Remember that once you place an improvement, it's there for good, so be sure you're happy with the placement and rotation before you tap the green placement button.
Yes, it's true that you should make sure you're happy with the placement of a town upgrade before you tap "Confirm". However, if you decide later that you really don't want it anymore, you can purchase a demolition order from the store, use it on the item you want gone, and voila! If you decide that you want the item back, you'll have to purchase another one.
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