Google commission agreement between brokers and you will find several examples that will satisfy what you need. Choose the one that best fits you. Perhaps run it by a trusted attorney, or your managing broker, if you need to.
Have you checked the following form offered by your Association of Realtors in your area:1) Commercial Registration Agreement Between Brokers (Form TAR 2404)
If the other broker is concerned, ask him for a copy of the form he typically uses. A word of caution however in providing him all of your principals information. A cooperating brokers agreement should be sufficient as you have your client's obligation to pay in the listing agreement.
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