Introducing one of the most exceptional homes ever offered in prestigious Port Antigua! Casa Contessa is a 2023 modern coastal estate built by the seller for the seller, with every feature intentionally selected to be top-tier. This 5BR/6.5BA, 3,597 sq ft residence is engineered to perfection with full CBS construction, impact windows/doors, and a true concrete roof. Tucked on a quiet cul-de-sac, the property delivers the ultimate Keys lifestyle with 78 ft of concrete dockage, a boat lift, a heated concrete pool & spa, and a full outdoor kitchen. A dedicated pool bath with a steam shower adds a spa-level luxury rarely found in the Keys. Port Antigua's private sandy beach and gated boat ramp are moments away. Inside, craftsmanship and design shine. The chef's kitchen features a dramatic stone island, Viking and Miele appliances, a built-in espresso machine, and wine cooler. Expansive living areas open to multiple terraces with views of the Atlantic Ocean and spectacular sunset skies, blending modern elegance with island comfort. A future rooftop deck is also possible for even wider views. All five bedrooms offer private en-suite baths, each one uniquely finished with hand-selected stone and tile. No two are alike, giving every suite its own identity. Large walk-in closets elevate livability, while the ground level includes a second living room, bedroom, wet bar, and lockout door, ideal as a guest or mother-in-law suite. Luxury extras include an elevator, independent AC zones for each floor, and two on-demand hot water heaters. Offered fully and tastefully furnished, this home stands as arguably the finest property available in all of Lower Matecumbe. A rare opportunity to own a truly custom-built masterpiece. Seller open to seller financing.