Working with a realtor's investor client

[Yasmin Goetz]

I just started to work a deal with a realtor that has a client that is looking for land for  commercial development and he(the realtor) wants me to find land for him. I am able to find deals that he can't. because he does not have the time to do so I feel I should make a contract to the realtor but should I give one to his investor also to protect myself? I am worried that the investor (whom I have not met yet) could try to purchase the land with out me.