50 vs 150 unit Bldg - Average net cash flow per unit per month

[Rory Cummins]

I'm looking at both 50 unit and from 100 to 150 unit buildings and just wanted feedback on what would be an average or expected  monthly net cash flow per unit. I've heard the standard $100 per door discussed as a conservative benchmark but just wondered everyone's thoughts on that, especially as it scales from 50 units up to 150 units or more. For the sake of this example, figure Class B or C apartments and typical mgmt & OH expenses.