Welcome to 27 Duane Ln, a classic Colonial offering over 4,000 sft of living space (1st & 2nd Fl) on a spectacular 1.85-acre property in one of Demarest's most coveted & picturesque locations. This remarkable estate is surrounded by sweeping natural beauty & offers rare privacy, breathtaking views & a peaceful, resort-like setting that can be enjoyed throughout every season. The main level features a welcoming center hall foyer, living rm, formal dining rm, inviting den w/fpl, spacious family rm, powder rm & convenient laundry rm. The kitchen serves as the heart of the home, complete w/a center island, dining area & direct access to a covered deck overlooking the magnificent backyard & serene natural landscape. Whether enjoying morning coffee, outdoor dining, or relaxing w/family & friends, the setting is truly extraordinary. The 2nd level boasts a primary suite w/WIC, office & bath w/radiant heated floors. 4 add'l BRs & 2 full baths provide ample space & comfort for family & guests. The finished walk-out lower level offers outstanding versatility w/a recreation rm, full bath, gym & abundant storage space. Additional highlights: wood floors, skylights, 4-zone BB heat, 3-zone c/a, generator, EV charger, attached 3-car garage and a bonus oversized detached 2-car garage. A rare opportunity to own one of Demarest's premier properties, combining timeless elegance, exceptional functionality & an unparalleled natural setting in one of Bergen County's most desirable communities