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My primary residence is a Baltimore city row house in a desirable neighborhood.

You need money in your checking account.You say you don't want to sell and desire to buy more properties.

I've found Rentometer.com to be accurate (as it averages historical rent data from 30+ nearby locations near your desired address.)

.  ;-)  The December rental was an aberration, if your properties are in desirable areas.  

That is something I will never take for granted.2nd, if by your definition, you say the area as "crappy", and that isn't your desired "Strategy", then what you are describing is what a refer to as a "shiny object of distraction".3rd, and this is important, stop referring to things as "too good to be true".  

Assuming there are only 3 categories:Class A would be Upper Arlington, Dublin, etc - extremely desirable by allClass C would be the Bottoms, South Linden, Driving Park, etc - undesirable, lots of crimeClass B is somewhere in the middle.

I am a pastor and adjunct professor who desires to create residual passive income from real estate investing. 

Im currently looking at a house whose asking price is 200k, rehab costs est 20k So with the flip formula and desired profit of 20k.

However, when people are interested in the downtowns it's because the burbs aren't meeting all their needs or desires.