The Society's architectural collections include drawings, blueprints, renderings, photographs, correspondence, and business records. Most significant are its large holdings for individual architects or firms, including (in chronological order) John McComb, Jr.; Calvin Pollard; Alexander J. Davis; John B. Snook; George B. Post; McKim, Mead & White; and Cass Gilbert. These architects were all active in Manhattan and New York City buildings predominate, but their work includes many structures outside the city. More than 150 other locally and nationally prominent architects and engineers are also represented, generally by 10 or fewer drawings.