Out of curiosity would anyone be willing to share any experience with non-paying renters who've vacated the property prematurely?

(We had already given them a reduction on the sale price under market.) 

You’re paying $70k in “non-deductible” interest in exchange for less deductible interest. 

Private equity firms seem to favor larger operations with scalable systems, while smaller mom-and-pop firms are often acquired by local players or regional operators looking to expand their footprint.If you’re looking for actionable intel, reaching out to brokers specializing in the sale of PM firms could provide useful leads.

Utilities included.Fully rented.For sale off market.

So now we cover utilities for both units and the new tenant pays a higher amount too on the back unit to cover all the utilities with a great profit.  

If you don’t owe then, everything is profit without paying overhead depending on the structure of your lease.

We're trying to decide whether or not to pay it off or save to buy another property. 

Quote from @Caleb Brown: Is the property worth the higher price to pay off the loans?

So for her, the fees of 3% at closing and 1.5% per year is a steal vs paying $400,000.