Sotheby's is preparing to offer the Blaquier collection of Impressionist and Post-Impressionist art, an ensemble carrying a combined estimate of about $450 million. The sale, reported on 30 September, would place the Argentinian family's holdings among the most valuable single-owner collections ever to come to auction. The standout lot is Vincent van Gogh's Pink and white flowering chestnut tree, painted in 1890 and estimated at $150–200 million. Also announced is a work from Paul Cézanne's Harlequins series that could be valued at more than $120 million, alongside works by Edgar Degas, Camille Pissarro and Pierre-Auguste Renoir each expected to carry estimates above $25 million. The sale follows a turbulent chapter in the collection's history. The Blaquier family had earlier sold Van Gogh's Zouave, painted in 1888, privately through Christie's for around $190 million. In 2023 Argentine customs authorities sanctioned the family over the export of around a dozen paintings to Luxembourg; the case was closed in July 2026, clearing the way for several of those works to be included in the Sotheby's offering. Founded in London in 1744, Sotheby's has handled a string of landmark single-owner sales, including the David and Peggy Rockefeller collection, which reached $835 million in 2018, and the Paul Allen sale of 2022, which totalled $1.62 billion. The main image accompanying the report is Van Gogh's flowering chestnut tree, courtesy of Sotheby's. For Sotheby's, the consignment continues a strategy of courting single-owner sales whose provenance and scale generate global attention — a strategy that has repeatedly reset auction records over the past decade.