The records consist of drawings, photographs, correspondence, and administrative and design files associated with the 1977 expansion and renovation of The Museum of Modern Art, as well as other buildings designed by Cesar Pelli and Pelli Clarke Pelli Architects. Also included are project descriptions and fact sheets, press clippings, marketing materials, files documenting buildings designed by Cesar Pelli before he incorporated his own firm in 1977 and other administrative records documenting Cesar Pelli and Associates projects between 1977 and 1979.