Olivia's Treehouse was one of the sets released in January of 2012. It is now retired.
This set builds a tree with a ladder, deck, railing, and a telescope stand in the middle and a rope ladder leading to a "crow's nest" on top. At the base of the tree is a box with crystals hidden by greenery. The tree can be decorated with flowers, butterflies, and ladybugs included in the set. It also builds a bench, flowers, a birdhouse, and a cat bed.
An Olivia minidoll was included.