Nestled at the quiet end of a cul-de-sac and accessed via a private driveway, this California Spanish style estate in the sought-after Wikiup neighborhood is a rare find for a buyer who values structural integrity and architecture. Now offered at $1,159,000, this property represents a well-built canvas for those looking to create a custom retreat in one of Sonoma County's most established communities. The main residence is just under 1,400 square feet of thoughtfully engineered living space. Built with 6-inch thick walls and R30 ceiling insulation, it offers exceptional climate control and a whisper-quiet interior. The home features cathedral ceilings with exposed wood beams and radiant heat. One of the most unique aspects of this home is its built-in flexibility: the expansive primary bedroom on the lower level is designed for an effortless split into two separate rooms. The specific dimensions and wall plans can be changed per owners needs, providing a roadmap for a new owner to increase the bedroom count with minimal structural guesswork. Additionally, there are possibilities for expansion to include a primary suite and expanded kitchen, dining, or living room options to better suit a modern lifestyle. The value is further enhanced by a newer, fully permitted 870 square foot accessory dwelling unit. This secondary home features 1 bedroom, 1.5 baths, radiant electric heat and a durable steel roof. It includes its own single garage with an adjacent bonus workshop or hobby room, and a carport, making it ideal for a sophisticated guest house, rental opportunity, or a high-end home office. Set on over 2 acres of prime land, the grounds offer panoramic views and ample space for a pool, RV/boat parking, or expanded outdoor living. While the property is ready for a landscape makeover and new decking, the foundation is incredibly solid with fire-resistant tile roofing and a new heat pump water heater. For the car enthusiast, the main insulated garage features a built-in service pit and abundant storage. Complete with city water and sewer, the location perfectly balances seclusion and convenience. You are minutes from the Wikiup Swim and Racquet Club, world-class hiking trails, and the Charles M. Schulz Sonoma County Airport (STS). With easy access to Highway 101, hospitals, and local shopping, this hidden gem is ready for its transformation.