Sanborn maps date back to the 1860s and were created as a detailed building record by the Sanborn Fire Insurance Company. They are large scale (50 feet to the inch) and highly detail and include such information as building location, construction materials, and building height.
The latest print edition of Sanborn maps for St. Louis can be viewed in the Art and Architecture Library Reference Section. Use the available street index to locate the volume and page for your area of interest.
Older paper editions of the Sanborn Maps are held in the West Campus Library.