I've downloaded your pdf, and I'm looking at the opening between columns 50 and 70. It's so obviously a doorway that I can't fathom how anyone could possibly mistake it for anything else. It's got sharply defined vertical sides, and a sharply defined horizontal top. What exactly is your reason for believing that there was no such doorway?
Dave
Dave,
I am attaching a floor layout. The vertical line of columns passing through the tip of the big arrow consists of those beginning with the number "7". If you go to the top of the layout, the top of the NAVY area is the exterior wall of interest. As you can see, there is no opening between the "7" column and the "5" column, to its left. The room layout adjoining that area also suggests it would make no sense to have a large roll-up door there, in that the room only has a regular door opening into the hall.
Dwain