Are they fool proof - no, nothing is. 

Land trust has limited lawsuit protection, I realize it is never foolproof.

Now, this is not a fool-proof plan; although, I know people in this business for 30 years and have done it the same way I have and have yet to see a claim.

Rents stagnate and do not keep up with inflation, utility companies if landlord pays water etc. can raise water and sewer rates even with no leaks and eat into returns.Again I do not want people thinking multifamily is fool proof and can't lose proposition. 

You're looking for a simple formula that doesn't require a lot of work and is foolproof. 

I am sure it will need tweaking or adjusting as no "plan" is ever fool-proof.

And even that isn't fool proof but hiring someone who has no references is just too risky these days.

Entering the house-flipping business requires having a careful decision and foolproof planning.

This method is a good formula to quickly vet a deal, but not foolproof. 

Because these deals are fool-proof!