Welcome to 676 18th Street, a rare jewel nestled in the heart of Manhattan Beach's esteemed American Martyrs neighborhood. This custom Coastal Plantation–style estate, that was thoughtfully reimagined by RJ Smith Construction, radiates modern opulence and coastal elegance, inviting a sophisticated beachside lifestyle. Upon entering, you're greeted by a dramatic interior flooded with natural light and impeccably designed for seamless flow. The chef's kitchen anchors the open-concept living area, while the adjoining family room, formal living room, and dining spaces provide gracious spaces for both everyday living and grand entertaining.  A versatile private office or bedroom on the main level offers flexibility for a home office or guest suite. The spectacular basement is an entertainer's paradise complete with a one of a kind golf simulator, theater, wine cellar/bar, game room, and a guest suite/workout studio, Upstairs, discover four refined en suite bedrooms and a stunning master sanctuary perched to capture majestic views of distant snow-capped peaks. Luxury continues with spa-like baths, fireplaces, and an elevator serving every level for ultimate convenience. Step outdoors into the sun-drenched, south-facing backyard-a lush, grassy oasis perfect for relaxing or hosting al fresco gatherings under the gentle California sun. A three-car tuck under garage and sophisticated landscaping complete the picture. This spectacular residence redefines coastal elegance in Manhattan Beach.