I did explore it, but there is not much to do without police reports. I had only reports for theft but those were not investigated, could not get noise reports as the cops would not come or come during daytime when the homeless went off the camp.
I had been reporting the property to code every week - it's indeed against the law to allow people to live in a commercial property. The code officer they've sent was unable to find people living on the property each time, she said that the people hanging around the property are just guests of the of the owner and don't live there.