The Squirrel Condo was a tree in our back yard. It had 3 trunks, two of which were connected by a branch that grew out of one trunk and into another. The squirrel population had created itself quite a home, entering through an opening in the base of the tree.

Unfortunately, it just got too hollow and weak to stand, and we had it taken down so it wouldn't land on our (or our neighbor's) house.