or you said my hypothesis is wrong, it has to be depreciate 27.5 years and no other choice. 

Start by reading the Ultimate Real Estate Investing Guide: https://www.biggerpockets.com/guides/ultimate-real-estate-investing-guide/introduction2.

Start by reading the Ultimate Real Estate Investing Guide: https://www.biggerpockets.com/guides/ultimate-real-estate-investing-guide/introduction2.

Our choice was to repaint and put in new carpet to replace the new carpet they damaged. 

Start by reading the Ultimate Real Estate Investing Guide: https://www.biggerpockets.com/guides/ultimate-real-estate-investing-guide/introduction2.

On the other hand, if you can get a higher return on your investment property than the 7% you have on the mortgage or the mortgage interest rate on the investment property, then your money will be working harder for you in the investment property than paying off your primary residence.The choice is personal and unique to you.

Start by reading the Ultimate Real Estate Investing Guide: https://www.biggerpockets.com/guides/ultimate-real-estate-investing-guide/introduction2.

And I have been a PML business owner for a decade so it was an easy choice/chance for us to take and had access to funds to pay it off when rates jumped and our interest earnings was negligence compared to the risk. 

Ultimately if you have a solid team in place that helps you navigate issues that arise you will be successful. 

It ultimately is the difference in where the funding source comes from.