• Former Morgan Stanley vice chairman Bruce Fiedorek has "quietly" put his fifth-floor co-op at 998 Fifth Avenue on the market for around $45 million. The 7,000-square-foot apartment, which was renovated by Stephen Sills and James Huniford and is one floor up from Len Blavatnik, is being listed by Kathy Sloane. [NYO]
• The sixth-floor co-op at 960 Park Avenue that belonged to the late Baroness Jacqueline de Gunzburg has gone into contract. It had been on the market most recently for $10.95 million. [Cityfile, Stribling]

• Sting has put his four-bedroom duplex at 88 Central Park West on the market for with Prudential Douglas Elliman's Claudine DeNiro for $26 million. Update: The listing has gone to Halstead's Mark Friedman, not Claudine DeNiro as per the Times. You can see more details of $19 million listing here. [NYT]
• Icelandic mogul Jon Asgeir Johannesson and his wife, Ingibjorg Palmadottir, have put the top two floors of their penthouse at 50 Gramercy Park North on the market for $25 million. [NYT, Corcoran]
• JPMorgan exec Adam Ansaldi has sold his three-bedroom apartment at 4 East 88th Street to Laurence Mascera, a managing director at Broadpoint Capital, for $3.299 million. [Cityfile]
• Condé Nast is selling off a company-owned apartment at the Promenade at 530 East 76th Street. The five-bedroom condo, which was typically occupied by Jonathan Newhouse when he visited New York, went into contract in late January. It had been listed in December for $4.995 million. [NYT, PDE]