Okay. Somewhere in a closet or a bathroom or a storeroom, there will be a lot of tiny telephone wires on the wall that all connect to a big box that says NEC.
If you can find and describe that box, it would help. A large box about 3' cubed, in the middle of the floor? A small blue box on the wall, about 2'x2'x1', white with a blue vertical stripe? Same, Navy blue, no stripe? Same, navy blue, w/ royal blue diagonal stripe?
Also, If there is a PC on the floor next to that box, does it say something like "AD-40" or "Repartee" or "Replay" on a sticker on the front?
