Thanks guys. Verizon is telling the client that the lines are no longer in use. I am just the plan B.

Out of curiosity, what are the potential issues with this? I've spliced some of intercom lines for another building before; as long as my connections are good what can go wrong(I know; I shouldn't be saying this in our field). I did it wire by wire to make sure I don't accidentally switch pairs. The biggest issue was cutting the steel conduit coming up from the floor without melting the wires . Wet rag wrapped around the pipe and notching with the grinder without cutting through; a few bangs with the hammer and I was in business. Pull each pair out of the conduit before splicing with the extension of course.