Hello @Roberto Rohann,Some lenders do not run municipal searches so some of issues mentioned wouldn't affect your ability to obtain a loan for the property. 

It is illegal to discriminate against a tenant based on their source of income so I would advise against even mentioning this in any way shape or form.Are you qualified to purchase expensive RE?

If they didn't respond kindly to sincere attempts to fix the problem, I'd mention your attempts.

It does have a new roof.Zillo shows it at $474 K and they mentioned asking $420. 

Every asset you mention, you have a side reason why it won't work.

@Sanjeev Advani While this may be a good talking point what no one is mentioning is that with most of the federal land areas there is NOTHING there to draw people to want to live there.

A lot of people mentioned Facebook groups, and that may be the best source for what you are looking for.

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

@Ndy Onyidoreplying your strategy on #3, I will add the following for you to consider.Most of these properties as @Rick Baggenstoss had mentioned are run down , townhomes, land lots.There may be additional liens on top of the tax lien, such as HOA lien. also with the townhome communities, some of them has rental % restriction; meaning the HOA only allows so much % used for rental. the rest has to be owner occupied.