Try to get that list specific.

is this a good way to buy a property at a discounted price? 

My partner and I have decided to move abroad.

But feel free to keep making more for PHX because I'm not biased or anything haha. 

It was next door to my moms bed and breakfast so we could manage it easily.

Is it a firm 6 months or is it likely to be extended.

It probably makes more sense to invest it than to pay off the mortgage but I can definitely see why someone would want to get rid of their debt. 

I’m running out of capital to buy more.

Right now, you are thinking of yourself and how to get you ahead and not stepping back and looking holistically at the process.

There really isn't enough information here for someone to give you a proper answer.What you need to do is calculate those tax savings over the next 5-7 years (or however long you plan to stay in the house) vs. what the interest rate reduction will save you over that time period.