S​tructuring a commercial lot assemblage deal for a buyer?

[Account Closed]

I currently have one of my commercial properties in escrow and the buyers are interested in purchasing neighboring lots on both side for a large development.

The area is upcoming and gets a lot of attention from speculators and developers.

They tried cold calling the owners but got rejected. They are now turning to me and asking me to help them.

I have good relationships with both owners and perfectly know their properties. I actually already talked with them a while ago about purchasing their lots and they weren’t opposed to the idea.

I could eventually have a chance to put these two properties under contract if there is enough incentive for all parties. I know i could have wholesaled them at the same time i was selling mine but it's not my trade.

Lets say i’m willing to bother with this, what kind of agreement & fee / commission is acceptable for putting together such a deal without compromising my relationship with the buyers?