The William Muschenheim collection spans from 1929 to 1957, with bulk dates from 1931-1950. The collection documents approximately 130 separate jobs and is made up of architectural drawings, correspondence, accounts, estimates, specifications, invoices, contracts, samples, invoices, and other material related to Muschenheim's professional projects. 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.