One of the big things we use for qualifying tenants is their income.  

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"the borrower is not using rental income from the applicable property to qualify" - does borrower here refer to the seller applying for a new loan or the buyer of the subto deal?

Unlike the traditional 30-45 days that it takes to qualify and close a home through a bank, closing Sub 2 does not involve any banks or title companies.

You want to have an income qualification such 2 - 4 times the gross rent to qualify for the unit.

however - distressed properties aren't typically purchased with a conventional loan; they may not even qualify. 

I highly recommend a well-qualified REALTOR that works with investors and knows how to best help you.6.

I would grab anyone who will do it for you and I would expect you will pay 15 to 20% apr for those type of loans given the risk profile.. has nothing to do with you personally as a qualified borrower but for a PML if something went wrong and they are sitting behind 3 to 15k mil in senior debt most could not pay off the first to protect themselves. 

You have a duplex which means the 2 sides have different addresses.If I am not mistaken, an ADU would qualify as it doesn't have a separate address from the main house.

Down payment can be higher than primary, but the good thing is that you won't need that much income to qualify because lenders can you 75% of the market rents for the units of the property.