Their was an agreement between the tenant and this commercial broker done 15 years ago but it's been lost. Supposedely, it said commissions were to be paid for options too (of course the tenant doesn't pay the commissions). The contract between myself and my broker (listing broker) clearly stated that there would be no commissions paid on option extensions so we know my broker isn't due anything. The lease agreement between myself and the tenant protects the brokers and their commissions including option periods. However, it is completely silient as to what that amount is. Thus, I come back to what is customary for an option extention of 5 years after the first 15 years. There is no place that says what the commissions are for option periods other than a statement to return to the original commission agreement (which was lost). Hopefully, this helps clarify things.