Remember, C/D located properties generally appraise once improved for significantly more than they will actually sell in an arms length transaction so you can go to many C/D neighborhoods, successfully complete the BRRRR method but deal with  all of the operational difficulties of the asset class and then fail to achieve a sale figure remotely close to the favorable appraisal  that allowed for the proceeds to be returned through the refinance. 

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

You failed to perform proper due diligence before closing on the rent house.

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

However, what he offers is available for $15 on the internet, and the other $39,985 that is paying for “mentorship” gets you 2 hours a week with an “advisor” who has never personally done a deal and whose main qualification was that he failed as a salesperson selling the gurus mentorships. 

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

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."

I'd speculate that your CPA failed to check the "complete disposition of activity" checkbox in his tax software, keeping these losses locked instead of releasing them.2.