She said that if I pay $42,000 for the next 18 months, that she guarantees I will at least get this 42,000 back by the end of 18 months but probably much more. 

Even if you break even, you will lose money every month it sits vacant, when you need repairs, property management, etc.

I've been trying to have one tenant do the autopayment for 8 months now and it has only worked one time.

Owners mistakenly ASSUME all PMCs offer the exact SAME SERVICES and PERFORM those services EXACTLY THE SAME WAY, so price is the only differentiator – so, they often select the first PMC they call or that calls them back!

Zoning, buildouts, service contracts, advanced mechanical systems etc. none of which are encountered in residential.

My cousin is using one and likes it.Cell service is weak at our cabin PF so it would not work there.Might be good for a smaller house in an urban area with good cell service.

Perhaps we "buy" the house from them for the $328K balance to satisfy the lender and don't need a large down payment and then have a separate contract with them to pay $x per month until we've paid the full $172K amount.

Servicing costs are fixed, rates get higher lower the loan amount gets.

Depending on the volume you would be submitting, find a company that does not have high monthly minimums and can walk you through the process if this is your first time using.

@Stacie Telles Assuming you took out a conventional mortgage on the property you won't be able to refinance for at least 12 months.