A rare opportunity to own a truly iconic property, cherished by the same family since 1973. Tucked at the edge of Northridge Open Space with seamless access to Blithedale Summit and the expansive trails of Mount Tamalpais, this estate offers limitless potential in an unspoiled, peaceful setting. Imagine stepping outside to trails that lead to waterfalls, serene ponds, and native flora, all backing up to miles of open space your own private gateway to the great outdoors. Bathed in natural light and spanning over 2 acres, this is a legacy in the making. The main house was designed and built by a remarkable couple a world-renowned entomologist and his wife, who was instrumental in preserving Horse Hill and the Northridge Open Space that surround the property today. The home features 3 bedrooms, 3.5 bathrooms, and a downstairs apartment, while four additional outbuildings dot the property creating the perfect framework for a family compound, retreat, or generational estate. Reach out and touch views of Mt. Tam and nature surround you, yet the property sits just minutes from vibrant downtown Mill Valley. This is your chance to become the next steward of a once-in-a-lifetime property, steeped in history and surrounded by the natural world its first owners helped protect.