Required receptacle at storage room?

[RobShepp]

Jerry,
This one is a little tricky, I have a third floor room that is roughly 7' x 7' with a hallway leading to the room(about 10' long hallway) that has a interior door at the end of the hallway. On the blueprints it is listed as "Storage" but has an exterior door to the third floor balcony area and a fixed window. The room is big enough to use as an office and most of the owners are using it this way. So, we have one continuous wall along one side that's roughly 12-14' long, then the exterior balcony door. There is not receptacle in this room, the owners are running an extension cord from the exterior of the hallway door into the room for electric. I'm hoping the photos help. Thank you Jerry...

[Jerry Peck - Codeman]