Looking to Invest in San Antonio. Any Areas I should avoid?

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Through the map search function on HAR.com, I've found lots of duplexes for sale in San Antonio and at great prices. However, I am not familiar with the area and , thus, not sure where I should stay away from. I do plan on seeking the advice of a Local Realtor but in the meantime, can anyone recommend where to stay away from? Also, what are the rents like in San Antonio for multifamily? thanks!