(Unless you buy a bad deal, don’t do that ;) )

I suspect that in San Diego there is a very strong correlation of rent rates to quality of area (B class, c class, etc.) and less so on the quality of the units. 

The bad part is that it was a conditional approval.  

Buy high quality assets in areas with high demand so my assets value goes up and my rents go up a lot over time.

Military markets have their unique qualities but generally speaking I think they’re a worthy area to invest in.

Make sure the audio quality is good. 

If it really goes bad you can always take something with quick loans like paydayloanstexas-tx.com and you'll have some time to get it all together and figure out what to do next.

I’ve had a bad experience.  

what are some of the pros and cons of buying a duplex in the bad areas of town.

The big thing you are overlooking is that when you buy something in that range of 20-40 units you will struggle with finding quality property management, which is why people go after 100+ unit deals.