Wholesaling a deal that is owner carry

How would I do a wholesale deal that is owner carry? I found this property off market and do not have the funds or time to deal with it right now. It is a great deal with plenty of value add. Four different properties with a total of 8 doors. The owner has not raised rents for a very long time. Three of the doors are vacant. I want to have the buyer put 20% down, with 8-10% going to the wholesale fee. Is there a way to not to have to disclose what my fee is going to be to the seller? If so, what would that contract look like?