My first rental property was a better area in a Rough (D) City. In other words, investors consider my City a bottom of the barrel "D" market. Gangs, Drugs, Heroin addicts everywhere, Violence, Corruption.
However, I purchased the property in the better area of this city. Out of town people consider the entire city to be a bad investment (hell hole) but local residence stated that my area was the "better area" of the City when I did research. Thus, making it C/D borderline area not a war zone. I have section 8 tenants and the property CASH FLOWS every month and I love it.
Every city has Market areas and MICRO MARKETS. You must study the CITY inside and out literally. I was an appraiser in the county which helped but I really dug deep and spoke with landlords, property managers, brokers and most important Police Officers to determine the better areas of the city to invest and it worked. You can go to lower class areas it is how we make money. The interpretation of market ratings (A-D) is very subjective and opinionated from one person to the next. You need data and conversations with local professionals do verify the difference in areas. Last but not least SCREEN SCREEN SCREEN TENANTS