It's especially dangerous when using a percentage of a low rent amount. 

I've used it myself.http://explosive-cash-flow.com/LOI.doc

1st question is if you are in a dangerous Radon Testing Area:http://images.nationalradondefense.com/509/radon-zones-epa-map.jpgIf you are in a dangerous area, sometimes the mortgage company will make it part of the "due diligence".  2nd question is, is $150 worth knowing that you are safe? 

That is legally very dangerous.

Another danger sign.I do know how much I know about residential construction, and it took me quite some time to get to where I needed to be.

Single member LLCs are dangerous from an asset protection perspective.

I've spoken to many local very experienced and saavy agents/PMs who caution against it due to to the amount of headache involved with low income areas and the crime, dangers and risk that come along with it.

Hand guns with children are seriously dangerous, but if they are legal, I don't complain.  

Tourist explosions? 

If that's the case, might be a bit dangerous to look at COVID numbers.