Photo 1 by unknown (1939 - cont. by Terry Shreffler).
Photo 2 Bing Map's bird's eye view.
photo 3 Google street view (Sept. 2011).
Other Information
Photo 2 (Bing Map's bird's eye view) is a view of the original building before it was demolished to make way for new construction. As is noted in the view the Mail Pouch sign had been painted over.
Photo 3 is a Google street view (Sept. 2011) showing the new construction at the old building site.
Where to find it
*GONE* Northwest corner of the E. Long St. & N 21st St. intersection, in Columbus. The MP sign faced east.