Evicting them, even after purchase, could be a lengthy and costly legal process.

Single.

I'd recommend looking at costs. your build cost is going to be well over other homes because of the fixed costs like slab, Hvac, roof, etc. check the market drivers and weight the benefits of short term versus long term. long term is no furniture and help pays mortgage but at this size it doesn't really cover everything. we didn't find a lot of economies of scale in single family detached. can you build more than one unit?

It's either going to be a single family live-in flip or a duplex/triplex situation.

It is sad that no enforcement can even go after their fraudulent business practices. 

A majority were single-family investors.  

At a high-level, I'm looking for a single page that will show the entire health of the property, from income/expenses, to debt coverage, capex, ROI, etc. 

Great question - 20% down is the typical down payment for investment properties, regardless if it's a single family, duplex, tri or quad.We have a 15% down option for the same type of loan.

Also, focus on 2 years of job/income stability.Class D Properties:Cashflow vs Appreciation: Typically, all cashflow with little, maybe even negative, relative rent & value appreciationVacancy Est: 20%+ should be used to cover nonpayment, evictions & damages.Tenant Pool: majority will have FICO scores under 560 (almost 30% probability of default), little to no good tradelines, lots of collections & chargeoffs, recent evictions.

We currently have a single family home we rent in the North End of Manchester.