I am investing in rural areas of western NC and there are not many cookie cutter homes/developments so the 200K selling prices is based on a larger search area. 

Consider that the developer is combining my small 1 acre parcel with an adjoining 35 acres, and I estimate that his company will net between 7 and 9 million bucks after a few years' work and the sale of all residential lots in this project.

Are you going to wholesale or develop them? 

@Brian BurkeIf you have your friends run Ben's blog posts and Brandon's books through some analysis software, you'll quickly see Brandon is Ben's ghost writer.  

Do you currently use any software, like Quickbooks (desktop or online) or Xero?

Use them, but do not abuse them.Hang with people who are developers, investors and creative assignment experts.Cockeysville is a great Baltimore County area, I have done some transactions there.

In fact, most don't.In time you will develop your own numbers. 

I'm writing some software for myself to analyze things, and I'm curious if this is a dependable number that will stand the test of time. :)

--identify and choose online rent payment system--verify mailing address--determine how to turn one mailing address into 2 apartment addresses through USPS--develop packet for new tenants with utility phone numbers, my contact info, etc.These are a few off the top of my head, and certainly not inclusive.  

Developers have so overbuilt the rental market and the Parents/kids these days want such lavish accommodations that anything not new and shiny with a gym and a pool won't move as easily!