It is official fact that any player cannot get back the building sold/deleted accidentally. This happens with many of SimCity Social Player, while collecting Simoleons and Material or interacting with buildings to get collectible items in frenzy. You mean to click something else and just because of a wrong POP you just end up selling your premium item. I have seen many of the players losing their Premium buildings like Fairy Tale Castle, Robot Factory and other buildings which one can obtain through quest events only.
If you have lost any building, you have to purchase it again to get it back. Is there any chance to get your building back if you sell it or delete it by mistake?
There is still a feeble chance to undo the deletion/selling of building or for that matter you can undo any action you took recently.
I am one of the SimCity Social Player who kept on suggesting not making any hasty clicks while playing SimCity Social. Well one day I was doing the opposite and whoosh…I click to sell my building. My immediate reaction was to close the Web browser (Google Chrome) by sheer gamer’s instinct. When I logged to check, I was relieved to find my building back.
Well this is my simple trick and a slight possibility of you to get your building back. If you close the Web Browser before SimCity Social get refresh and send your set of action over the internet, there are chances that you will get your building back.