-Use a crime heat map to see how an area is, or the STL post dispatch murder map. 

The answer is likely not many because once they build a successful system, they move to teaching and training...they got murdered on taxes and figured out they had to do something else...and BRRRR is not sustainable...just think more about what you are doing with BRRRR...it's a buzz word, not a long-term strategy. 

@Michael Swan  sounds like you have a plan... what most west coast folks just need to be cognizant of is mid west rentals are NOT west coast.. and one can get sucked into thinking a 10 cap is as easy to run as your 4 cap .. and many have broken their picks and come home with their tails between their legs.. one must be very careful picking MF in those markets... of course there are great properties but there are areas an properties that are simply almost impossible to make work and they are constantly changing hands once the owner figures out rents are near impossble to collect on a consisitant basis or that CAP EX murders them..

What I usually do is only display the really heavy stuff - murder, armed robbery, etc - to get a better idea of how rough a neighborhood is.Some stuff from another post I wrote, about actually visiting the neighborhood:Do other houses have bars on the windows or "cages" over the outside A/C units?

For the IRA folks that do syndications, there is the mysterious UBIT/UDFI taxes (Yes, there is a tax inside the IRA). 

I reached the same in the last year or so, and  I've been pruning my portfolio to get rid of these really big houses that are murderous on make ready.  

Whether this means getting a MFH for 25,000 and rehabbing 50,000 into it, or buying for 60,000 and only rehabbing up to 15,000 is still up for a mystery, but those are pretty much the numbers I'm comfortable with. 

To much mystery and you will never know what you are getting into.

This is a relevant thread that might help you.What amazes me are how many classes offered on finding a property for investors (i.e. the murderously difficult job of wholesaling in this climate) compared to finding money for the investors to buy the property with.

Depending on what block on Throop you could be buying in the highest crime heaviest murder area of Chicago.