You have just described my reality Chris
Add to that Alsation dogs locked in bedrooms for weeks on end claw marks nearly scraping all the way through 25mm floorboards, those rooms grew smelly damp patches every spring and autumn in patches always centred on the T&G joints where the urine had run and collected.
Then there was the tons of decaying turds on the flat rooves and those of adjoining buildings where the imprisoned dogs climbed out the windows to do their mess.
And finally the buiding nearly collapsing from all the mortar being washed out of the bricks up to 1.5m high on the mur pignn where it had been used as a pissoir for 90 years, the plaster on the inside, the main bar dining room of the hôtel resembled that of the OP's toilet meaning that the urine had travelled through 35cms.
And to ad insult to injury despite the hotel being closed for 3 decades when I moved in people would still use the wall as a pissoir even stopping their cars and getting out en masse to do so, I had many a ruck and it continued for several years.