You want to add to your regular inspections some attention to looking at the walls to mention that they are not for writing or painting on (obviously if you see this happening).  

My regular personal biz is a little slow, and my monthly nut is very high, I'm finding myself too close for comfort as far as the amount left in my bank each month, especially after April, with both property tax and my personal that was due!

It gets tight when my regular biz slows down.Bob BVenice CA

So there are MUCH more knowledgable people on the REI side of Fresno, but I've lived here for a while and drive through many of these neighborhoods routinely for work.  

To regular residential agents your deal looks like a whopper to them.

You need a place to live so there is a certain amount of rent that you must be able to handle as your rent so figure that into the mix and  treat your self like a regular tenant to figure the deal.  

I'm not a fan of Zillow, but if you're looking for comps they are very accurate as this is pulled from county records and the areas I invest are updated very regularly.

The only concern I have with this method is not being able to get regular mortgages in my name after I get too many.

One of the contributing problems was the lack of regular clearing of the gutters on the property and adequate maintenance.  

If you can find a lender that understands what you are doing and that routinely works with investors, you could include them in your future planning for deals and positioning of your assets.