The larger tract we can find then the economy of scale kicks in. 

.---------0 Down – Moderate/low income tract – which is where there is house is locatedPurchase Price $209.9KInterest Rate: 5.75%; 30 yr fixedP&I Payment $1225Add $300 for property taxes and insurance….I said payment of $1515 on the phone, but rounding up $1525 should be safe, not know the cost of insuranceNo PMI and we waive our $795 Lender Fee.5% Down Conventional Purchase Price $209.9K and loan amount of $199,405Interest Rate: 5.50%; 30 yr fixedP&I Payment $1132 + $73 PMI + $300 taxes and insurance =’s $1505 total paymentYou would have the $795 Lender Fee too.FHA 3.50% downPurchase Price $209,900 and loan amount of $206,100.

This is a HUGE change for a Census Tract that was one of the poorest in the nation, just a few year ago.  

There is a program that allows you for zero down payment mortgages if the census tract has a high minority >50% or moderate / low income. 

For example in a tract faster and easier, on acreage historic house in USDA limits longer... 

These investors purchase homes when developers are building tracts of homes and the investors purchase the homes with they are in the building stage and sell the homes before they are built.

Did you call Realtors in the tract to see if they knew of any comps?

Lots of medium to large tracts that were inherited and forgotten about by out of state or big city heirs.

I read an article that Blackrock is buying all the houses and new housing tracts with taxpayer dollars to the tune of over 30k houses per year.

They generally only rezone larger tracts of land as part of their long-range land use planning process; They do no re-zone individual parcels just because the owner wants to build something non-conforming.