Finders fee for finding a land seller?

[Gustavo Munoz Castro]

Hi BP folks! Thought I'd tal into tour wisdom. I'm a Realtor, I only do residencial, I just got out of a listing appointment with a seller that is sitting on an OK home with over 1 acre of subdividable land, at least 5 lots, neighbor which can do 9 lots may also want to sell. I dont do land, but know some folks that do. What kind of finders fee can I expect if I put these folks together? Any rule of thumb? For residential I would ask for 25% of the agents final commission on the deal. I was also thinking of a flat $10K fee (my typical commission). Would love to hear your thoughts.