I've heard a few stories of people running T1s through Bell's facilities, hush hush, just make the connection at the cross connect in the back of the office park and connect two offices together...

Closest I ever came to doing anything like this is I ran a T1 through the "house pairs" of an office building..from our office on the 8th floor to an office on the 1st..and I made sure to find out that the house pairs were owned by the landlord (who wouldn't care), not Bell. I'm sure Bell installed them but after divestiture they became the landlord's property.