Where a party seeks a temporary prohibitory interdict pending review of administrative action, but subsequent administrative action is taken that authorizes the very conduct sought to be prohibited, and that subsequent administrative action is not challenged and remains valid and binding, the applicant cannot establish unlawful conduct—the first requirement for a prohibitory interdict. Furthermore, where significant time has elapsed since the commencement of interdict proceedings, during which the respondent has continuously engaged in the activity sought to be prohibited, and the applicant has failed to prosecute the underlying review application, the balance of convenience cannot favour the granting of a temporary interdict even if other requisites are satisfied. An order prohibiting "further" construction lacks any factual or legal foundation and is not competent where construction has already been completed before the application was launched.