I recently found the Victor Iron Works, which at some point at least fabricated cast iron store fronts. They are still in business to the present day.
Starting in a single building on 7th Street, they expanded to fill much of one half of the block.
On the other side of the alley, which Google Maps revealed has a catastrophically collapsed roof, is a Polar Wave warehouse, where ice was stored. Its beautiful terracotta sign is still preserved. How much longer will such valuable land sit dormant, I wonder?