The Sterling and Francine Clark Art Institute opened Stone Hill Center, designed by Tadao Ando, on June 22, 2008. Located on a wooded hillside, Stone Hill Center houses two new galleries in which the Clark will present exhibitions highlighting its collection as well as works representing periods and cultures not currently shown at the Clark. A terrace affords magnificent views of the Taconic Range and Green Mountains, and a new network of scenic trails and walking paths integrates the building into the landscape.

Stone Hill Center also houses the Williamstown Art Conservation Center (WACC), the largest regional conservation center in the country. WACC treats objects ranging from historic artifacts, antiques, and heirlooms to some of the most important paintings, watercolors, drawings, photographs, sculpture, and furniture in the United States. Well-known works of art conserved at WACC include Vincent van Gogh's Irises, Thomas Hart Benton's America Today murals, and Jackson Pollock's Number 2, 1949.