
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. Real Trends has confirmed that in 2024, he holds the 4th position in the Hamptons for individual sales volume. 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 one who attends the Ross School and the other who attends Cornell University.

Mark Greenwald
Licensed Associate Real Estate Broker
Mark was responsive from the outset — a 9:30pm online inquiry received a reply within 30 minutes.
Within a week, a Saunders contract was signed, photos were taken, staging was completed, and the house was listed.
But here's the differentiator: Mark personally conducted all the broker showings, bypassing open houses entirely - which had proven to be a complete waste of time in our earlier experience. After each showing, we received timely, detailed feedback. We always knew where we stood.
We had total confidence in Mark's ability to find the right buyer and negotiate professionally on our behalf. He delivered, and we couldn't be happier with the result. He didn't just sell our home; he made what is typically a stressful process feel effortless.
If you're looking for a broker who is responsive, strategic, and genuinely invested in your outcome, look no further.
-Zillow User
- Stephen Budow
"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
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
