In modern cities due to the increase in vertical growth of structures, basement floors are mainly utilized for parking of vehicles and other utilities. The choice of structural framing for basement floors (mainly in non-tower areas) is strongly influenced by accommodation of parking spaces. The factors that are to be considered in deciding the structural form mainly includes the column locations, column spacing, column size and shape, beam depth and routing of the service systems. In the present work, flat slab system is considered for basement floors, as it offers several advantages such as providing minimum depth, large column free area, fast construction & flexible arrangements of services. A geometrically simple prototype of non-tower area with two basements and ground floor is considered from a realistic project of gated residential township. The numerical simulations of the models are carried out by finite element analysis program SAFE. Analysis is carried out on flat slabs supported on three types of column sections with circular, square and rectangular shapes. Furthermore, for rectangular columns the effect the L/B ratio (varied from 1 to 4) on structural response of flat slab systems in terms of punching shear ratio is presented.