18679 Diddy Circle Rarely does a Fountain Valley home offer nearly 4, 000 square feet of combined living space, a 4-car garage, an attached ADU, and an expanded driveway accommodating 6-7 vehicles, all on a 10, 048-square-foot cul-de-sac lot. Built in 1998, this executive home is one of the newer custom residences in Fountain Valley's prestigious Hampton Place Tract, known for its tree-lined streets, award-winning schools, pride of ownership, and prime location near Harper Park and approximately three miles from the beach, this property offers a 3, 025 square foot main residence and an attached 892 square foot ADU completed in December 2024. Exceptional curb appeal features a lush front lawn, raised stone planters, a beveled glass entry door, and manicured landscaping. Fresh interior paint, hardwood flooring and tile downstairs, new carpet upstairs, recessed lighting, and abundant natural light enhance the home. The floor plan offers four bedrooms plus a bonus room, formal living room or fifth bedroom/home office, formal dining room, family room with fireplace, remodeled powder room, separate laundry room, and ceiling fans throughout. The kitchen features granite countertops, extensive cabinetry, glass display shelving, two oversized pantry cabinets, a center island, built-in wine refrigerator, five-burner cooktop, utility sink, and abundant storage. Upstairs, the primary suite offers vaulted ceilings, a walk-in closet, fireplace, dual vanities, soaking tub, and separate shower. Three additional bedrooms, the bonus room, and an upgraded secondary bathroom with dual vanities and travertine flooring complete the second level. The backyard features a built-in BBQ, spa with waterfall, fire pit, fruit trees, artificial turf, patio, and two large storage sheds. The attached ADU offers 2 bedrooms, 2 bathrooms, indoor laundry, its own air conditioning system, and flexible living space for multigenerational living, guests, or rental income. The expanded four-car tandem garage offers approximately 200 additional square feet with Racedeck flooring, custom glass display cabinetry, built-in seating with concealed storage, extensive cabinetry, and a craft/workbench. Additional upgrades include a newer HVAC system, upgraded electrical panel, Prism and security exterior lighting beneath the eaves, and a residential fire suppression system. A rare opportunity to own one of Hampton Place's finest homes with newer construction, a private ADU, and exceptional parking.