In the episode Dead of Night of Torchwood: Miracle Day, when Jack, Rex and Gwen infiltrate the PhiCorp warehouse, Jack comments that it's "bigger on the inside". Assuming it just doesn't look bigger, but physically is bigger, this would be a common trait we see with a key piece of Time Lord Technology.
I know this technology has been possessed by someone else other than the Time Lords once: the Genesis Ark, which was built by the Time Lords but ended up in the hands of the Daleks. Was this warehouse also built using Time Lord technology? If so, where did PhiCorp or the Three Families get it? The only instance of this technology I can think of, other than the Time Lords, is the Genesis Ark itself, but this was sucked into the Void.