Is a commission due to the broker after purchasing a villa directly from the owning company, given that the broker did not present the villa that was bought?

The default rule is that a broker is not entitled to their fee until their work is completed. However, if custom dictates that merely guiding a person to the owner is considered work for which the guide deserves something, then they are entitled to what custom has established, even if the person does not buy the apartment they were guided to, but rather another one from the same owner. This is because what is known by custom is as binding as what is stipulated by a condition.