Wholesaling a commercial property

[Quinton Hagins]

So i recently came across a property in downtown Lawrenceville, Ga. The owner posted a FSBO and i contacted him asking if he was willing to sell. i am completely unsure on how to run comps on this property. its strictly commercial, it used to be a barbershop. how would i go about not losing this lead and making a solid but fair offer in which i can wholesale it and still allow the buyer to make a profit? Thanks in advance for any help.