The Charles Shipman Payson Building is the most recent expansion of the Portland Museum of Art (PMA) in Portland, Maine, located on the corner of High Street and Congress Square. Henry N. Cobb (of Pei Cobb Freed & Partners) designed the Payson Building, which introduced over five times more gallery space than in the adjacent, historic PMA buildings (McLellan-Sweat House, Charles Quincy Clapp House, and L. D. M. Sweat Memorial Galleries). The building opened in 1983, after Mr. Payson donated 17 Winslow Homer paintings and ten million dollars to the museum.