Perched on the crest of Chatfield Hill, the highest point in Sag Harbor Village, sits "Harborview"-an award-winning modernist retreat with incredible pedigree & unbeatable big water views. From this secluded vantage point, the home offers a breathtaking view of Sag Harbor Bay, capturing the shifting blues of the water and the golden transit of the sun, all from a jaw-dropping mid-century masterpiece unlike anything else in the Village. Originally envisioned by architect Bob Gilchrist as a "glass house" pavilion, the residence is a study in the harmony of opposites: texture and light. The 3,000+/- sq. ft. interior is a continuous gallery of light, where soaring mahogany ceilings, finished in a luminous white, float above pale floors and original marble walls. The spirit of the 1960s "Ultramodern" movement has been meticulously curated for the contemporary eye. There is floor-to-ceiling glass everywhere, including the stunning primary suite and 3 guest bedrooms surrounded by green specimen gardens. The heart of the home is an expansive great room anchored by a signature concrete fireplace, where massive windows invite the bay views inside as a living work of art, basking in the glow of the five original skylights. The water views continue from the expansive dining room and chef's kitchen, recently renovated with cool blue handmade cabinetry that vibes with the original architecture. This is a house that breathes; a space celebrated by The New York Times for its effortless cool. A highlight: down a striking open staircase, find a killer lower den & entertainment zone, with a wet bar & separate bath in black marble. The transition to the outdoors is seamless: the heated pool and tiered lounging areas are framed by mature greenery and original breeze block walls, offering a secluded theater for viewing the vibrant harborfront sunsets. Other features include a circular drive with a two-car attached garage and a large storage space ready to be reimagined as a chic media lounge or library.