About Mark Petheram

A dedicated Bellport resident and the distinguished broker/owner of Old Purchase Properties, Mark Petheram has been a cornerstone of the local real estate community for over 40 years. Referred to by Women’s Wear Daily as “the town’s go-to real estate broker,” Mark brings a level of experience, insight, and commitment that is unmatched in the area.

His passion for real estate began early—scouting locations for professional photo shoots—evolving into a career defined by deep market knowledge and a keen eye for Bellport’s architectural and cultural character.

Mark’s dedication extends far beyond transactions. He has served as president and vice president of the Bellport Chamber of Commerce and contributed to numerous village boards and local fundraising efforts. His long-standing civic involvement reflects his commitment to preserving and enriching the community he calls home.

An avid boater, Mark’s connection to the Great South Bay adds a distinct advantage when advising clients on waterfront properties, lifestyle opportunities, and the hidden value of Bellport’s coastal charm.

Whether buying or selling, those seeking guidance in Bellport’s real estate market consistently turn to Mark Petheram—a trusted advisor whose knowledge, integrity, and community focus have made him the region’s most respected name in real estate.