They've experienced a couple of murders I think in STR and some prostitution problems. 

There were always prostitutes on the corner of my street when I lived in Hollywood, but ironically, no homeless people.

You're in business to make a reasonable profit without exposing yourself to liability.Ok I see your point but how many drug dealers live in your neighborhood or how many murders or people who break into other people houses and steal from them or prostitutes do you know of.

Prostituting? 

Drug trafficking, sex trafficking, prostitution, people hiding from the law, etc.  

There’s either drug dealing, prostitution or a combo of both going on.

There are four apartments on the upper floors.The neighborhood is 10 years into the early-artist phase and shows signs of other development activity happening, but is still has a lot of drug and prostitution activity.

I went to their office a few weeks ago and spoke to the lady that handles the fifas, because I have a house next to one of mine, that is full of prostitutes and drug dealers and it's still in the name of the deceased owner and her taxes are $ 30 per year or so.

He said "Americans are rich" and he "has nothing" and his "mom is a prostitute".

Is it illegal to not rent to Prostitutes especially if the tenant screening service shows demonstrable income on a consistent basis?