Inspired by our weekend adventure, we've been dreaming of having a home office in a tree house. We found some downloadable plans (even one for novices) so now all we need is a backyard and a big ol' tree:Our very favorite it the San Pedro Treehouse. It's basically the classic one tree tree house. You can download plans for a 50 square foot tree house that you build in around 14 days. The download only costs $29 and it walks you through each step of the process. All materials and tools are readily available in major hardware stores and the plans feature two window seats and a covered balcony section.