• 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…

• Pro golfer Vijay Singh and his wife, Ardena Seth, are paying $5.675 million for a penthouse duplex at 55 West 59th Street. The 3,369-square-foot pad was listed in June for $6.9 million. [Real Deal]
• Joan Raines has closed on the sale of her late mother's townhouse at 5 East 78th Street, albeit for a lot less than…

• Albert Hammond Jr.'s East Village apartment has gone back on the market. Hammond originally listed the two-bedroom pad at 141 East 3rd Street for $1.199 million last August, and went into contract to sell it before the buyer dropped out. He later re-listed it for $999,000, but then took it off the market…