China has a lot of air pollution, and that could be contributing to the high death rate, as the virus greatly affects the lungs.

How has the rehab been affected by the lock-down situation?

I'd prefer to do a HELOC for something like that, though, because the rates are better and typically access to funds is easier and more straightforward, and usually the HELOC is interest only for several years, allowing you to truly rinse and repeat.

Will that affect my ability to sell it in two years and claimed it was my primary residence?

If you are 30 years old, hit your FI number, and handed in your 2-weeks notice to your employer to start out 2020 then your portfolio will have a more significant drawdown affect as a result of having a "down market' in the initial withdrawal period.For a more robust discussion on this I would recommend  digging into the Sequence of Returns Risk discussions with JL Collins (the FI guy, not the Built To Last guy) and Big ERN from Early Retirement Now

Perhaps there are some rules/regulations on the horizon that will affect the STR market? 

For the most part, they did not ask one or more of those questions which directly affected the rate and where those loans were going.Rates are close to the same from lender to lender, especially for conventional financing, depending on the schedule they set up with the eventual servicer. 

Repeated calls on multiple properties and never once can we get a call back.

How much do you expect this to affect the rental/housing market in SE Colorado Springs?

What you don't want to do is fall into a pattern of repeating the same curse word over and over and over again in the same, dull, monotonous, helpless tone. if you're reading this and laughing because you know exactly what I'm talking about...What's the worst that could happen?