I was wondering when building your buy and hold investment properties, what sort of numbers do many of you typically look for with the deals? 

I am specifically talking about cash on cash and cash flow per unit.

For example,

A duplex I am evaluating will create an expected $195 monthly cash flow per unit or $390 for the building. An expected 14% cash on cash return. 

I know it is all personal about what you are willing to accept, but I was just curious what others are looking for with their deals. I need a sanity check as to whether my expectations are set too high or aren't high enough.

Thanks in advance for the responses!