This seems like it would be helpful to a DM: Insurance maps of New York in the 1920s: https://www.loc.gov/item/sanborn06115_003/ Maps of what type of buildings are in each neighbourhood, loctions of fire stations and similar, and then indexes of warehouses and more detailed views of neighbourhoods.

Check out the similar items list at the bottom; They have them for other cities and years it looks like.

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