1948 Sanborn Map of San Francisco -Castro St

21 x 25" folio map of the Castro street 17th st to 18th st section , indicating building construction and type of use.

Backside is 15th to 14th and Valencia, with the Projects in detail

Following the Sanborn Insurance process of color coded definitions to a great variety of construction methods, each attaining an underwriting specific to its design , liability through construction materials and land use . Hand cut overlays are created by the user to document the ever changing and monitored process of urban development through city building and planning departments and those plans filed by property owners with the city. Most popular and the final word in what was where and when , how it was made and who owned it. These issues were used by the city of San Francisco from 1948 until 1971 and reflect that industrial , Maritime city.