One was taken over by some squatters causing problems for the neighbors and the police were contacted who contacted the lender.

I would tell the complaining neighbor to talk to the other neighbor directly and/or call the police.

Quote from @Theresa Harris: Tell the tenant to phone the police and file a noise complaint. 

Its typically triggered by a third party, so until someone wants to complain, there is no ADA compliance police wandering around giving citations.

My 2 cents: You're young, you could get a real estate or real estate adjacent 9-5 so you can get paid to to learn more about real estate while learning and building the side hustle outside of business hours.Seems like you live in a major US market so that's a plus, you could get a tenant services coordinator job in commercial real estate making $40-60k (not sure if that's more or less than what you are making now) It's an Entry level role, anyone with a degree and a polished resume and a passion for real estate should have a decent shot at landing a job like this.

And yes, they ARE actively policing it.

it is already the 6th day of the month, and most of our tenants made the on time rental payment on the 1st.we am copying our attorney soon and will report to the police department for lost $49,987.00 tenant rental income.So far we have called your customer services and online chat but nobody is answering.

.- Have they filed a police report?

This reminds me of a police officer  pulling somebody over without reasonable cause and asking to search their vehicle and if the person does not consent, they’re saying you must have something to hide.

You can even look for police reports in that neighborhood.