If it still produces good positive cash flow with a hypothetical 100% financing it is worth keeping and pulling out your equity otherwise you are artificially supporting a lame duck with your own cash. 

It's better cash flow, and an artificially super low rate right now. 

The mortgage interest deduction is an artificial prop to real estate prices.

I provided a furnished room and amenities geared to that group and advertised on the bulletin board at the University of Washington School of Medicine.

You could count it as ROI however since you have no idea what the property will eventually sell for you may be artificially inflating your numbers.

I think that they did this to keep the rent artificially low.

Did you get a degree in Medicine?

Think of it as preventative medicine.

Paying down a rental property loan reduces actual income through the purchase of artificial income. 

Mix in medical conditions that require medicines like blood thinners (My grandfather had the heat set to 80 when he was on them) and your even more screwed I think.I know on my Nest T-Stats at home, I can set a schedule based on the hour.