Honestly, I have NO IDEA how they are getting away with it. If it is that bad that mice and rats are running around, I am really surprised that LoFi is putting up with it. But, what you describe is precisely why people are often not cool with chickens and other farm livestock kept within city limits or in close proximity to where they live. And, by the way, I say that as someone who 100% would love to keep some animals. Growing up, my paternal grandpa ran a small farm and so I got to spend a lot of time around chickens, rabbits, and pigs. Those are some fond memories, but I totally get why people would be opposed to chickens living close by.