Situated in the highly desirable Old Sunny Hills neighborhood of Fullerton, this exceptional custom estate offers a rare combination of privacy, space, and timeless architectural character. Set on approximately 0.52 acres, the residence encompasses approximately 5,415 square feet of living space with 5 bedrooms and 5 bathrooms. Originally built in 1976 and thoughtfully remodeled and upgraded throughout the years, the home blends classic design with modern comforts. The updated kitchen features newer countertops and quality finishes, while numerous improvements throughout the property enhance both functionality and everyday living. The roof has a 75 plus years life time. It is called a composite cement tile roof and fire proof. It's 25 years old now. Designed for entertaining and multi-generational living, the expansive grounds provide a true estate setting with mature landscaping, multiple outdoor gathering areas, and abundant parking, including space for RVs, boats, and numerous guest vehicles. Located near Laguna Lake, scenic walking trails, parks, golf courses, shopping, and dining, the property offers a unique lifestyle rarely found in Orange County. Residents also benefit from access to the highly regarded Sunny Hills school area, known for its strong academic programs and advanced educational opportunities. Offering privacy, scale, and extensive upgrades in one of North Orange County's most prestigious neighborhoods, this is a rare opportunity to own a true Old Sunny Hills estate.