Welcome to 1520 Sandcastle Drive, a beautifully updated single level home situated on an exceptional 11,550 sq ft flat lot in one of Corona del Mars most desirable neighborhoods. This 2,500 sq ft residence offers a thoughtful layout with vaulted ceilings, two fireplaces, and a seamless flow between the formal living room, dining area, and separate family roomideal for both everyday living and entertaining. The kitchen features an eat in breakfast nook and connects easily to the main living spaces while maintaining a sense of privacy and functionality. With four spacious bedrooms and 3.5 bathrooms, the home is designed for comfort and flexibility. A private primary suite anchors the bedroom wing, while a separate guest suite with a remodeled full bath can be added onto ideal for visitors, multigenerational living, or use as a Junior ADU. Step outside to a beautifully landscaped backyard with rose gardens, manicured hedges, and scenic canyon and hillside views, perfect for outdoor dining, entertaining, or quiet relaxation. The expansive, fully usable lot offers tremendous potential to expand the main residence or build a detached ADU up to 1,200 sq ft (subject to city approval). An oversized 3 car garage and bonus room with storage complete this versatile property. Located on a quiet street just minutes from beaches, top rated schools, and the shops and restaurants of Corona del Mar Village, this home combines turnkey comfort with the opportunity to create your dream compound in a premier coastal location.