OK, so this is a 60's house here in FL. The way the plan is drawn is the way it is actually built today. They either knocked out the block for the frame-wall addition, or there was a massive slider, or whatever, but the frame wall with opening is correct. The current owner has the reversed prints and it shows a SGD. It is interesting because there is a second story along that wall line. The owner is a structural engineer so he is investigating the setup. We can only assume they built a girder truss setup in.
After I sent it in, I did extend the block wall and put a door opening in there but it had no effect. @glennw I will try your suggestions.
PMMully's post in Mysterious room divider, can not get rid of it... was marked as the answer