progressive collapse is defined as the sudden load which lead to initial failure at local positions in the frames that may cause sequence reaction through the elements of the structure. seven story building is chosen designed under the gravity load as per ACI 318 Code. The building were analyzed to progressive collapse condition under two damage cases; corner columns damage, edge columns damage. The building is loaded as described according to General Services Administration (GSA) guidelines which require linear static analysis. The results show the variation of demand capacity ratio (DCR) of columns. The damage aspects in this research concerning the section size damage cases with 0% column loss (full damage), 60%, 80% of column section size. The GSA guidelines for atypical building with DCR values more than 1.5 indicate critical damage potential condition in the structural member(column). It is concluded that the effect of the reduction of column section size in specific plan A is decreased according to plan distance from the specific plan. The columns DCR exceeded 1.5 show damaged condition represent actual threat possibility with nomination C22,C29 and C23 in plans A and B which present mid column lower part of the frame.