Over the next 65 years, as the size and scope of the exhibitions expanded, the limitations of the Museum's galleries, storage, and support areas became apparent. In 1976, Maine native Charles Shipman Payson promised the Museum his collection of 17 paintings by Winslow Homer. Recognizing the Museum's physical limitations, he also gave $8 million toward the building of an addition to be designed by Henry Nichols Cobb of I. M. Pei & Partners.