A Cutchogue mansion sold for $11.2 million last week, setting a record for the most expensive single-family home sold on a single lot on the North Fork, in what experts say is a sign of the strength of the region's luxury market.

The 7,500-square-foot shingle-sided mansion formerly belonged to the late art dealer Barbara Gladstone, who represented artists including Robert Rauschenberg, Keith Haring and Elizabeth Murray, according to the real estate agents involved in the transaction.

The six-bedroom house sits on 1.2 acres and has 140 feet of frontage on Peconic Bay with its own private beach.

"This sale was really driven by the quality of the beach," said Bridget Elkin, a real estate agent at Compass in Southold, who listed the property with her husband, Eric Elkin.

The deal eclipses

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