When an earthquake occurs, the structures undergo inelastic deformations. If the structure does not have adequate ductility, lateral stiffness, and strength, then it suffers a lot of damage threatening its safety. Using base isolation in structures, the safety of the structure and its occupants can be enhanced. The purpose of this study is to investigate the behaviour of base isolated building. A nine-storey building is modelled both with and without base isolation for the purpose of this research. High-damping rubber bearing have been utilised for the isolation device, and the device itself has been mathematically modelled. The time history analysis of both of the models was done and the responses; lateral displacement and forces were determined and compared. The fundamental time period of structure was increased from 0.68 to 2.56 s as a result of the base isolation, which also resulted in a 62.14 percent decrease in base shear.