Tucked onto a hilltop with views spanning the picturesque Sonoma valley stands a striking embodiment of William Turnbull, Jr.'s architectural genius. This expansive 7,681 sq ft residence sits on a generous 4.3-acre lot, bordering the Trione-Annadel State Park, and views of Sugarloaf Ridge State Park and outlooks toward Valley of the Moon. Turbull's careful consideration of site, climate and materials are deeply rooted into this home that feels both modern and timeless. This gem offers an exclusive retreat within the coveted Wild Oak subdivision that overlooks the Wine Country Polo Club where the oldest of equestrian sports is played. The single-story home, crafted from wood and steel, features soaring ceilings and a bank of French doors in both the living and dining rooms that open to the views, and provide access into oak groves for outdoor entertaining. An infinity pool adds a touch of luxury to this rural haven. An 1,125 sq ft 3 bed, 2 bath guest house, perfect for hosting or creating a private workspace is also part of the sale. A rare opportunity to own a piece of architectural history. This homenever before on the marketawaits a discerning buyer to embrace a home with exceptional architectural features and grand potential far surpassing other Sonoma County estate homes.