Is taking a sum of money in exchange for mediating the rental of a closed shop attached to a house considered bribery?

If the company does not need to rent the premises, then paying money to one of the employees to do so is a forbidden bribe and an unlawful appropriation of wealth. However, if the company needs it, then paying money to someone who sought to finalize the contract is not considered a forbidden bribe. But if the person seeking to finalize the contract is an employee of the company, then it is not permissible for him to take a commission without his company's knowledge if that is part of his work and he receives a salary for it, because that falls under the category of gifts to employees.