Deeded keys to Chilmark's private beaches have become six-figure assets, with Hancock Beach access selling for $650,000 last year as luxury demand outpaces a fixed supply of shoreline lots.
Deeded keys to Chilmark's private beaches have become six-figure assets, with Hancock Beach access selling for $650,000 last year as luxury demand outpaces a fixed supply of shoreline lots.

A key that unlocks a private stretch of Martha's Vineyard shoreline sold for $650,000 last year, while a Quansoo Beach key climbed from $200,000 in 2003 to $475,000 as wealthy buyers bid up scarce beach access on the Massachusetts island.
"There's more demand than supply. Prices reflect that," said Alexis Holden, an agent at Tea Lane Associates who has two clients who have waited more than a year for the chance to buy a Chilmark beach key.
The keys convey deeded ownership of a sliver of non-buildable beachfront and entry to secluded shoreline that is off-limits to the public. Roughly 40 beach lots have sold since 2019, according to Tea Lane's Abby Rabinovitz. A Black Point Beach key cost $310,000 in 2016, property records show. Some keys carry rules barring resale entirely.
The escalation tracks a broader surge in island property values. A Herring Creek Farm home recently sold for a record $43 million, and Tyler Smith, an 84-year-old retired architect, listed his 46-acre Chilmark property for $16 million in May — with his beach key, valued at $450,000 to $475,000, included in the offering.
Scarcity by design
The key system emerged decades ago when families who owned large swaths of oceanfront farmland divvied up beach lots and sold strips of land to neighbors and friends. Massachusetts is one of the few states that permits private beaches. With 124 miles of shoreline, Martha's Vineyard has more than two dozen public and private beaches, plus town beaches restricted to residents.
Key beaches aren't necessarily more scenic than public ones, Rabinovitz said, but the draw is seclusion, quiet and guaranteed parking — amenities that public beaches, often crowded with summer visitors, cannot offer. Some beach associations issue new keys each summer to prevent too many from circulating.
David Heilbroner, a 69-year-old filmmaker who inherited a key to Hancock Beach, said he brings his dogs for long walks there and rarely encounters another person. "It's as if time and development never happened," he said.
For keyholders, the asset functions as a form of stored social capital. Lisa Herrick, a clinical psychologist based in Washington, D.C., inherited a key to a beach in Aquinnah from her parents. She and her husband paid $740,000 for a three-bedroom house on the island in 2016. Having the key, she said, gave them "the freedom to be anywhere" on the island when they chose a property.
A widening divide
The price escalation has sharpened tensions between year-round residents and wealthy second-home owners. Julie Flanders, a 13th-generation Vineyarder and real-estate agent whose family has held a key to Goff Beach in Aquinnah for generations, acknowledged the optics. "It seems elitist maybe," she said, but the small island absorbs a crush of summer visitors. "It's just management of traffic flow."
Mike Peters, a retired National Grid worker from Albany, New York, who has rented on the island every summer since the 1990s, said he could never afford to buy a place or key of his own. "For the common people, you just visit and go home. You can't own a piece of it."
Heilbroner, a past president of the Hancock Beach Association, said he is both deeply appreciative and uncomfortable that he has access to a pristine beach while others don't. "The starting line for everybody isn't equal," he said. "Rich people can get a private beach and others can't."
The market's persistence suggests the divide will widen. Heilbroner noted that buyers routinely build $20 million houses on the island, making a $600,000 beach key "closer to a rounding error." With roughly 40 lots sold since 2019 and buyers waiting more than a year for an opportunity, supply constraints show no sign of easing — even as the island's coastline erodes and beach associations buy up adjacent land as a bulwark against the disappearing shoreline.
This article is for informational purposes only and does not constitute investment advice.