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The Sanborn Map Company helped fire insurance companies set rates in the late 19th and early 20th centuries with these detailed maps of each built structure, its use, dimensions, height, building material, and other relevant features (fire alarms, water mains and hydrants, for example).
Changes to the names of certain streets, alleys, and courts were first effected by an ordinance dated September 1, 1858. A provision of this ordinance was an alphabetical index of former names, together with the location of the street and the new name given to it. By an ordinance of February 23, 1897 names of intermediate streets were indexed by old name, location and new name.