Step into a piece of Islip history with this extraordinary 1850s Colonial, a remarkable three-story residence offering approximately 5,145 square feet of living space, 8 bedrooms, 5 full bathrooms, 1 half bath and three separate staircases. Rich in architectural character and thoughtfully updated with modern amenities, this distinctive home beautifully blends historic craftsmanship with contemporary luxury. A grand entryway and sweeping staircase introduce an impressive interior showcasing original details, exposed wood beams, hardwood floors and multiple fireplaces. The formal living room features a wood-burning fireplace, while the chef's kitchen is appointed with top-of-the-line appliances, a striking 10-foot island, exposed beams and an original fireplace converted to gas. An adjacent pantry and laundry area add convenience. The main level continues with a dramatic family room featuring soaring cathedral ceilings and a gas fireplace, along with a spacious office or optional bedroom with its own fireplace. A custom rear staircase leads to the serene primary suite overlooking the picturesque park-like grounds. The luxurious en-suite bath features a freestanding soaking tub, oversized walk-in shower with multiple body sprays and a custom walk-in closet. Additional bedrooms, full bathrooms and a second laundry area complete the second level. Ascend the home's original winding staircase to the third story, where additional bedrooms and a spacious recreation room offer exceptional versatility, complemented by abundant closets and a finished storage room. Outside, expansive park-like grounds create a private outdoor oasis highlighted by a beautifully designed, fully fenced heated saltwater in-ground pool. A dedicated pool house/cabana with a changing room and full bathroom enhances the resort-style setting, while an additional shed provides convenient storage. The detached two-car garage is equipped with a Tesla Universal Wall Connector for EV charging. A rare opportunity to experience the history, craftsmanship and architectural character of an 1850s residence beautifully enhanced for modern living in the heart of Islip.