Not too far from the lake stands a treehouse built by a former Groundskeeper before his untimely end at Hogwarts. Now, the treehouse is maintained by whichever Groundskeeper happens to be employed at the time.

Underneath is a rope ladder that is used to get inside the three house and tied to one of the branches of the tree is a tire swing hung up by Mr. Maclaren as he thought it would be a nice touch.

The inside is spacious, even without there being a charm placed to extend the inside and there is a large plush carpet at the center of the room. There are wide windows on all sides to keep the space properly ventilated and charms to keep it toasty during the winter months. Scattered here and there are large cushions and plush chairs for your comfort. Everyone is free to use this treehouse, just don't make a mess or the privilege may be revoked.