@Jason C.,
You'll find BP treats this question like politics & religion; there's no right answer because it depends on factors very personal to you, which fuels the perpetual battle of risk vs return.
What value do you realize by paying it off? Are you trying to lower your risk or do you want to add a LOC on the property once it's paid off?
Given your $500/mo gain once the debt is cleared, your pre-tax Cash on Cash (CoC) return is $6k/80k = 7.5%, and subtract ~2% to approximate your after-tax CoC return. If you're comfortable with that, then do it and feel good about it.
On the other hand, if those numbers make you hesitate and if you're tolerating the risk, then look for other ways to invest your $80k (private lending, crowdfunding, traditional securities, etc). Or, do you have any other debts that you could clear that might generate a better CoC return? Student loans, car loans, primary residence, etc.?
Quick math check: I'm a little confused on your cashflow numbers. Once the debt is cleared, how will your cashflow equal the rent (both = $1195)? Do you have other income that's offsetting your operating expenses?