Not been, but yep, guardians living in there! or security. The only way I could see that happening was via a static van, big enough to actually live lolI'd struggle to believe anyone would officially live or work inside any of the buildings, either through a guardians scheme or security work.
Even the two office blocks on site, which are not in this report and would have possibly been the only spot safe enough for existing inside of, are in an equally trashed state.