• Cynthia Nixon and her fiancée, education activist Christine Marinoni, have picked up a new weekend home: The couple are putting down $1.7 million for a 1,400-square-foot waterfront cottage in Montauk. [Newsday]
• Investment banker Lewis van Amerongen has gone into contract to sell his five-story townhouse at 13…

• Investment banker Lewis van Amerongen has slashed the price of his five-story townhouse at 13 East 71st Street. First listed last September for $24.95 million, the 8,766-square-foot manse (left) can now be yours for $16.95 million. [Cityfile, BHS]
• Jason Klarman, the general manager of Oxygen Media, paid $2.21…