Proceeds from sale of 150 works owned by the late billionaire Paul Allen will go to charity

The vast private art collection of the late Microsoft co-founder Paul Allen is expected to fetch a record-breaking $1bn (£890m) when it is auctioned next week.

The collection of more than 150 masterpieces includes Georges Seurat’s Les Poseuses, Ensemble (petite version) and Paul Cézanne’s landscape La Montagne Sainte-Victoire, which are both expected to sell for more than $100m, and Gustav Klimt’s 1903 work Birch Forest, which has an auctioneer’s estimate of $90m.