I don't feel right demanding they pay when I contributed to them missing a second month by not raising the red flag by noticing I hadn't received that month's rent.

What are the red flags? 

Red, yellow, anything but blue turn it around and go away.... 

The Red River Gorge (Natural Bridge State Park) area is fantastic.

That looks like a big red flag to me.

The pictures look nice, and a drive-by didn't trigger any immediate red flags, but I am budgeting for the worst just to be safe.   2) How would I go about making sure the title is clean?

I have been researching the Huntsville market for some time now, and one day I realized that there were a lot of rental listings on Zillow that had been sitting for more than 100 days, which is a red flag to me.

That's sort of funny, sort of a red flag for me. 

The difference in price between two reps at the same company should already raise red flags for you. 

If the City discovers the illegal dwellings they will most definitely Red-Flag them.