What constitutes a B or C property

[Nicholas A.]

I am trying to find a rubric of sorts that I can use to determine the grade of a property. I seem to hear what people think is a B or C property actually varies. Somebody told me that each unit between 50-100k would be a good marker, with good rent growth.

Ultimately I want to be able to figure this out so I know how to grade each property and each area. I am currently looking at Racine, WI.