I do not remember the letter of the hall in the ol...

I do not remember the letter of the hall in the old wing, in which I walked along the indexes to the 3rd or 4th floor of the new wing of the center, but I rested against a blank wall of perforated metal. It turned out that the old and the new are connected only on the first floor. Outside. But I did not understand why you can not correct all these pointers?