FHA makes no such distinction, up to 4 units you can do 3.5% down.

I only assumed it was owner occupied because the mailing address for the owner on the tax assessor page is at the property itself, which is usually how the city makes the distinction as far as I know.I'm glad to hear you checked out the area.

We can usually do the whole routine of 'move out, move in' in under a week while working our normal jobs for under $1k.The closest idea that I can find is this: https://passiveincomemd.com/buy-one-property-a-year-and-retire-early/(main distinction being that we live in these houses and pay a lower DP)The specific questions that arise in my mind are as follows:Why don't other people do this? 

I haven't had any sound-transmission problems in the duplex, as you might imagine.But way back when I was a student, I distinctly remember living in a cheap basement apartment with nothing covering the exposed joists overhead being forced to listen to all sorts of activity upstairs.

The key distinction that I'm aware of is that PMI is on conventional loans and MIP is on FHA loans. 

One simple way to achieve your goal is to create a new and distinct LLC for each deal that you do with a money partner.

For example, the market (that is, the collection of serious buyers and sellers) for $100K properties is entirely distinct from the market for $1M properties.So, do the math and know your market!

I t seems to be you've gotten into the weeds making no distinction between a sewer and water main lines.

It is not set up to give you a distinct advantage in building an entire rental portfolio.

Leveraged interest income is still subject to UDFI.Either way, kind of out of the context of why I hopped into this thread, which was to clarify that there is no distinction between an IRA or 401(k) with respect to the receipt of debt-financed income in the note space.Debt-financed income to a tax exempt creates UDFI exposure, with the sole exception being debt-financed income to a 401(k) when the debt is used to acquire real property.