Centerbrook Architects, Centerbrook, Conn., is expanding and restoring the historic Addison Gallery of American Art on the Phillips Academy campus in Andover, Mass. Designed in 1930 by Charles Platt, the gallery houses one of the most important collections of American art in the country, with work by George Bellows, John Singleton Copley, Thomas Eakins, Winslow Homer, Georgia O’Keeffe, and Jackson Pollock. Chad Floyd, FAIA, is Centerbrook’s partner-in-charge. The architect’s design work on the existing structure will restore the exterior skin and the interior spaces while seamlessly introducing modern systems of climate control, security, lighting, technology, and utilities. Staff offices now intermingled with first-floor galleries will move into a new, 11,800-square-foot, three-story expansion, thus returning the historic galleries to Platt’s original concept. The simply elegant glass-box addition, sheathed in stainless-steel mesh and sitting atop a brick-wall base, foils and enhances Platt’s Greek Revival temple. The expansion will house back-of-house spaces on the ground floor, a new Museum Center on the first floor, and the staff offices on the second floor. Currently under construction, the gallery is slated to reopen in spring 2010. (Rendering courtesy of Centerbrook Architects. View plans for the Addison Gallery project in This Week in Pictures.