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• Morgan Stanley CEO John Mack and his wife Christy appear to be the mystery buyers behind last month's purchase of the limestone carriage house at 165 East 70th Street. The 107-year-old home, which was sold to Mack in "distressed condition" for $13.5 million—and which comes with a 12-car garage, believe it or not—was purchased from Bunny Mellon, the 99-year-old widow of philanthropist Paul Mellon. [NYO]
• Sandy Gallin, the Hollywood talent manager-turned-serial house flipper, is at it again. The onetime manager of stars like Michael Jackson and Barbra Streisand, Gallin has placed his 14-acre estate in Bridgehampton on the market for $32 million. [WSJ, Saunders]
• Steve Black, co-CEO of JP Morgan's investment banking division, has sold his estate in Greenwich for $18.9 million. The English-style mansion, which Black bought for $13.75 million in 2001, had been "quietly" on the market for $21 million. The buyer is believed to be to be investor Gerhard Andlinger. [WSJ]

• Donald Opatrny Jr., a former partner at Goldman Sachs, has sold his 13,500-square-foot mansion in Greenwich for $18.7 million, which is 22 percent less than its original $23.9 million asking price. [WSJ]
• The former home of late abstract painter Judith Rothschild at 1110 Park Avenue is available as a rental. The 5,100-square-foot townhouse is currently being offered for $18,000 a month. [Real Deal, C210]
• The penthouse triplex at Julian Schnabel's Palazzo Chupi has been taken off the market. After a series of dramatic price cuts, the 3,713-square-foot pad had been priced most recently at $14.95 million. [Real Deal, previously]