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. Priced to sell below appraised value! Bring your designers to update as you like. 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!