Ever since Rachel "Bunny" Lambert Mellon died in March at the age of 103, the art world has been wondering what would become of the vast treasures of art and objects that she and her husband, Paul Mellon, had collected and lived with.

On Tuesday, Sotheby’s announced that it had landed the sale of the estate of Mrs. Mellon, winning it over its rival Christie’s. The auctions, starting in November, will be among the most highly anticipated sales from a fabled family collection, with more than $100 million of art, jewelry, furniture and decorative objects. Proceeds will benefit the Gerald B. Lambert Foundation, a charitable entity established by Mrs. Mellon, known as Bunny, in memory of her father.