I live in a residential neighborhood in west Denver. There is no homeowners association here as it's an older neighborhood. My neighbors have been running an auto repair shop out of their garage (15 feet from my bedroom window) for going on 3 years now. It's full time, all day, on weekends, and they appear to have no shortage of customers. I've done my best to live and let live but this is a constant nuisance and I can't take it anymore. It needs to stop. They are slick with hiding their operation. They have a few cars pulled up on the morning to get worked on then they drive them somewhere else and bring another one in. That way there are only a few cars out there at any time and in order to catch them, you literally have to see when they are pulling in or out. Occasionally it even appears as though they have "employees". Weirdos that live there for a while and help them shuffle cars around. Multiple times weekly there are flatbeds in front of my house dropping off vehicles for repair. These guys have it down such that they are in and out within 5 minutes. The drivers must know them personally or something. I have called the police and they won't get involved in a situation like this. I called the city and they said that these people have been a case in their system for some time however unless I testify against them in court, their hands are tied because the city can't prove it. I would rather not go there and make myself a valdalilsm or break-in target. I thought about calling the dept of revenue but they have a business registered with the state that they likely file taxes under. Their business description is "general technical services". Any suggestions on how to shut this down? There is no doubt it's illegal but it seems that there is no one to enforce. I don't want to be malicious but I'm also tired of them breaking the law and no one cares.