Update: Readers helped identify this plant as having once been owned by Pfizer and that it once produced pigments. While it may have been operational in 2012, when this post was originally made, as of 2021, it is almost certainly abandoned.
I continued down the hill and entered a neighborhood off of St. Clair Avenue. I can imagine a century ago, men would walk these sidewalks from nearby houses, and work in the factory.
I have no idea what the factory was, or when it closed, but the relatively new looking office wing (not pictured) suggests it only closed a decade or so ago.