What is the legal ruling regarding an intermediary (facilitator) taking a sum of money from bank clients in exchange for submitting and following up on their financing applications through a bank employee? Is this money considered lawful (halal) or unlawful (haram)? And what should be done if it is unlawful and has been used to build on a piece of land?

If the transactions that a person seeks to complete are permissible, then the commission received from them is halal (definition) (lawful) and it is permissible to benefit from it. However, if the transactions are forbidden, then the commission is an ill-gotten gain that must be disposed of by spending it on the welfare of Muslims or for the poor and needy, and it should not be returned to those who offered it. If he was ignorant of its unlawfulness and repented, then it is permissible for him to benefit from it. The unlawfulness of ill-gotten wealth pertains to the liability of the one who acquired it, if he was aware of its unlawfulness, and it does not pertain to what he consumed of it as property. If he was aware of the unlawfulness of the transactions, then he must donate an equivalent amount of what he gained from them to the poor and needy. However, if the transactions were permissible, or forbidden but he was ignorant and repented, then there is no blame upon him for benefiting from it, and he is not obliged to donate an equivalent amount of what he consumed.