Should a Developer Pay Broker Commission on a Deal Upgrade? Real Case and Solution

"💬 Question from a fellow broker: The client entered the deal, and 3 months later the developer offered an upgrade — to increase the area. At first the client refused, but the broker reworked the option, convinced the client, and agreed the terms. The deal grew by +30%. When the broker requested commission on this difference, the developer replied that it was a "technical matter" and they would not pay. The broker believes: without his work, the upgrade would not have happened, which means it is a full additional sale and commission should be accrued. ❓What do you think? In your cases, did developers pay commission on upgrades or not? UPD: The developer paid the additional commission "