Here's an overview of my situation:-Neighbour of my mother-in-law is looking to sell privately, his children/family aren't interested in his house.

Encourage neighbours to phone the police if they feel threatened.  

Neither am I exactly (my credit utilization is high currently leveraged in my marketing company)The property owners live in Greece and the property is poorly managed due to distance I suppose.

@Aviv BerkovitchDo you know any of the neighbours? 

But post-Patriot Act, I have to go by the name printed on my Consulate Report of Birth Abroad certificate, which was taken from my Greek Orthodox baptismal certificate in 1976 and transliterated as the full, most formal, religious form of my name.I used to live and invest in Greece.Just try to get something like this done over the phone with an Arab name in Greece, something good and ethnic like "Imran ibn Tarik al-Shamoon."

Even if a tenant did opt to call and complain it would take a very long time to convince the annoying neighbour to move away.

You could also ask the tenants or a neighbour as they would have seen them taking off the old shingles. 

I'm sure others will have ideas, but talk to the neighbours and let them know to keep an eye out for any activity at the property.

On one of my earliest deals, when I asked the seller’s broker this question, they said, “They plan on taking the money and moving to Greece for retirement.”

It is inexpensive.If a neighbour is interested the likely hood is that they are not a seasoned investor and you can probably get a higher price than going to market to sell.