"Seismic Performance of Irregular Multi-Storey Structures" is an illuminating exploration into the intricate relationship between building irregularities, seismic forces, and the angles at which nature's wrath strikes. Drawing from an exhaustive literature review comprising 5 standard codes, a comprehensive thesis, and 30 research papers, this book offers a deep dive into the uncharted territories of irregular structures and their responses to varying earthquake incidences. Amidst the wealth of information, three pivotal themes emerged: "Decoding Irregular Frame Structures," "Angle's Influence on Reinforced Concrete Structures," and "Unveiling the Realm of RC Moment Frames." However, the spotlight inevitably falls on the most captivating topic, "Navigating Vertical Irregular Multistorey Structures under the Seismic Spell of Changing Angles: A 2D Ground Motion Odyssey."