If you’re trying to self manage a condo in a city you’ll likely be dealing with the police and angry neighbors.

If you represent buyers for that project and get commissions as a realtor (and on top of it don't disclose it), it's promotion for all intents and purposes and against the rules so I was just warning you against that in a friendly manner (I'm not here to play the police and people can see through direct or hidden promotions it's not my role to judge for others). 

These arguments happened several times to the point where we almost considered calling the police as there was clearly violence involved.

He’s an alcoholic and does not work.The police do nothing and show up hours after the call.

We have Clemson graduation booked for this year at $600/night.No issues with the STR police here.

In conducting a background check, I learn the applicant's current neighbors hate him, he's on a first name basis with the local police or he has a variety of other social/criminal issues chasing him.4.

Have the police been called?

Fast forward 21 days and the police bust the apartment door in and arrest him for drug trafficking and possession of a stolen firearm as a felon (according to the newspaper).

It sounds like you had trespassers and should have called the police.

Let the police handle this.