The masses would have no nice places to live and all would be fine in your make believe world.Gary

Mass amounts of these drugs are already in use in New York and are headed to other areas for use as well. 

Most and i would say 99% of true HELOC's give the lender the unilateral authority to stop any further advances on the line and to call it.. would be rare they actually froze it and foreclosed.. but freezing it sure this happened en Mass during the GFC.. and the main issue is you dont know it until you try to access it.. the letter saying its frozen shows up about 30 days later  :( 

China is currently experiencing mass layoffs even though its economy is open for business.

I think the best place to identify this very specific group of owners / landlords would be to reach out to them directly on Airbnb or through the COSSTRA Facebook Group that is comprised of many STR investors.My wife and I have definitely felt some pain with mass cancellations and demand plummeting in the last couple weeks across all of our short term rentals.

If we have a protracted downturn and a commercial loans start defaulting en masse will that spill over into residential real estate?

First thing I would do is contact your lender and get answers from them on how they prepare to deal with property owners with tenants who are defaulting in mass scale because of the Coronavirus.As you may know, the AZ Governor signed an executive order delaying evictions for tenants affected by the Coronavirus.

With that said, he is great for the masses and yea, I took the course.

There are programs at local, state, and federal level that can all be leveraged during times like these.Actions and InfoContact Government OfficialsAll government contact info: https://www.usa.gov/elected-officialsCall AND email the Presidents Office: https://www.whitehouse.gov/contact/Call AND email Mass US Senators: https://www.senate.gov/general/contact_information/senators_cfm.cfm?

I do not know if Auction.com is still owned by many of the major banks, but it used to be and that was how they cleaned out their REO properties en mass!