The late, influential art-world power broker Barbara Gladstone’s Gilded Age waterfront retreat — one of the last intact turn-of-the-century shingle “summer cottages” on Long Island’s North Fork — is for sale for $12 million

The sale of the property presents a unique opportunity to purchase a ‘turnkey’ Gilded Age mansion which has undergone a multi-million-dollar restoration and is being sold alongside all of its furnishings, including antiques and artwork.