The silkscreen-on-canvas portrait, which will be displayed in the city's main convention center starting in late May, is expected to bring in up to $120 million in a private sale.
The Al-Thanis' purchase of Mark Rothko's "White Center (Yellow, Pink and Lavender on Rose)" (1950) set an auction record at Sotheby's New York last May for the highest price ever paid for a work of postwar art.
Ten works from the thousand-piece collection of Gustav Rau, the late doctor and art collector with memorably idiosyncratic taste, will be auctioned off at Sotheby's London on July 9.
May 16, 2008 
