Cash Flow Analysis from Investor Perspective.

[Micah Lynell Mortag]

I'm selling an investor/ clients Duplex in Atlanta that is currently rented Section 8 for a total of $3600 ($1800 each side).  The property has some tenant damage but it is not what I would consider a rehab.  Condition is "fair"   I have run comparative market analysis to come up with a value based on recently sold in the area.  I would like to know how an investor would analyze this property form a cash flow POV.   I have MY method, but I would love to hear others...  

PITI (20% down at 6% interest) > $3600

Thanks in advance!