Real Estate Agent
For two decades, Mark Greenwald consistently ranks as a top producer in Hamptons real estate, using his winning strategy to match clients and customers with their perfect property and expertly brokering deals to a successful transaction. He is ranked in the top .05% in the U.S. by sales volume as published in The Wall Street Journal. Over his 20+ year career, Mark has earned a reputation for dedication and due diligence, skillfully guiding customers through the process of finding and negotiating for their Hamptons home. He is known for his intimate knowledge of Southampton Village.

Mark comes from a prestigious legal background, which gives him a unique and powerful skill set for brokering a real estate deal. Mark holds an undergraduate degree from Cornell University as well as a JD from Cornell Law School. He worked as a real estate attorney with two high-profile New York City law firms—Fried Frank and Schulte, Roth & Zabel.

Throughout his career Mark has worked with individual customers as well as developers, using his wealth of knowledge to advise on buying and selling properties, as well as advising on building and zoning laws for investors that are looking for opportunities and for sellers looking to highlight advantages their property offers. His business background gives him a valuable perspective in assessing a Hamptons home's enjoyment value as well as its importance as an investment.

As the Chairman of the Southampton Village's Zoning Board of Appeals, Mark understands and can advise immediately on the expansion of an existing residence, additional accessory structures, or other development options.

Mark takes a hands-on sales approach to every property he represents, personally attending each showing and providing crucial feedback. Together with Saunders & Associates' unsurpassed marketing resources, Mark's exhaustive market research is an immediate asset to his clients and customers. His experience, negotiating skills, and legal acuity place him in the enviable position of bringing each deal to fruition even in challenging markets.

Mark lives in Southampton Village with his wife and two children who attend the Ross School.

Mark Greenwald

Licensed Associate Real Estate Broker
Fax: (631) 204-6823
14 Main Street
Southampton, NY 11968
14 Main Street
Southampton, NY 11968

"My professional standards are high and Mark met all of them: Mark’s knowledge of the real estate market, building construction standards and zoning requirements is outstanding. There are a lot of brokers out there but few with the same level of professional expertise as Mark. We are very happy with our purchase of a house in Southampton Village. The house was under construction at the time we went to contract and Mark was able to guide the process from purchase to closing in a highly professional manner, always available and always able to do whatever needed to be done to keep the transaction moving forward. I would recommend Mark as a real estate broker to anyone considering a sale or purchase in the Hamptons. "

From Zillow


Mark’s professional expertise and guidance enabled us to purchase a wonderful home in Sag Harbor, despite the challenges of finding and successfully negotiating for a house during a pandemic. Mark made the whole experience of purchasing a home as enjoyable as it should be; working with an experienced, caring broker like Mark is the key.

From Zillow

We cannot speak highly enough of Mark as our real estate agent in purchasing our home in East Hampton. His professionalism, honesty, integrity, extensive market knowledge and calm demeanor was greatly appreciated by us. He listened to us and knew exactly what we were looking for, and he wasn’t afraid to tell us that a particular property wasn’t a good value or wouldn’t be a good fit for us. The home we ended up buying, with Mark’s help, is perfect for us in every respect. We would not hesitate to recommend Mark to anyone looking to buy or sell a home in the Hamptons. You will definitely be in good hands with Mark!
Denise Clolery

Working with Mark was a pleasure as we knew we would be able to find the right house for us and are very happy with our purchase of a brand new construction house on a beautiful property in Water Mill, fitting all of our criteria and objectives. The house was under construction when we went into contract and Mark was able to help guide us through the process. We looked at many houses prior to making our decision, with Mark listening carefully to our feedback and tailoring our search to match our preferences as our preferences crystallized during the process. Mark has an excellent knowledge of the market and is a pleasure to work with.

From Zillow


With Mark’s guidance my family and I found our dream home! He helped us swiftly negotiate a fair contract which was executed seamlessly. He remained honest and accessible throughout the entire process. Since our closing Mark has remained a valuable resource.

From Zillow


My husband and I are very happy that Mark helped us find the right house at the right time in the Village of Southampton. We appreciate Mark’s extensive knowledge of the local real estate market and his ability to help us through the process of buying a home under construction and helping to negotiate the successful completion of the home, meeting all of our hopes and expectations, as well as making the process as much fun as the end result. We are very happy with our purchase and with our experience working with Mark as a professional and steady guide.

From Zillow

amy cushmaro