Paying off loans always sets off alarm bells in my head. :)
My first question would be what is your ROI on each of these properties? I'm guessing that they are considerably higher than the interest rates on the loans. Arbitraging high ROI vs low capital rates is a fundamental concept in real estate investing. Paying off loans always works counter to this concept as it decreases ROI. (Because you are increasing your investment size.)
Another concept is that of Return-On-Equity (ROE). ROE is like ROI except that we divide by equity in the property versus initial investment. As you pay down mortgages, the ROE will also decline because you are increasing equity. When the ROE becomes less than your ROI on some other investment, then its time to get the equity out of the property and into that other investment. Put another way, you have equity that is not working efficiently for you. Paying off early just accelerates this process.
Finally, there is opportunity cost. Assuming you have the cash to pay down some of these loans: If you pay down these loans you will no longer have the cash. Now, further assume the economy downturns and buying opportunities start making themselves available. You won't have cash, and the loan company won't give you that money back when you most want/need it. I would not advocate holding on to massive amounts of cash waiting for a down turn. But I'm guessing you can find plenty of short-term investments that pay higher rates than the mortgages you would pay off. (Hard money lending comes to mind.) Heck, at the rates you list, you can likely find dividend funds that have higher returns.
Of course, life isn't always about maximizing ROI. Peace of mind, risk tolerance, etc are factors too. Only you can make these (non-mathy) decisions. But hopefully I've given you a thing or two to think about?