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• Jason Rabin, the apparel mogul who sold his company less than two months ago for $401 million, has now unloaded his duplex at 850 Park Avenue, too. Ten months after listing the five-bedroom, 5,600-square-foot apartment for $9.9 million, Rabin and his wife Nicole have sold it to Martha Stewart Weddings editorial director Darcy Nussbaum and her husband, attorney Andrew Nussbaum (left) for $6.225 million. [Cityfile]
• John McColgan and Moya Doherty, the husband-and-wife team behind "Riverdance," have sold their duplex penthouse at 1080 Madison Avenue, albeit for substantially less than they were hoping for when they first listed it for $10.5 million in July 2008. The four-bedroom pad sold for $5.85 million, or $4.65 million less than its original asking price. [Curbed]
Jay McInerney has paid $1.4 million for a two-bedroom Sag Harbor cottage, which he plans to use as a "writer's retreat" and "children's playhouse." [NYP]

• Michael Kasbar, the Miami, Florida-based chief executive of World Fuel Services, and his wife Mary, have paid $4.275 million for a two-bedroom apartment at 15 Madison Square North. [Cityfile]
• A three-bedroom apartment at 15 Union Square West has sold for $7.128 million, although the buyer's identity is a mystery for the time being. [Curbed]