Need help on contract/deal??

[Prince Conley]

Hello Everyone 

Would love some input from the community on an issue I'm having.  I'm currently direct with an owner of a multifamily building.  Through a buyer contact I have a potential buyer doing dd on the property but no official information has been exchanged yet.  The buyer contact and I have a sub-fee agreement splitting commission.  The problem is the owner of the multifamily has told me what they want for the property.  I added my commission on top of what the seller advised they want to make from the property but I don't have a contract with the owner.  Do I set up a sub-fee agreement with owner/seller? Do I need some kind of contract with the buyer?  Open to all suggestions on this.