>>318754The one on your picture isn't a mansion, it's a place for hosting events with a hundred of VIP guests.
>So what if you managed to get into one of these and just squat.The squat friendly laws only work against the people who are not in the big club you ain't part of. If you ever broke into the mansion of somebody important, the cops would come one minute later, beat you almost to death, throw you in a cell and harass you to get a confession and then the judge send you behind bars for years.