The problem is further exacerbated by the fact that when I get home I am also working a minimum of 40 hours in the shop getting the next project ready to ship offshore.....

You should consult with an agent or lawyer by the fact you are actually selling an option on your property $500 is way too little for the privilege and you need to get the buyers financial statements to even see if he is a possible buyer .On the surface it sounds like he is shopping your property around . 

you want to sit down with your HML before you go shopping.. at least that's how I would do it. 

I have an appointment with the City’s economic developer and with the Historical society to get more information as far as construction, and challenges with past developers that couldn’t or wouldn’t go farther with it.There was a proposed shopping mall at one point for this property that never went past the planning stage.

All the information that was told from him on that work shop can be found here.

Finding the tenant is the toughest part, most RTO specialists actually find the tenant first and then shop for a property with them.

I am 19 years old, am currently working as supplemental IT and do rapid prototyping for a machine shop, in addition to attending Purdue's New Albany branch for mechanical engineering.

I also am from Dayton and as Darrin said there's a good group that gets together monthly to talk shop.

500 give or take $50 is "normal" for a SFR, $700 is high, but as far as I know, you're not allowed to shop around for that 

Take pictures of everything, including the driver and passengers, and offer them to pay cash on the spot, of course it should be an amount that will definitely cover the cost, do not go anywhere without them, you must follow their vehicle and go to the bank and or repair shop for an estimate together.