I have a friend who has a house in the city. One day he started getting horrible water stains along one wall in the entryway to the house. He checked all of his pipes, seams, etc, couldn't find the leak. He asked the consortium rep in the building next to him if they had a problem and they said no. About a week later the consortium in the building to the side noticed they had a problem and started telling my buddy he had to fix his problem and pay to have their property fixed. He could find nothing wrong, had plumbers come out who said at best it was a joint problem with drainage coming down from the roof in pipes, but they couldn't find anything on his side at all. The consortium in the building next door refused to do anything on their side.
About a month before, the consortium had made some changes to the face of the building and the awning over the kiosco that takes up half of the ground floor. Turned out the workers had drilled near some piping and had scored the pipes or something and it was the other building that was leaking.
It took about 4 months for the other building to do anything, after my buddy was taken to mediation in preparation for getting sued, and the mediation included them having to inspect their building.
They have yet to apologize for the attitude, much less pay for the damage my friend suffered. He just took care of it, not wanting to get into things with them and chalked the experience up to knowing more about his neighbors.
I'd probably believe just about anything you had to say on this, Fred

But if you get taken into some proceedings, you really ought to have a lawyer represent you.