Ken (see Corey Sciuto: Ken Coffin) sent me some more photos, these are all of the fire at what is now the Market Mills. If anybody can get me a date range for when this fire happened, there might be a trip to the microfilm archive at the library in my future to find out more about what happened. It must've been the late 70s, because they were repaired in the early 80s, and I have a photo (http://repository.digitalcommonwealth.org/handle/10240/387) that was supposedly taken in 1979, and shows the burnt-out building.
Update: I found a date: Feb 7, 1979.
Example new photo:
Ken's email again is firstname.lastname@example.org.