The bigger problem was mentioned in a report is a little "belly" in a hub or "void" , and eventually it will collapse pipe. 

The advent of currency, collapse of currency, hyper-inflation, deflation.

Managed to make a small profit despite market collapse.

I’ve bought knob and Asbestos siding and foundation collapsing and mold and beg bugs etc. don’t run from problems as they all mean money because most people think think like this post is written.

The investigative report by Reuters also found that servicemembers and their families stated the following complaints: "lead paint, vermin infestations, fecal and urine trails, bursting pipes, flooding, mold growth, collapsed ceilings, electric and fire hazards, and other substandard living conditions as a result of inadequate maintenance by housing companies."

The metal shops roof might have collapsed over winter, or there is just a ton of junk inside.

Refinanced during the beginning of the crisis before comps collapsed.

As I read it is very apparent that your over leveraging, and that means is 1 minor thing goes wrong the entire house of cards collapses and you will loose everything. 

Economic Update(Monday, October 5, 2020) The economic collapse sparked by the pandemic is triggering the most unequal recession in modern U.S. history, delivering only a mild setback for those at (or near) the top and a depression-like catastrophe for those at the bottom of the economic scale, according to a Washington Post analysis.

The other tenant's rent pays for the entire mortgage of the property plus about $20, so even if Airbnb collapses for some reason, the mortgage will be paid.