Interesting question....not positive, but I suspect the higher rental concentrations are areas, naturally, of more multi family properties.....those with lower concentrations are likely more single family.

I am currently concentrating on north warren, sterling heights, Clinton Twp, Fraser.  

I'd recommend you concentrate on evaluation properties and seeing what fits your investing goals.

Realtors can be specific or concentrate on certain types.  

If it were mine, I'd concentrate on renting it out, and just ignore this issue.

Many of the buildings that had no users began to decay and fall into ruin, with high concentrations of such buildings in the Monongahela Valley.

Well after all said and done  this property  doesn't look like a good cash flow deal as everyone concentrate on here.Where do I find properties which I can scoop for cheap???

I have family in Chester County; hubs' daughter lives in Lehigh County, and his son lives in Schuylkill.What would you suggest for a better name that doesn't just concentrate on Reading?

I have a small business and mostly concentrate on that.

Was just telling my son (because of his poor grades in school) that I am 55 years old and EVEN I am willing to learn something new which he should concentrate at school, Learning :) And that you're never to old to stop learning even when you're out of school.