Set on 2.1 acres abutting the protected Long Pond Greenbelt

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Home For Sale

78 Round Pond Ln

Sag Harbor, New York 11963

Suffolk County

Community: 

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$4,495,000 4 br, 5.0 bath 4195 sq. ft. 2.110 acres

Set on 2.1 acres abutting the protected Long Pond Greenbelt, this 4,195-square-foot modern estate offers a rare blend of architectural sophistication and natural serenity, just minutes from Sag Harbor Village. With 4 bedrooms and 4.5 bathrooms, the home is anchored by a dramatic double-height great room, where walls of floor-to-ceiling glass frame the surrounding landscape and a Belgian wood-burning fireplace serves as both a striking focal point and an efficient whole-home heat source. Designed for seamless living and entertaining, the main level flows effortlessly from the great room into a professional-grade kitchen featuring an oversized waterfall island, and into a dedicated dining area that opens directly to the outdoors. Thoughtful amenities enhance the experience, including an en-suite guest bedroom, private home theater, and a fully equipped gym. Upstairs, the layout is intentionally divided into two wings for optimal privacy. The primary suite occupies its own side, complete with a walk-in closet, spa-inspired bath, and private terrace overlooking the grounds. Opposite, two additional en-suite bedrooms provide comfortable accommodations for family or guests. The outdoor setting evokes a private resort, centered around a heated gunite pool with integrated spa and waterfall. A well-appointed pool house includes a kitchenette, infrared sauna, and outdoor shower, while the landscaped grounds feature an irrigated garden, fire pit, and expansive bluestone patios. A detached garage completes the property. Beyond its design and amenities, the home is built for lasting performance, with a four-zone HVAC system with ionic air scrubbers, a triple-stage water filtration system, and a full-property generator. A truly turnkey offering in one of Sag Harbor's most naturally preserved settings.

Interior:
  • Bedrooms: 4
  • Baths: 5.0
  • Sq Ft: 4195
  • Year Built: 2016
  • Utilities: 
  • Fireplaces: Has Fireplace
  • Stories: 
  • Heat/AC: Fireplace(s)
  • Garage: Garage
Exterior:
  • Lot Size: 2.110 acre
  • Lot Dimensions: 
  • View Types: 
  • Yard: 
  • Siding: 
  • Roof: 
  • MLS #: 11694294
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Contact Information:
Beach Home For Sale in Sag Harbor, New York
Listing Agent: Matthew Breitenbach, Compass, 212-913-9058, 212-913-9058 Listing Site, Listing Status: Active
Copyright © 2026 My State MLS. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.
Ad Number: 7591299
Viewed 20 times.
Updated: Apr 27, 2026

This property is a Home located at 78 Round Pond Ln, Sag Harbor, New York 11963, and is currently For Sale at $4,495,000. This Home has 4 bedrooms, 5.0 baths, 4195 sq ft.