• David Krell, who founded the International Securities Exchange and retired as the company's CEO in 2008, has paid $7.6 million for a 34th-floor apartment the Trump International on Central Park West. [Cityfile]
• I Trulli owners Astrid and Nicola Marzovilla have sold their six-story townhouse at 129 East 36th Street for $7.28 million. The buyer: The Republic of Chad on behalf of the Permanent Mission of the Republic of Chad to the United Nations. [Cityfile]
• Artist Robert Wilson has put his one-bedroom duplex at 3 Great Jones Street, where painter Mark Rothko once lived, on the market for $2.75 million. [WSJ]