Welcome to Casa Bianca, a spectacular Siesta Key bayfront estate offering breathtaking views and deepwater boating minutes to the Gulf of Mexico and Sarasota Bay. This is a rare opportunity to own one of the most iconic properties in Sarasota with dockage on Big Pass. Nestled behind a privacy wall and surrounded by spectacular, colorful gardens, this waterfront oasis offers a serene retreat. By day and night, savor the stunning skyline views of the Ringling Bridge, Bird Key, Lido Key, and downtown Sarasota across the bay. This 18,250-square-foot property is located on Bay Island, the gateway to Siesta Key, on one of Sarasota's most coveted streets. The first living level is elevated nearly 18 feet; the residence boasts panoramic water views from nearly every room. The spacious, open floor plan features soaring ceilings, seamlessly flowing from the bayfront gathering area to the kitchen, dining room, and family room. Entertain guests in style with a full custom bar. The private office is equipped with a desk and built-ins, perfect for the busy executive working from home. Large, covered terraces on two levels provide ideal spaces for entertaining, dining al fresco, or relaxing. Marble floors and custom railings enhance the luxurious ambiance of this special residence. Access the upper level via a gracious staircase or the three-stop elevator to the expansive primary suite, offering breathtaking views, a dressing room, and a sumptuous bath. Three additional bedroom suites with full baths ensure privacy for overnight guests. The expansive pool area epitomizes outdoor living. With one of the area's largest deepwater docks (rebuilt in 2024), a boat lift, and a jet-ski lift, there is ample space for water toys and quick access to the Gulf and Sarasota Bay. The 1,100-square-foot garage provides abundant space for vehicles and storage. The property offers endless opportunities for connecting with nature through boating, paddle boarding, snorkeling, windsurfing, and fishing, all from your private oasis. Discover dolphins, manatees, and an array of fish and waterfowl. In the evening, savor colorful sunsets and sparkling views of downtown Sarasota, Lido Key, and Bird Key. Arguably one of the best locations on the island and in all of Sarasota, this highly desirable North Siesta Key location is minutes away from the world-famous powdery white sands of Siesta Key Beach and the crystal azure waters of Siesta Key. The quaint shops and alfresco dining spots of Siesta Village are just minutes away, while the vibrant allure of downtown Sarasota is just across the north bridge. Considered the cultural gem of Florida’s west coast, Sarasota offers abundant urban, cultural, and social activities, including fine dining, a world-renowned art museum, galleries, ballet, symphony, opera, theater, and numerous charitable events. Convenient to Sarasota Bradenton International Airport, private aviation, and multiple golf courses, with easy access to Tampa, Naples, and Miami, Casa Bianca represents the epitome of luxury waterfront living.