This collection contains architectural records, student work, correspondence and professional writings related to the academic and architectural practice of Walter Sobotka. The largest portion of the collection, Series 1, relates to his architectural practice and contains drawings, files, and a scrapbook of photographs and articles pertaining to his work in Europe and America. The majority of his projects consisted of residential buildings and interiors in Austria along with furniture designs. However, there is also a selection of theater interiors that Sobotka designed for RKO across the United States. Series 2 contains a limited selection of Sobotka's lectures and writings, as well as correspondence. This series also contains material relating to two of his unpublished writings, The Prefabricated House and Principles of Design, including copies of the manuscripts, correspondence with publishers, and research materials. A bound version of Principles of Design is catalogued separately and contains an appendix in which Sobotka translated into English excerpts of his correspondence with the Viennese architect Josef Frank. Series 3 contains some artwork and student drawings, as well as a few personal letters.

This collection contains architectural photographs, drawings and records related to the architectural projects and designs of Warren and Wetmore, principally in the United States, but also representing commissions in Canada, Cuba, and Puerto Rico. Unfortunately, the bulk of architectural drawings produced by the firm are no longer extant. Additionally, it holds a variety of photographs and other records used as reference materials in the course of Warren and Wetmore's professional work. Lastly, a small group of student and personal papers and photographs from Whitney Warren completes the collection.

Architectural drawings, correspondence, accounts, estimates, specifications, invoices, contracts, samples, invoices, and other material related to William Muschenheim's projects. The William Muschenheim Architectural Drawings and Papers span 1929-1957, with bulk dates 1931-1950. Muschenheim's papers document 130 separate jobs, and the visual material (described in RLIN VIM), consists of 3081 sheets of drawings. The projects mainly represent Muschenheim's work in New York City, but also include work in Albany (NY), Amenia (NY), Bridgehampton (NY), Chappaqua (NY), Hampton Bays (NY), Malverne (NY), Massapequa (NY), Nassau Point (Long Island), Washington (CT), Washington DC, Westhampton Beach (NY), and Woodstock (NY), among other locations. William Muschenheim also had numerous clients which included the following family members: Carl Muschenheim, Elsa Muschenheim, and Frederick A. Muschenheim. In addition to the many clients for whom he did alteration work, Muschenheim also worked with a wide variety of companies including Bigelow Carpet Company, C.G. Flygare Inc., Excel Metal Cabinet Co., F. Schumacher & Co., Famaes Development, Hans Knoll, Howard & Schaffer, Inc., Kurt Versen Lamps, Inc., Ledlin Light Designers, Portland Cement Association, and Thonet Brothers, among many others