Contractors all the time either fail to finish or finish in a way that prohibits you in selling and exiting or refinancing at the number you expected and now you have to leave way more in than you thought. 

@Pat Aboukhaled wife & I have thought this would be a great use of failing malls for affordable housing.Unfortunately, as @Greg Scott points out, many people take the path of least resistance, which can ruin the idea.So, you'd want security cameras and maybe even security guards to hold residents accountable. 

If you fail to follow the rules, you may open your personal assets to a lawsuit.

If the proper reports and documentation are not completed, you run the risk of failing an IRS audit and the cost segregation not being honored.

This is why a lot of the crowd funders failed as well.. not only picking poor projects but they had hordes of small investors throwing  money at them..

The good news is that the financial metrics you've read about are universal and not at all country specific.The bad news is that Germany may just not be a good cash-flow market, compared to the U.S.But then, few markets are.That's why you find so many Germans and Australians and Spaniards and others trying so hard to find great deals in the U.S.And, even in the States, there are plenty of sub-markets where properties routinely fail the so-called "1% rule."

If you fail to follow the rules, you may open your personal assets to a lawsuit.

As long as USA keeps running around high on smell of our own farts of greatness long-gone, we WILL continue to fail, and fail HARD. 

They don’t make loans hoping the borrower will fail.  

I’m so sorry to hear about your loved one’s failing health.