Sotheby's chairman of contemporary art, Grégoire Billault, believes the Basquiat piece, among others, will be highly ...

The 1981 painting-unseen for over three decades-is estimated at up to $15 million, topping a week of high-stakes sales ...

A René Magritte sketch that was bought over eBay for only $1580 is expecting to fetch over $100,000 in an upcoming auction.