The author questions the significance of the principle of proportionality, which serves as a constitutional benchmark for the nature and extent of state interventions in the fundamental rights and freedoms of citizens. He particularly addresses the issue of whether and to what extent the application of the principle of proportionality in administrative law involving multiple parties, with a reduction of discretion, differs from its application in the 'classical' two-party relationship. He identifies significant modifications in the meaning of the individual sub-principles of the principle of proportionality and ultimately confirms the theoretical findings using the example of public law demolition.