A history of past sales can indicate their effectiveness in the field.

It depends on your local laws, but any paperwork you can provide the tenant to indicate that they need to respond might help.

My research online indicates $2-$2.50/sq. foot for installation of flooring.

Actually nationwide in the last one year inventory is rising albeit it doesn't indicate the drop of the price so far.

What the charts you provided don't indicate is whether they represent individuals who have name on deed.

I would not say that this short-term moment is necessarily indicative of the prospect of the overall market over a 5-10+ year horizon. 

CoC is more of a year 1 indicator and these aren't 1-year term investments.In future positions, someone scaling to 4-6 Class B+ or better properties over 10-12 years, and selling/re-fi'ing 1 to 2 out after 12-15 years is really the route.

A tenant complaining online might indicate that the property manager handled them appropriately, so be sure to ask the manager for their side of the story.7.

I'm also learning that yield is another important indicator of a property's profitability.

She improved the houses and now indicates that she wants to sell them off, as the idea was more promising than the investment.