With 10+ units you really can't assume that all of them will be empty, in need of repair and capex investments simultaneously.

If you get $5k from each property, you'll have $25k/yr in CF, and it will take you 4 years to recover all $100k...since all 4 properties are recovering only $20k/ea...and simultaneously. 

I immediately started a simultaneous deal probing.

@Mary Mitchell Many think that it’s because the market is up but simultaneously we are losing tradesmen.

This process was an out growth of a former, rarely used process whereby the buyer bought the property and immediately resold the property in what was called a simultaneous or back to back closing.

I will be occupying the downstairs unit with my girlfriend, and simultaneously managing the upstairs living situation.

Lastly, with the low down payment you do have PMI which will cut into monthly cash flow and simultaneously makes your cash on cash ROI go up. 

1031 experts; do foreigners still need a withholding certificate if doing a simultaneous exchange?

I came across this article about modular construction which can cut costs by 20% and speed up production by between 20% and 40%, since the build is unaffected by weather and foundation work can be completed simultaneously with the rest of the build.

(a) In this section, "cotenant heir" means one of two or more persons who simultaneously acquire identical, undivided ownership interests in, and rights to possession of, the same real property by operation of the applicable intestate succession laws of this state or a successor in interest of one of those persons.