Seismic hazard refers to the potential for earthquakes to occur in a particular area and cause damage, based on factors such as the frequency, magnitude, and location of past earthquakes, as well as geological conditions. Areas with high seismic hazard may experience more frequent and/or more intense earthquakes, making it essential for residents and authorities to take appropriate measures to reduce the risk of damage and loss of life. Damage mitigation involves implementing measures to reduce the impact of earthquakes on human life, infrastructure, and the environment by different methods. The paper investigates the ability of base isolation and energy absorption systems using lead rubber bearings and fluid viscous dampers to protect the structure by controlling seismic response. Concrete building structures of regular type with various plan dimensions have been modelled in SAP 2000 for story heights of G+5 and G+15. Seismic responses e.g. base shear, isolation ratio etc. have been compared for the conventional and isolated/damped structures of different aspect ratio (plan/height) for each of the building models with same seismic considerations. It has been observed that depending on isolation and damping ratio base shear can be significantly reduced and for G+5 and G+15 building an optimum zone between isolation/damping and deformation can be selected for economic seismic design.