If you're determined to use concrete, ensure either you or your installer is using fiber reinforcing or wire mesh reinforcing.

This is not normal unless they have pending bills they need to ensure get paid. 

I learned to put a memorandum on the home at the sheriffs office as a "lien" to further secure my deal.Doing my research and communication with everyone from the court, bank, attorneys, etc.on a constant basis ensured that nothing was delayed or missed.I learned about abatements and how to get to the next level when I had a uncooperative code enforcement office.

You also want to ensure your assets are protected and you are set up correctly with the proper legal structures.  

We had a heart to heart literally just this afternoon because I'm one who can go full speed ahead and multitask and do a million things at once but I felt he wasn't moving as quickly as he should so we just had to bring our thoughts to the forefront and ensure we were still aligned. 

Once you have a good rep & portfolio of properties it will be easier to A-attract investors, B-ensure trust and earn full operating trust.

That’s why the IRR doesn’t always measure the return on the initial investment.When looking at a “good return” you simply want to ensure that your return reflects a sufficient amount based on the risk of your investment.

That's probably your best, most cost efficient option.

It is not the most efficient but more times than not, you end up getting in contact with the intended party. 

There are many turn-key providers who can provide you with great cash flow but you need to do your due diligence to ensure they can deliver.