@Torey Chumbley OMG! at 2.3% it's practically free money. DO NOT PAY IT OFF! Of course not all debt is created equal. But in this case it's a no-brainer. To become more comfortable do some research on "Inflation induced debt destruction" whereby debt is constantly being debased by inflation.
Also, sounds like you've put a good dent in your mortgage and have solid LTV. If so you're far less likely to default and lose your home so that shouldn't be much of a concern... worst case you can refi (even at a higher interest rate) and reduce your payments. But if you invest wisely your cash flow should help cover much of that mortgage payment ... and quality cash flow (on C class/ workforce apartments) doesn't evaporate during a melt down. People don't just stop paying rent to the degree that a 50, 100, or 200 unit property won't cash flow (if purchased and financed right.
@Jay Hinrichs Regarding "08 meltdown took no prisoners all asset class's had their troubles" ... This may be true but MF had far less trouble. Freddie Mac reported MF mortgage delinquency was less than .5% nationwide while single family was about 4% nationwide. Even so, I am currently taking a cautious approach and only investing in C class projects with value-add opportunities to force appreciation. Also choosing to put 10 year debt on our commercial purchases to give us a higher probability of riding out the next downturn.
To All, Fantastic debate here. By no means do I believe my way is the best way since everyone has a unique situation (income, expenses, risk tolerance, lift stage, etc). I enjoy the different perspectives as even my own thoughts on this continue to evolve.