Due to structural effectiveness and potential for beautiful architecture, diagrid structures are frequently utilised for today's tall buildings. This allows for the study and testing of innovative grid designs. An irregular grid refers to the uneven arrangement of buildings in an urban or architectural setting, whereas a diagrid particularly refers to a building's structural structure, which consists of diagonal components creating a grid for support. The two ideas have to do with various facets of building construction and design. One of the grids selected for this is the asymmetrical grid. This study used irregular geometry for tall buildings, so identifying pertinent structural systems is essential for better overall performance. For this tall skyscraper, an irregular grid was selected for the outside grid. Analysis and design were carried out in SAP2000 for lateral loads. Various models were prepared for different geometries. Due to inclined columns lateral loads are resisted by axial action of the diagonal compared to bending of vertical columns in framed tube structure. Diagrid structures generally do not require core because lateral shear can be carried by the diagonals on the periphery of building. Analysis and design of 25-, 35- and 45-storey diagrid steel building is presented. A regular floor plan of 30 × 30 m size for square and 30 and 40 m for rectangular are considered.