I'm buying a pre-foreclosure property as-is (condition is okay when home inspector checked it out) SFR (3bd/2ba) property at $325,000.

I see a lot of people ask really basic questions like "how much cash flow per unit is good" but don't specify the condition of the property, price, or location.

These investors tend buy homes in really good condition and may pay more for a property.

I will have approx. 7.2 to 7.8% ROI and is in good condition. 

So I found a bunch of 70s trailers in reasonable condition.

From what I have seen, appraisals run on comps in the area according to three things: square footage, beds/baths, and whether the property is in 'not-good, standard, or good' condition.  

Owners have no idea the condition of the house8.

Looking for mid-market, B/B+ neighborhoods, near turnkey condition.  

I compared it to three other units I could find that sold or were selling in a similar condition based on price per sqft.

These are notoriously challenging to predict because of unknown factors that could arise.I'd have to say looking at market conditions and what is expected in your local market can give a good insight to short term property value appreciation.