Under Construction. Poised along one of Longboat Key's most coveted stretches, this new semi-custom estate by Mason Martin Builders delivers sophisticated coastal living with rare peace of mind. Each level is designed to capture sweeping Gulf views without the exposure of direct beachfront placement, creating a residence that feels both refined and protected. It is your private sanctuary by the sea. Currently under construction and scheduled for completion in 2026, this architectural showcase spans approximately 10,300 total square feet with 4,900 square feet under air. Mason Martin's craftsmanship is evident throughout, with modern tropical lines, exotic landscaping, and refined stonework that blend seamlessly into the surroundings. Inside, the home is curated for luxury living and effortless entertaining. The main floor features a chef's kitchen anchored by natural gas and equipped with high-end Wolf and Sub-Zero appliances. An oversized island, full butler's pantry, and adjoining bar flow into the spacious living and dining areas. Floor-to-ceiling glass opens to generous terraces overlooking the lap pool, creating a beautiful blend of indoor and outdoor living. An elevator services all living levels. The residence offers five bedrooms, five full bathrooms, and a powder room. The primary suite is a serene retreat with a private bar, a Gulf-facing terrace, and a spa-inspired bath. Guest suites provide their own refined comforts, and two full laundry rooms on separate floors enhance everyday convenience. The ground level includes a four-car garage and a large flex space envisioned as a wellness sanctuary. Plumbing and power are prepared for a cold plunge, sauna, and gym. Outdoors, the property lives like a private resort with a long lap pool framed by shaded lounging areas, outdoor dining space, and lush privacy plantings. The one thousand square foot rooftop deck serves as the pinnacle of the home with an outdoor kitchen and panoramic sunset views over the Gulf. Construction details further elevate this residence with extensive use of Ipe hardwood providing warmth, longevity, and natural resilience. Every detail has been planned to create a home of lasting beauty, modern comfort, and architectural significance. This is a rare opportunity to secure a semi-custom Gulf-view estate on Longboat Key before it becomes the next headline sale.