Banker Sells on East 80th; Big Buy at One York

• Tom Flexner, a former vice chairman of Bear Stearns who joined Citigroup in April of 2008 to oversee its global real estate investment banking business, has closed on the sale of his four-story townhouse at 136 East 80th Street. The three-bedroom home, which Flexner first listed for $12 million last July with broker Kirk Henckels, and which went into contract to sell in May, sold to one Regan Fitzpatrick for $8.3 million. [Cityfile]
• Real estate investor Michael Hirtenstein has paid $16.8 million for five units on three floors of the Enrique Norten-designed One York, which he's planning to combine and use as a place to host "philanthropic events." [NYP]

• Hotelier Henry Kallan and his wife Emilia paid $2.995 million for a co-op at 45 East 89th Street in April. Now they've sold their old apartment in the same building. The 35th-floor pad sold for $3.050 million. [Cityfile]
• Jewelry designer Melissa Sohn and her husband Joshua have sold their three-bedroom apartment at 300 East 59th Street for $1.215 million. [Cityfile]
• The official listing for Bernie Madoff's Montauk house is now on the Web. The four-bedroom home located at 216 Old Montauk Highway has been listed by Corcoran's Joan Hegner and Raymond Hegner for $8.75 million. [Real Estalker, Curbed, Corcoran]