Architectural Documents are «papers, drawings, plans, letters, and other documents, either hard copy or digital, having to do with the construction of buildings, usually originating in an architect's office» ( Getty Art and Architecture Thesaurus).

Architectural Documents are a special category of Archival Materials. This category includes items coming from archives of architects who were involved in the design and construction of the Fair. Architectural documents has a dedicated section because these documents have unique cataloguing entries that are not shared with other types of archival materials.  More than 600 elements that belong to the Stefano Molli Archive (preserved at Fondazione Marazza of Borgomanero, Italy) are collected here.