I would first look at my personal lifestyle and see what I and the Misses could agree to on a 5yr plan for getting our personal spending as minimized, and budget regimented as possible, to create maximum net capital from our active working. 

If you can wait out short term minimal cash flow and hold, you'll be very happy.

But more frequently those who appear to scale portfolios quickly are either lying as Chris correctly stated or are highly leveraged and/or are fee developers who own minimal ownership interest and are backed by LP equity.You also shared your objective of holding your assets for a long period time.

While multi-family units can offer higher cash flow, they often come with increased management complexity and tenant turnover, aligning with your goal to minimize hassle.Investment Allocation: With a budget of $300k, diversifying across several SFHs in Raleigh could maximize both cash flow and appreciation potential.

I would do my best to minimize the time the shower will be down, press the repair crew to do it in one day.  

most standard lease agreements have a clause against sublets/sub lease but the more working class the area the easier it is to find rentals with minimal stipulations.  

I can refer you, if you'd like.That said, the others are right - you are quite close to a break-even / lose money proposition on this deal unless you can minimize the costs to finish it and sell it.

I'm not too concerned about the structural integrity as the two that see water are 20 year old metal buildings and the flooding is minimal intrusion.

This can be something fairly minimal, so long is it produces legitimate income that you report on your taxes, such as with a schedule C.  

Planning your tax minimization strategy 25 years ahead of time!