Can you find on your mounds of paperwork the date the building opens? The first page of your purchase agreement.
I have 6A with an opening date of June 7 which is in building two. Somewhere in the paper work you can see the layout of each floor of building one and each floor has about 6 sections with letters and numbers and I think thats how they deed your interest (share of the building) A while back people where talking about this and realized it doesn't make sense to us but somehow Disney understands it.
The info you really need to know is when your building opens.
I hope this helps.
Lori