You can, and certainly the interest rate is bound to be much lower than a hard money loan.  Just remember that the more credit you take out on existing credit lines, like the ones you may have on several of your rental properties, the lower your credit score will go, as potential creditors don’t like to see you “maxing out” your open credit.  It is a sign of potential distress.  Most hard money lenders are private companies or individuals and do not report to the credit bureaus, so your credit scores are better protected. .