It’s every child’s dream: a treehouse with a swimming pool, sauna, secret passageway, and lots of space to play. So expect some well-heeled kid to come along and drop $2,495,900 on this Palisades palace. It’s a good bit more than the $1,640,300 the place was assessed at last year, and it tops the $2,080,000 it sold for in 2008, but you do get some bang for your buck at 2724 Chain Bridge Road NW:

More details at Estately.