The brick Dennison plant shown in the 1895 map was there until at least 1931. Regarding the Hine photos: by that time, Dennison still owned the property, but it was a furniture factury. It may have been leased out to another company. And Hine using this as an example of child labor was pretty silly. The kids were probably tying string on to paper labels - not exactly brutal work. And his caption ‘Working in the hot sun’ shows just how hard he was working on the propaganda angle. If they were playing in the same hot sun, would it be an issue? Hine did some good work, but this wasn’t part of it.
By the way - Tumblr wasn’t the best choice. This is a painful way to have to make comments. Google or Wordpress blogs would have been better.