The Met Breuer was a museum of modern and contemporary art at Madison Avenue and East 75th Street in the Upper East Side of Manhattan, New York City. It served as a branch museum of the Metropolitan Museum of Art from 2016 to 2020.

945 Madison Avenue, also known as the Breuer Building, is a museum building on the Upper East Side of Manhattan, New York City. The Marcel Breuer-designed structure was built to house the Whitney Museum of American Art; it subsequently held a branch of the Metropolitan Museum of Art and from 2021 to March 2024 was the temporary quarters of the Frick Collection while the Henry Clay Frick House was being renovated. 945 Madison Avenue will next become headquarters to the international auction house Sotheby's.