get back for that.
Now BB have introduced the epic woodyards, there will be people who will be deleting a load more L5 buildings, and this will be on the increase I guess with the advent of the other planned epic buildings.
Surely we should be getting back a percentage of the "total" resources we have used to level these up? And yes, even gems for those silly enough to have used them at L5 (lol).