You don't necessarily need 20% down and since it's below market, might have room for a healthy seller concession..check with the lender for disclosing the seller relation. 

Probably not, but I wanted to create a linear path to compare selling vs. renting. 

I cannot speak for all banks/lenders but in most cases this is how it is processed.The main question would be how are you going to show your income to purchase the new primary home.

What your looking for is private information - unless owners/lenders want to volunteer it, you won't find it anywhere.

Before transferring a property to an LLC, check with your lender.

Does anyone know of US lenders who help Canadians get an American mortgage?  

If you have strong credit and a good relationship with your local bank, they might be able to offer you something suitable.For lenders offering DSCR loans that don’t use DTI, only cash-out refinance options are available.

These loans are amortized over 30 to 35 years, and it is advisable to approach DUS lenders directly to avoid additional broker fees.➡️ HUD loans have slightly better terms than agency loans but require a longer approval process of around 6 months.

I have no idea what that's supposed to mean but no legitimate lender would have a statement like that on their website.

Find a local lender, and set up an affiliate program.