The 1.4 update offers the new feature to "Nuke" your town. This feature will appear at District 5 while you're in Deco mode. Tapping on the red Nuke button in the bottom left corner will store everything to reset your town. Buildings and decorations will be placed in your inventory (unless in use) and the roads will be deleted. Player level and character XP will be kept. You will be asked to confirm this twice because you cannot undo this action.