This 5,100-square foot residence and its 600-square foot guest house surround a heritage Blue Oak tree that serves as the visual anchor to this estate. The home has a pool nestled in a space that feels private even as it is out in the open. The 2 bedroom, 2.5 bathroom house has the same duality of spirit — look inward to the Blue Oak and enjoy a quiet moment in one of the high ceilinged rooms or step out on the loggia and bask in the sunshine. And suddenly, it’s easy to imagine this acre of land in Southern Italy rather than Portola Valley.