Bart's Treehouse is a custom treehouse owned by Bart Simpson. Upon its construction, he is unlocked. The treehouse is a somewhat different building, and is even considered to be more of a decoration. The building does not provide income, nor can it be interacted with directly in any way. It is also built instantly, much like decorations. When moving the treehouse, it even has the same properties as a decoration. However, the treehouse is included in the Buildings section rather than in the Decorations section. This is most likely because Bart comes with it.