For a reputable builder, ask for recommendations from friends, check online reviews, and visit recently built properties in your area for ideas and potential contacts.

I think doing background/credit check yourself is of course the best way to try and vet potential renters 

A lender who would finance a mortgage application with a US citizen and a Canadian Citizen on the application.

There is some more paperwork and hand holding with the housing authority, but like anything else if you vet applicants well, and get comfortable with the additional paperwork it can be a great tool to have.  

What screening company address should be included for applicants whose screening reports were run through Zillow?

I would generally say if more than 10% of your potential investors are going to be asking about it, it should be in the offering memo.That being said, I have seen one page word documents used to raise over $10mm and I have seen 40 page, full color with professional photos, etc.  

It's definitely confusing when the potential cap rate after rent growth could drop the value so significantly. 

EDUCATE YOURSELF - yes, it will take time, but will lead to a selection that better meets your expectations & avoids potentially costly surprises!

The comps are between $118-$141/sqft, but it was purchased at $148/sqft.The loan is assumable at 2.75% rate ($139,383 principal remaining) but will cost $900 application fee and  between 1-5% of purchase price (assuming 2.5%).

Am I just out of luck due to the non-disclosure applicability?