As someone that lives in a condo... oh the joy of training them to ride the elevator.
We actually got one of those little play pen type attachments that made the crate larger. This kept the crate for sleeping, the pads for bath room. Eventually he learned to just go in that one spot (all the while we kept taking him outside as well and encouraging regular bathroom visits). Eventually the paper spot in the condo disappeared and he learned that the bathroom was outside only.