Defecation in corridor
Yes a pile of defecation in the corridor - and the cats downstairs were trapped. Guess who had a pet cat that was allowed to wander though? The people on the floor directly above - and the unit directly in front of this corridor. The woman on the floor above told me her cat had recently stopped using her toilet floor and had started running out to defecate.
The good news is that she did seem very fond of her cat. She also asked me how to grill the door and where she could buy it. So I'm crossing my fingers she will keep the cats in. At the same time, I let the town council know that these aren't community cats! So trapping the cats downstairs again has no effect.