The auction's results underscored the risk of seeking quick gains in the opaque art trade.
Auction houses increasingly turn to third-party investors to place prearranged bids on expensive artwork.
The two modern artworks are thought to be worth in the neighborhood of $6 million.
The previous auction record for Monet was $84.7 million, for one of his water lilies works.
Artwork based on "The Simpsons" TV show was among the items at a Sotheby's auction in Hong Kong.
That's how much rich New Yorkers are paying to have their children groomed to win admission to Ivy League schools.
A canvas of President John F. Kennedy made shortly after his assassination is going up for auction.
Art collectors and celebrities attended the inaugural day of the art festival.
Rockefeller served 69 years on MoMA’s board, starting in 1948, until his death at age 101.
Richard Feigen, 88, has sold paintings to moguls and museums over six decades.