And/or assume that everything is trashed and you have to rehab the entire house.I have bought houses without going inside, but you can usually get on the property and look in some windows. check the roof, exterior siding, main panel, etc and get a pretty good idea of what the house will need.

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A property owner may need a roof on their house they can't afford.

I'm not sure if this is always a requirement or recent due to legislation against steep rent increases.

Multiple rental apartments under one roof are provided by multifamily buildings, such as duplexes, triplexes, or fourplexes.

Be careful though -- you'll often take a very steep haircut on the face value of the note if you shop it in the broader secondary market.  

I agree with Ken, get some costs and see if it's worth it but depending on how old the roofs are on your dwellings if you have a claim and replace the roof your rating might not really change. 

We are also seeing a steep rise YoY in bankruptcies across all chapters (both business and personal) which is another indicator of not only the direction of the housing market, but the general economy as well. 

I would focus for a listing price > $600k so you have more "space" for higher price.Also that 80k I'm considering the roof is fine.

If the resident has issues with the quality of the housing such as a failing roof or HVAC issue we would advocate strongly on their behalf as well.