Get it drafted by a lawyer and notarized and you should be just fine.Maybe offer a slight incentive such as a a few extra bucks when they move out if they don't execute the option to cover a fraction of their costs.

I've watched his investors make 15-25% on each flip while he pocketed a few bucks for his work.

Habitat should not be making big bucks from their dealings, and I would hope that you have more integrity than to take advantage of situations like this. 

I have one here in Maryland , I will give you 50 bucks to come and weld it .

(Leads aren't automatically sent to the agent, you must pay them big bucks). 

I'm not set on Dallas, I'm set on trying to get the most bang for my buck. 

Will cost 75 to 125 bucks in material and handyman can do it in a day. 

I'm a recent graduate of Ohio State University (go Bucks!)

Just as a every product as its own product life cycle : Innovation stage / Growth stage / Maturity stage / Decline, every city below is at different stages in its life cycle.

This can be excluded from your GC's scope, but be specific and the coordination will take some extra teamwork (i.e. maturity).