Telegraph on D'Offay Artist Rooms: Koons April 23, 2009 by Marion Maneker More from Art Market MonitorArtist Slaps CongressmanGagosian to Open in San Francisco Near SFMoMA, Berggruen Next DoorSotheby’s Buys Art Agency Partners for $50m + $35m PerformancePhillips to Sell Late Judd Stack Without ReserveSotheby’s to Change Buyer’s Premium Before November SalesThe Case of the Barnes