This project outlines the structural design of a seven-story reinforced concrete office building following ACI 318-11. The framing arrangement and column locations of the building were provided based on architectural and structural requirements. The structure system of the building is a reinforced concrete frame with slabs and beams floor system. This report covers the design process in the following order: the calculation of the expected loads on the structure which is gravity and seismic loads , the design of the slab depth, the estimation of the column sizes, the design of the slab reinforcement, the design of the beam reinforcement for both flexural and shear, the calculation to check crack control, the calculation to check beam deflections and finally the design of the columns and footings reinforcement.