Cash Flowing Multi Family Investments -- $100/door?

[Kevin Mellor]

I’m a new member to BP (and soon-to-be investor), and I’ve attended (or viewed later) a few of the webinars. I have learned lots from each of them. My brother-in-law suggested I listen to the podcast as well, and instead of jumping right in with show number 160ish, I started at the beginning. I’ve reached show 40, and heard the tip about the 50% rule for analyzing multi family investments, and stumbled upon this question...
I have heard Brandon Turner suggest earning between $100.00-$150.00 per door as a goal, but I wonder about the ratio of loan to doors, and how that changes your goal. For instance, in a recent webinar “How to Make $1,000,000 Through Real Estate Investing” I believe Brandon suggested cash flowing $150/door with an investment of around $100,000, and again in his post “How I Quickly Analyze an Investment Property ” he suggests a cash flow of $100/door and an investment of about $100,000. I doubt you would be happy with the same $100/door if your initial investment were $500,000 or more. Also, would this hold true if you were to analyze a duplex instead of a 4plex? Would someone with more multifamily experience dive a little deeper on this, and perhaps comment on what happens if your initial investment is higher than $100,000. Would you recommend a "per-door multiple" of $100-$150 per door, per $100,000 investment (if it is a 4 door property) = $300,000 should yield $300 to $450 per door.  

Would you recommend $200-$300 per door if the same $100,000 investment if it were a duplex? Would you recommend a $500-$750 per door if it were a $500,000 investment. Thanks!
Kevin

[Jeff B.]

For my 6-unit MFU, all those numbers are lower than my actuals.

I think that NOI/Door is a good example of "an economy of scale", where the more doors per property, you should expect more NOI/Door. The costs are nearly fixed while yet the income is additive. For example, and average rent of 825 yields an NOI of 3465/door (for me with 30% expenses).