Welcome to the forums! The 12' opening will need to be framed up and finished to 82 with a header across the opening, covered in sheetrock and prepared for painting. Then your french doors could be installed, cordoning off the area for the office. Be aware, however, this modification may not be desirable to new buyers, since you mention selling soon.
If the door is aluminum, I would assume that there is leakage occurring around the siding, and you still have not mentioned what type of siding you have. (if you get water behind the siding it would get behind the nailing flange of the door and it's likely that the insulation around the door would be wet, which you can examine if you remove the interior trim as mentioned above.) It could also be that the bottom of the rough opening was not properly sealed when the door was originally installed. (This is hard to tell without removing the door). There is a remote possibility that dirt and debris has clogged the screen track and weep holes on the exterior of the door, which may have forced water to run backwards into the house. It's also a possibility that someone caulked the outer threshold of the door which acted like a dam and held water or caused it to back up. If its clear that the door install was botched then you might have a case... or at least you could have some leverage to split the cost 50/50 with them. Another possibility is the level of the surface outside the door. If you have a sidewalk, concrete pad, or deck that is HIGHER than the subfloor, standing water or snow could cause water to run back toward the house.
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