• Citigroup general counsel Michael Helfer (left) and his wife Ricki Tigert Helfer, a former FDIC chair and fellow at the Brookings Institution, have sold their apartment at the San Remo on Central Park West. The eighth-floor co-op, which first went on the market in March for $3.195 million, sold last week for $2.995 million. [Cityfile]
• Philippe Weissberg, a managing partner at Madison Capital, and his wife Rosita have sold their three-bedroom co-op at 21 East 87th Street for $3.225 million. [Cityfile]
• Ariel Cohen, an executive VP at Prudential Douglas Elliman, has convinced five of his neighbors at 15 Broad Street to put their apartments up for sale along with his own. A buyer now has the option of turning them into a massive, 9,500-square-foot spread with eight bedrooms. The most expensive listing in the financial district, the mega-pad is listed for $22.5 million. [Real Deal, PDE]

Sam Mendes turns 43 today. Rapper (and now radio host) Chuck D. is 48. Other folks celebrating: Al D'Amato is 71. Model agency owner Scott Lipps turns 39. Hairspray's Ashley Parker Angel is 27. Hedge fund honcho Ray Dalio is 59. Real estate agent Elizabeth Stribling is turning 64. Adam Duritz is turning 44. Most importantly, Coolio celebrates his 45th today. Celebrating tomorrow: Mary Louise Parker will be 44. Jeffrey Kalinsky will turn 46. NRDC president Frances Beinecke will be 59. And financier Henry Silverman will celebrate his 68th. On Sunday, Martha Stewart will celebrate her 67th with what we're guessing will be a meticulously planned party. Other Sunday celebrations: art world staple Adam Lindemann, Tom Brady, Isaiah Washington, and Martin Sheen.