Are you aware that on some deals some lenders may require certain net worth requirements of you, and certain amounts of cash equivalents to belong to you to qualify as a borrower? 

In that case you'd be wanting to beg borrow and steal every penny you could to purchase real estate. 

Assume the borrower defaults, then what? 

Also, there are tax benefits that you cannot get with most investments, you can borrow 80% of value, while it still earns a return.

The money is borrowed at 0% APR for 1 year 2.  

Borrowers ability to pay and afford this home since they had zero down2.

Borrowing from my primary so I can buy another rental, which is also borrowed money, is a fools’ errand…creating an “alligator” right at purchase and putting my own house at risk. 

Actually it looks like it is by each individual housing authority if they will participate.Hate to say this, but it is going to be like finding a needle in a haystack.....borrower will need to find a lender that will do it. 

Borrowers need skin in the game.

I'm borrowing at the rate of ~7% and 7% is a great return to me, especially with the stock market near all time highs.