Settle a debate: what is a rent roll?

[Nate Smoyer]

A friend and I have different definitions as to exactly what a rent roll is. How do you define rent roll and what info do you include?

I'd love to know what y'all all think. I've seen varying forms being labeled as a rent roll. I'm on the side that there can be variations, but I'd love to know what y'all say a rent roll is, what info is on a rent roll and what is optional to include. 

Cheers!