The collection documents the life and activities of architect Arthur T. Sutcliffe. The collection is made up of four series: Personal Papers, Project Records, George L. Sutcliffe Papers, and Family Papers.

This small collection contains primarily Detwiller's student drawings, notes, course materials, books, class photographs, and graduation announcements from the period of his study at Columbia University from 1881 to 1885. These materials are supplemented by a small group of Detwiller's childhood sketchbooks, drawings and office papers created by Detwiller during his practice as a professional architect, and other scrapbooks and ephemeral items relating to Detwiller's family and personal interests, spanning the years 1874 to 1940.

Ernest Flagg was an American architect in the Beaux-Arts style. The collection is made up of diaries, correspondence, photographs, project records, Flagg's writings, and clippings.

Also, correspondence with Norman Bel Geddes, Monroe Biddle, John M. Blair, Harry T. Carman, Carolyn K. Christenson, Joseph S. Clarke, Jr., Thomas H. Creighton, Paul Cret, C.C. Cunningham, F.G. Fassett, Jr., Loring Dowst, John E. Harbeson, Oliver Hall, Jared C. Ingersoll, Gaylord P. Harnwell, William Fontaine Jones, Joseph Judge, William Lescaze, John D. Morse, William F. Paris, Charles E. Peterson, Ruth C. Roberts, Henry Shapiro, Oscar Stonorov, J.J. Sweeney, James M. Willcox, Owen J. Wister, Frank Lloyd Wright, Bruno Zevi, and others. This relates to proposed development of air rights over New York City's Pennsylvania Railroad Station, 1955; architectural projects in Pennsylvania relating to mental health, 1955; proposed new Independence Mall Building in Philadelphia, 1955; the 1954 Boston Art Festival Architectural Exhibit; sculpture committee on the design of the Ella Butt McManus monument, Connecticut, 1954-1955; the Philadelphia Saving Fund Society, building designed by Howe & Lescaze (with related memoranda, manuscripts of articles and talks, press releases, and architectural analyses), 1930-1939; and the Jefferson National Expansion Memorial, St. Louis (with related printed material, clippings, and photograph)

Collected by Jeanne Kleinfield Welcher (1923-2010), great granddaughter of Samuel Putnam Avery Sr. (1822-1905), this collection contains materials pertaining to the philanthropic efforts of the Avery Family during the late nineteenth and early twentieth centuries in the United States. The collection contains institutional documents, professional and personal correspondence, newspaper clippings, visual and research material, and personal affects pertaining to three generations of the Avery Family.

This collection includes one drawing, ink and wash on paper, of the Soldiers' and Sailors' Memorial; a drawing in ink and wash on paper of the Trenton War Memorial; and 17 drawings, graphite on tracing paper, of the Kemble Building, located at 15-25 Whitehall Street in Manhattan. Eight boxes of office records that include correspondence concerning buildings for the Goelet Estate, Cadillac Hotel, and Grant's Tomb, and a postcard to architectural renderer Hughson Hawley. Also included is a diary and an album of family photographs and architectural projects.

Max Gordon (1931-1990) was an internationally renowned architect who specialized in the design of galleries and exhibition spaces for modern and contemporary art. The collection is composed primarily of project files, architectural drawings, photographs, correspondence, legal papers, personal diaries, and student sketchbooks.

Also, minutes kept by Richard Michell Upjohn for the American Institute of Architects, New York Chapter, Committee for Library and Publications, 1868-1877, and Executive Committee, 1867-1889; sketchbooks, 1850s-1870s; photographs of Upjohn buildings and portraits of Richard Upjohn; correspondence, wills, memorial tributes, manuscripts, printed material, and miscellaneous personal and business documents; and several drawings by other architects including Alexander Jackson Davis, Hobart Brown Upjohn, and Calvert Vaux