There was another building in the City, the doors were locked, rubbish in the entrance, windows had 1cm of grime and it looked unoccupied.
To get in, you went into the adjacent building, up to the 5th floor, found the sandwich/coffee machine and went through the door of a cleaners cupboard tucked away to one side. Then you could go down to the 4th, 3rd, 2nd, 1st and basement - Ground was unoccupied to keep the outward appearance.
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taurus excreta cerebrum vincit