@David Lund
Cash flow is in large part a function of LTV on your loan. Put less money down and your monthly payment will be more, and there for your cash flow will be less. Put more money down, payment will be lower, and cash flow will increase. Of course there are other factors too. As for my criteria I look for all of the following (minimums):
Cash flow: $1000 per door. This is accounting only for PITI, and HOA if any ( Cap Ex, vacancy, management not accounted for).
Cap Rate: 10%. Does not account for CapEx or management. Yes I know single family houses are not typically valued/appraised using cap rates. But I do.
Cash On Cash return: 20%. This assumes 25% down, and accounts for all closing costs/purchase transaction costs, and all rehab costs/initial repair costs. Does not account for CapEx, or management.
All that said, some of my earlier purchases don't meet all of these criteria and many of my more recent purchases meet and often exceed these minimums.