Now that just threw my out of my chair, because I'm from Germany and over here that is an absolutely impossible return.

I agree, it's very difficult (impossible really) to type any response to the forums or messages.

The only thing I can say for certain without knowing your exact situation, is that it's possible.As @Brian Eastman said, it's nearly impossible to answer your question without knowing the who/what/where/when/why and how.On top of what everyone else has said above (all great suggestions), I would say that the best piece(s) of advice would be to talk to your CPA/tax strategist, find a custodian that fits your goals and needs, and do your due diligence in vetting prospective syndicators - they'll likely be able to give you an idea of how SDIRA investments in their properties have gone thus far.

There may be a level of arrogance but it truly is near impossible to find as powerful a tool as they have provided.

They are tougher but not impossible. 

Flipping houses was pretty near impossible, but buy and hold with cash had tremendous cash flow.

Getting your deposit back will be next to impossible.

Realistically though that is nearly impossible 

Carrying bad debt will make the lows impossible to survive.

The best strategy I think in Houston and what I've seen are rentals because flips are a little tight right now but not impossible there still out there, you just have to work a little harder to get them.