The colors correspond to an areas location grade (on an A to F scale), which is simply a score calculated by looking a eight different risk indicators and comparing them against the averages in the area.Areas that have improved one or two grades in a relatively short time will signify dramatic improvements and help predict the path of progress. 

A business model of buying to foreclosing would be difficult and my recommmendation would be to stick to conventional real estate as you cannot predict if and when you would get a property nor for what price.

Ask yourself questions like: What if we can't raise the lot rent as fast as we predicted?

Similar predictions have been made about real estate. 

Things move slowly in REI- we're in a recession that may get worse and you may find some respite for buyers, but a lot of seller's aren't interested into selling into a recession if we do in fact have the "V shaped recovery" so many have predicted...

At least for now, this is not the end of the world for rentals that many people have been predicting.

However, it is impossible to predict market cycles.

Out here in California (Bay Area), we have mild winters and summers and have experienced explosive economic and demographic growth such that predicting capex reserves is less significant than it is in the alternating snowy and humid Midwest. 

This has led to:* 37% of homes in the United States have no mortgage at all* Of the remaining 63%, 1 in 4 has more than 50% of capitalSo, even if prices go down (and most experts don't predict they will), most homeowners will still have large amounts of value in their homes and won't stray away from that money.

Eventually, a bubble will burst because of ever increasing prices and those investors who can't predict when to sell will lose their money.