This map aligns and merges several historical fire insurance and real estate atlases into a single zoomable map, in the hope that it will be useful and edifying. The maps detail the explosive growth of Seattle between 1884 and 1908, with enough detail to show individual buildings.
Scanned images of the Sanborn maps are hosted online by the Library of Congress:
Scanned images of the Baist's Real Estate Atlas of Surveys of Seattle are hosted on Paul Dorpat's site
All images are in the public domain. I'm very grateful to the Library of Congress and Paul Dorpat for hosting high resolution scans of these fascinating documents.
I did; I'm Brandon Martin-Anderson. Processing consisted of the following steps: