The real estate investing industry uses "Classes" to rank property performance risk, but there's NO agreed upon industry model:(Here's what we use for our Metro Detroit market:Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

@Martti Eckert here's the big issue that no one really talks about that you hopefully find helpful (this is copy & pasted):-----------------------------------------------------------------------------------------------------------Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

And what is your price point and are you looking for turn-key properties or something along the lines of a "fixer upper"?

From a risk point of view, there is no real middle class and a very small upper class.

Are these Class C zip codes?  

And what is your price point and are you looking for turn-key properties or something along the lines of a "fixer upper"?

You have an envelope, printed with addressee (stick on address label says junk mail) two color copies, paper, first class postage. 

A handy search bar in the upper right makes it easy to find previous discussions, blogs, podcasts, and other resources.

On other side of coin, doing AAA; A-class assets, A-class tenants, A-class area.....

Self managing C class units can be very deceiving.