Remember that you want to find a deal that cash flows from Day 1 (with the exception of building in house hacking one unit where you have decreased rent), otherwise you are gambling on appreciation.

If I purchased a SFH for $30k I would be very happy.Along with that you would need to make sure that your cash flow calculation is accurate. 

I am trying to be as accurate and realistic as possible and certainly don't want to buy a house just to buy a house.

In reality, this is not going to be accurate.

Given the age and lack of amenities offered at these buildings, $750/month might be more accurate meaning that after complete renovations, this portfolio could gross $13.5k/month and $162k annually. 

The diversity angle alone cannot accurately assess the viability of your venture being successful.

I'm worried that I won't be able to accurately predict the total cost of this subdivision project.

It will help in presenting accurate info to a lender and will only increase your credibility.

I would investigate why the age is not accurate.

Event posts on facebook never are an accurate way to get a head count for an event as it cost nothing to click going or interested.So how many actually attend?