Because of certain norms in the marketplace, we can use a formula to answer that question if the transaction is a residential purchase or sale. Usually, the referral fee will be 25% of the commission that is received by the company at which your broker works. At least 70% of that referral fee goes to the charity of your choice. For commercial leases, we can’t tell, as a rule, what percentage of the commission the referral fee will be because commercial leases vary so widely in their length.