There is really no IRS private letter ruling specific to DST (or at least it is never mentioned as such) as far as I can tell, despite some advertising to the contrary.

As already mentioned it definitely depends the specific scenario! 

I don't know where to look to find the answer to this specific situation: I have partners with an inherited home.

Specifically:- Are there any exceptions or tax treaties that could eliminate or reduce my US tax burden on foreign rental income that is otherwise taxed locally?

The 1 and ONLY exclusion to this fundamental fact of reality is in very specific, very SHORT-term and very rare instances which are for example last year where for some month's taking a break in bond's was, via the "witches brew" of factor's, the better play.

Registre Foncier du Québec This will tell you about anything that has happened to a property Sale, Transmission, Lean, 60 day notice, Expropriation, sub dividing land....Very had to find specific deals in here, you’d need to be lucky to find a 60 day notice, you have to search every address and fall upon it2.

As a buyer, there is no reason to not work with a buyers agent if you have a buy box and are looking for a specific criteria.

In order to do this you need to know what's going on in the area of your rentals, consider your exclusive contractor relationships, and get someone to run a viable cost estimation on your property (specifically an "insurance" cost estimation). 

Feel free to ask any specific questions.

At this point I am thinking to ask my lawyer to threaten with the specific performance lawsuit if she doesn't want to close in the first week of March.