I know it's considered the hinderlands but there are as many new projects ( I consider new post 2006) either in the ground or proposed within an 8 mile radius of Simpsonville as you have named for Greenville. I keep a running tally of any project announced within that same radius and have been doing so since 2005 and the total is now up to 1.5BILLION.
I recently had a Spartanburg realtor stop by Cotton Mill Place ( yes I am the developer) and he said that he has been tracking every angle of census data for about 2 years and the 29681 and 29680 zips of Simpsonville consistently are number 1 and 2 among more than 50 zips. He said he had heard of our project and came to see what in the heck was going on here. As a representative sample of everything else there are currently 5 recently complete, announced or under construction capital improvement projects with just churches! ( total is more than 20million)