Dustin there is a program called "Housing Alerts" by Ken Wade,  its an amazing tool. 

If he steps foot on the property I would call the cops and have him removed.

You are calling it a non-preforming asset which would make me think they are not paying.

It was borderline, and the wrong call was initially made to clean and keep the previous carpet instead of replacing.After a few months of WTF is this still vacant? 

When someone does move out, I deal with it, calling only local contractors from the BBB in the my area.  

@Paul Callaway your first step would be to call the city zoning department and ask them.

However, with the normal wear and tear/ usage of the two main entry doors to the units foyer area, we have had more than 5 service calls on the locks (for batteries, lock mechanism not functioning, etc.) and both front door Locks have had to be replaced once already and I am thinking it is time to use a different Door Lock method. 

Sometimes you need to hear it from someone else.I have a call scheduled with the multifamily PM next week to see what options I have.I’ve been aggressively stashing much of our income away in tax deferred accounts, and in equity investments in the meantime.

I don't have any specific experience with DHA, but I'd call them and find the right person to ask about this.

Call around it should be higher.