One or more photo(s) has been virtually staged. Located behind the gates of Bay Isles in the established enclave of Queen's Harbour, 3519 Fair Oaks Lane on Longboat Key offers 3,957 square feet of custom-designed living space with golf course and serene lake views. This residence was thoughtfully created in collaboration with the original developer as a fully customized floor plan to accommodate a large family-resulting in a layout that is both expansive and highly functional. This two-story home features 4-bedrooms plus a spacious upstairs multipurpose room that can easily serve as a fifth bedroom, along with 4.5 baths. The first floor is designed for gathering and everyday comfort, beginning with a private office at the entry, a formal dining room with 14-foot ceilings, an expansive family room, a generous kitchen with breakfast area, and a 1st-floor primary bed/bath suite. The kitchen offers solid wood cabinetry, stone surfaces, stainless appliances, a 5-burner natural gas cook-top, abundant counter space, and a breakfast bar-opening seamlessly to the main living areas and outdoor setting. The primary suite enjoys tranquil views of the pool, golf course, and lake, and includes walk-in closets, a soaking tub, and separate walk-in shower. Upstairs, three additional bedrooms are complemented by a large multipurpose bonus room that provides flexibility for a fifth bedroom, media room, playroom, or secondary office. Two bedrooms are connected by a Jack-and-Jill bath, while the remaining bedroom and bonus room share an additional full bath-ideal for larger households or hosting guests. Outdoor living reflects the relaxed elegance of Longboat Key, with a resurfaced saltwater pool, expansive paver deck, and mature tropical landscaping overlooking the fairway and water beyond. The setting is private, peaceful, and designed for enjoying Florida's indoor-outdoor lifestyle. Major system updates add meaningful value, including a roof replacement in 2020 and air-conditioning systems replaced in 2022. An oversized two-car garage, two attic storage areas, and maintenance-free living within Queen's Harbour further enhance convenience. Ownership includes deeded access to the private Bay Isles Beach Club on the Gulf of Mexico. Golf, tennis, boating, St. Armands Circle, and downtown Sarasota are just minutes away. A rare opportunity to personalize a truly custom-designed residence built for space, function, and multigenerational living-set within one of Longboat Key's premier gated communities.