The "Crown Jewel" of South Barrington's classic Willow Bay subdivision. 45 Willow Bay Drive is the largest luxury estate situated on the largest lot (1.7 acres) that leads to a cul-de-sac and prime location next to a beautiful pond with sensational EAST views offering peace and tranquility. Arrive on your new circular drive to explore this custom-built home by a Barrington area luxury builder who has overseen 20,000+ new construction homes over a 30-year career. This spectacular All-Brick mansion features 5,723 sq. ft. living above grade plus a 2,963 sq. ft. finished basement. Walk into the stunning foyer with a glorious chandelier. Entertain in your family room with 20 ft. soaring ceilings, formal living room, dining room, first floor bedroom with ensuite bathroom (currently utilized as an office) and a spacious den. Chef's kitchen beautifully remodeled with custom cabinets, granite counters and stainless appliances with a secondary prep kitchen on the main floor and a third kitchenette in the basement. The second floor offers the functionality of four bedrooms with a primary suite and spacious flex room and 5th bedroom in the lower level. Perfect home to entertain with a deck and plush backyard. Close to the Arboretum of South Barrington, Community Park and I-90. Downtown Barrington Metra, shops and boutiques just five minutes away. IMPROVEMENTS & UPGRADES: "BRAND NEW" Driveway (2025) + NEW Pella Windows (2025) + NEW "Davinci Roof" (2020) + NEW Oak wood Floors on 2nd Level (2024) + NEW Brazilian Cherry Floors in Primary Suite & Junior Suite (2023) + Junior Suite Bathroom (2023) + NEW Furnace (2023) + NEW Hot Water Tank (2022). Live the good life at 45 Willow Bay Drive!