Situated on a premier corner waterfront lot within the gated Sanctuary at Costa Grande, this custom Spanish Mediterranean estate offers timeless architecture and elevated coastal living in Port O'Connor, with canal and Intracoastal Waterway views from nearly every room. Designed for entertaining, the home seamlessly blends indoor and outdoor spaces, anchored by a gourmet kitchen with high-end appliances and designer finishes. The adjoining living area features a fireplace, custom bar with wine cooler, and expansive windows overlooking the water. The main level hosts a private primary suite with outdoor access, walk-in closet, and dual vanities, along with a beautifully appointed office, powder bath, laundry room, and walk-in pantry. Upstairs, guest bedrooms are complemented by a recreation lounge with built-in bar, sink, wine cooler, and ice maker, opening to a balcony with elevated water views. A separate poolside casita offers guest accommodations. Outdoor living includes a covered patio, outdoor kitchen, fireplace, mounted TVs, and a pool with attached hot tub. Waterfront amenities feature a private dock for two bay boats, covered boat lift, fish-cleaning station, ample dock space, and a dedicated tackle room. Additional highlights include four HVAC systems, a 32-kW Generac generator, commercial ice machine, and a three-car garage with one bay designed for a bay boat. Defined by striking architecture, designer touches, and an exceptional corner-lot waterfront setting, this residence offers a rare opportunity to experience refined coastal living in one of Port O'Connor's most desirable gated communities.