For mortgage debt, the following additional requirements must be met:the party making the payments is obligated on the mortgage debt,there are no delinquencies in the most recent 12 months, andthe borrower is not using rental income from the applicable property to qualify.

The cons - very hard to cash flow off the bat, especially with a low down payment and...

Once you do, begin the termination for non-payment process that your lease (hopefully) spells out.   

., if the housemate who’s leaving was covering 75% of your mortgage payment, that could be a major problem…but if they were only covering a small portion of the mortgage and/or they’re easily replaceable, it might not be much of an issue).Moderately important: anticipate and manage your relationship with the housemate tenants.

But multiple credit cars, car payment, rent is a no go.I've had a few tenants that went thru foreclosure when the market crashed, and want to rebuild.

I want to secure the now vacant property. 

So a big monthly payment you're thinking?

If the properties are for sale, they have a price.Regarding buying rental with S8 tenants in place, you need to verify the following so you don't get scammed:1) Rent amount2) S8 / Tenant split of rent payments3) What utilities tenant is responsible per HAP contract4) Any security deposit (which is for damages, NOT unpaid rent).

Another option is to get an interest only loan, which reduces the payment amount and thus allows for more cashflow.

If they truly had your best interests at heart, they would defer the payments until you made a profit.