Earthquakes in urban areas can cause the collapse of façade components, projection of hazardous debris, and obstruction of emergency access routes, resulting in significant secondary losses. This study aims to design and evaluate an openable and closable auxiliary façade inspired by traditional Iranian girih geometry to control the debris fall zone during earthquakes. The research is applied-developmental in purpose and adopts a quantitative-analytical approach based on computational simulation. Modeling and analysis were performed using Rhinoceros, Grasshopper, and Karamba3D. Grasshopper was employed to generate and compare design alternatives, while Karamba3D was used for structural analysis and evaluation of forces and deformations. Four geometric patterns derived from Iranian girih geometry were assessed under seismic loading conditions. The results showed that the Chaharlangeh pattern exhibited the best structural performance, experiencing the lowest force value (146.96 kN) among the investigated alternatives. Furthermore, evaluation of the distance between the auxiliary and main façades indicated that a 1 m offset provided the optimal performance, resulting in the minimum debris dispersion radius (28.28 m). Graphene was introduced solely as a proposed reinforcing material for the system membrane due to its high strength-to-weight ratio and flexibility; however, its performance was not independently simulated or evaluated. Overall, the findings suggest that the proposed system can control façade debris fall patterns and reduce the likelihood of blocking emergency access routes during earthquakes.