Local News Photos: Mill Valley 'Tree House' Hits Market For Almost $700K May 10, 2017 / 12:38 PM PDT / CBS News A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker). Mill Valley tree house A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker). Mill Valley tree house A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker). Mill Valley tree house A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker). Mill Valley tree house A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker). Mill Valley tree house A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker). Mill Valley tree house A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker). Mill Valley tree house A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker). Mill Valley tree house A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker). Mill Valley tree house A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker). Mill Valley tree house A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker). Mill Valley tree house A small cottage in Mill Valley that sits on just under one-third of an acre has gone on the market for $679,000 (photo: Coldwell Banker).