Bart's Tree House

 is a custom treehouse owned by Bart Simpson. Upon its construction, he is unlocked. The Tree House unlocks at Level 12, and was originally the only Level 12 quest item needed to build until the Springfield Library was introduced at a later date with Martin. Upon building the treehouse the player unlocks the third cutscene.

The Tree House 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 Tree House, it even has the same properties as a decoration, however, the Tree House is included in the Buildings section rather than in the Decorations section. This is most likely because Bart comes with it. However, other characters have been released with other decorations that are in the actual decorations category. This is likely because this was the only character decoration released on the initial launch, while the other two came with updates.

About
Bart's treehouse is owned by Bart Simpson that resides in the back garden of 742 Evergreen Terrace. Bart and his friends usually read comics in the treehouse.

It is a small house made of wood with a ladder leading up to it and a secret entrance in the floor. It's got a couple of windows as well as the door. The interior of the treehouse often changes, usually it contains only rudimentary furniture, but other times extravagant furnishings.

In Burns' Casino 2016 Event the player can buy a fačade for the Tree House: Bart's Casino.

Regular
Bart Gino Underdunk Terwilliger Herman Milhouse
 * Have a Sleepover - 24h
 * Wait for Bart - 8h
 * Draft Battle Plans - 4h
 * Have a Sleepover - 24h

Level Quest Based
Bart Gina Vendetti
 * Kiss Gina Goodbye - 60m
 * Hold Hands With Bart - 30m
 * Pick Bart’s Pocket While Kissing Him - 60m

Quest Based
Bart Comic Book Guy Database Dolph Greta Wolfcastle Homer Janey Jimbo Kearney Kirk Lisa Martin Milhouse Nelson Ralph Skinner Sherri and Terri Uter
 * Hide From Bullies - 24h
 * Watch Itchy & Scratchy - 8h
 * Write Angry Letters - 10h
 * Write Angry Letters - 10h
 * Write Angry Letters - 10h
 * Watch Itchy & Scratchy - 8h
 * Write Angry Letters - 10h
 * Write Angry Letters - 10h
 * Hide from Springfielders - 24h
 * Write Angry Letters - 10h
 * Watch Itchy & Scratchy - 8h
 * Write Angry Letters - 10h
 * Watch Itchy & Scratchy - 8h
 * Write Angry Letters - 10h
 * Gold-Farm in Homer's Happy Little Elves Game - 24h
 * Hide from Springfielders - 24h
 * Read Fine Print - 12h
 * Watch Itchy & Scratchy - 8h
 * Write Angry Letters - 10h
 * Have a Sleepover - 24h
 * Watch Itchy & Scratchy - 8h
 * Write Angry Letters - 10h
 * Watch Itchy & Scratchy - 8h
 * Write Angry Letters - 10h
 * Watch Itchy & Scratchy - 8h
 * Write Angry Letters - 10h
 * Watch Itchy & Scratchy - 8h
 * Write Angry Letters - 10h
 * Crash at Bart's Treehouse - 12h
 * Watch Itchy & Scratchy - 8h
 * Write Angry Letters - 10h
 * Write Angry Letters - 10h

Façades

 * Bart's Casino
 * Museum of Modern Bart