Baist's Real Estate Atlas of Surveys of Denver 1905, Plate 9 and Sanborn Map Company Insurance Maps of Denver 1930 updated to 1961

Real Estate and Sanborn Fire Insurance Atlases
These show Denver structures as early as 1887 and will help you to date the construction of a building and give you a picture of neighborhood development. We have a large selection of Baist's Real Estate maps digitized and available in our collections online. When using the early maps and atlases, remember that many streets have had several different names over the years.

Robinson's Atlas of the City of Denver 1887, Plate 8

Legal description
These atlases will also show the legal description of your property - Addition name, Block number, and Lot number(s). You will need this in order to try to locate an original building permit and/or trace the chain of property ownership.