<p>This study investigates the progressive collapse behavior of an irregular building situated on sloping terrain, with particular emphasis on the effect of column removal location. It also examines the role of bracing systems in enhancing the structural robustness of the building. The objective is to evaluate the vulnerability of such structures and identify effective mitigation strategies. A nonlinear static pushover analysis was carried out in ETABS using finite element modelling, with scenarios involving the removal of columns from different strategic locations. Various bracing configurations, including bracing at different story levels, were analyzed to assess their impact on collapse resistance. The results revealed that column removal at the center of the longer edge triggered structural failure due to a lack of alternate load paths, making it the most critical case. In contrast, plastic hinge formation remained within acceptable limits when columns were removed from corners or short edges. The results indicate that the incorporation of a bracing system at top storey enhances the progressive collapse resistance of building by reducing the vertical joint displacement at the top of the removed column by up to 78%. The top-story bracing configuration significantly improved structural stability, showing no collapse hinge formation and the lowest displacement at column removal points.</p>