When buying a siblings half of a shared property out of an Estate is it customary to take realtor commissions into account when negotiating the price?

My brother and I own a property together that is still in my father's which we are desperately trying to close out. I want to buy his half. We have a court ordered appraisal which has set a supposed market price the property would sell for. In negotiating I would like to get a credit for the amount that would go as realtor commissions since if I decide not to purchase the house it will go on the market with a realtor. Is this something that is done? or taken into consideration,