Image set two: San Francisco Business Registration patterns. Data from 2Q 2014, recoded by Fall Line Analytics. Four maps (click to enlarge): Old and new businesses; The tourist economy; Service Industry; and Retail. This includes all registered businesses - note the different neighborhood patterns. Source: San Francisco Treasurer's Office.
Image set one: San Francisco Assessor Lots colored by building age. Three maps (click to enlarge): all lots, detailed; all lots, simple; and post-earthquake construction lots. This is an historical guide to construction in San Francisco. Source: Data SF and the San Francisco Assessor's Roll, 2013.