Real Estate TAX Deduction

[Henry Li]

With the new tax law, our primary residence mortgage interest doesn't have tax advantage anymore to my understanding. I however own other investment properties , and there is one that is actually paid off. Would it make sense to get a loan from the paid off rental property to pay off my primary residence? 

This way, the rental property would have a mortgage, but the interest would be tax deductible because it is a rental. Does it make sense? or there is something that I'm not seeing it right?