An extraordinary treehouse with 64 diamond-shaped windows forming an 11,000-pound pinecone that dangles high in the trees is on the market for $150,000. If you have a piece of open land with towering trees, think Redwoods, this could be a great opportunity. Dustin Feider, of O2 Treehouse in Oakland, is the brains behind the design and says the work was built earlier this year for home goods company S.C.