Is loitering with the intent to sell drugs or solicit prostitution  illegal?

Crime, drugs, prostitution, blight, property damage etc.....The fact that it makes you uncomfortable to talk honestly about the facts says more about you than the person using the terms.

We now found ourselves renovating 8 very bad units (with time we didn't have and we hadn't counted on borrowing/spending), chasing off prostitutes, watching people literally fight each other for the scraps of copper pipe we were tossing into the bin, and waking up at 1am each night to chase away people showing up to buy drugs as soon as they got out of the local penitentiary... 

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.

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

Well, unless pimping and prostitution is a federally protected class I'd skip these applicants!

I even found out one of the squatters was a BackPage prostitute (one that had two children) with random men and groups of men coming in and out of the apartment.

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

This was confirmed when I took an uber pool through Trinidad last year, I saw what looked to be prostitutes on the street corner and when two young blond girls got in my shared uber I asked them how the neighborhood was improving and they told me they were just coming from their friend's place in Trinidad and that friend had just moved to Trinidad a week before and that she was robbed the night before.

His father whereabouts are unknown and his mother is in jail for prostitution, and unluckily his well meaning grandmother lives in the neighborhood, he is in her care.