Noticed on the testing server.
When hovering the remove building tool over a level 5 Improved Storehouse it does not display a message to say that it will be returned to the star menu as it does on at least levels 1 and 2 improved stores.
On removing a level 5 improved storehouse, it did not return to the star menu. An improved storehouse below level 5 (unsure of exact level) did return to the star menu.
Will this be true on the live server as well?