I am interested in accepting VASH vouchers for homeless veterans in Detroit and since it tends to have a high rate of single males especially  alot of drug/alcohol abuse in this market.

You don't need an EIN for the disregarded entity SMLLC unless you have employees and need the EIN to report payroll taxes.If you have already formed the LLC, what tax treatment option did you elect at the time? 

We did this one time when a tenant's father had to stay with him for more than a month while getting cancer treatment at a nearby hospital.

They require regular upkeep and oil treatment.

I was wondering what is the tax treatment for that.

Once you have researched this and have a application form,  lease, security deposit, crime free / drug free addendum, forms set plus the lead addendum,  and you have set your rental criteria is, like number of people permitted to live in unit, credit / income requirements, criminal, ect you can  then start advertising. 

Once you're able to see either certified property records or tax filings, you'll see either the real expenses for the property or the fluffed expenses LL has included to get better tax treatment.  

If not already treated, even some oil or deck treatment on the deck boards would maybe lessen the gap, plus it'll prolong the life of the deck.

So how well are those houses well cared for and what type of crime and drug issues are reoccurring?

Here is a link to a fogger I used in the past. https://www.chewy.com/virbac-knockout-area-treatment-spray/dp/53854?