The collection contains 290 drawings by American architect William Gehron for projects in the New York area. Projects represented are: Queens Borough Hall, 1939-40 (74 drawings); P.S. 191, 1952 (25 drawings); Convalescent Day Camp, Welfare Island, 1937 (15 drawings); Micellaneous Housing Projects, 1935 (25 drawings); Proposed Plaza for Broadway and 122nd Street, 1936 (1 drawing); World War II Memorial in Watermill, Long Island, NY, 1950 (6 drawings); Harlem Hospital OPD, 1939 (77 drawings); Studies for MacDonald Observatory, 1931 (28 drawings); and Utica State Hospital, 1949 (41 drawings). An rendering by Hugh Ferriss of the State Educational Building and Memorial Pylons in Harrisburg, PA was donated in 2004 (acq. 2004.005).

This collection contains primarily project records, including drawings, files, specifications, correspondence, and photographs, related to the architectural practice of William & Geoffrey Platt. Projects including commercial, institutional, and residential buildings located in Colorado, Connecticut, Delaware, Florida, Louisiana, Massachusetts, Maine, North Carolina, New Jersey, New York, Ohio, Pennsylvania, Virginia, Vermont, Washington, and France. The firm was involved in the design of many buildings and additions for institutions such as the Pierpoint Morgan Library, Princeton University, Smith College, and Deerfield Academy.

This collection contains original drawings for thirty-nine architectural commissions, dated from 1913 to 1946. The majority of projects were located in New York City; other locations include the District of Columbia, Pennsylvania, South Carolina, and Virginia. Projects with the greatest number of extant drawings include River House in New York City (1930-1931); the Ernest P. Davies residence in Roslyn, New York (1916); the William Goadby Loew residence in Old Westbury, New York (1931-1932); and the Robert Goelet residence in Georgetown, South Carolina (1935). Drawings are primarily done in graphite on tracing paper, with some in ink on drafting linen.

Watercolor drawings of interior walls and ceiling designs, late nineteenth-century, probably American.

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

The Woodlawn Cemetery archive documents the history of the grounds, mausolea, monuments, and operations of Woodlawn Cemetery, founded in 1863 in The Bronx, New York, and one of the largest in the United States. The collection includes architectural designs records, maps, photographs, correspondence, construction and maintenance records, and other historical documents, spanning 140 years of the cemetery's operations.

Architectural drawings for projects designed by the firm. The drawings, mostly blueprints, documents Allegheny General Hospital, Pittsburgh, Pa.; Mountainside Hospital, Glen Ridge, N.J.; The Department of Commerce Building, Washington, D.C.; The New York Academy of Medicine, New York, N.Y.; Federal Reserve Bank of New York, New York, N.Y.; and University of Michigan, Ann Arbor, Mich.