Abstract: Available codes are not well-suited for tall buildings and are very restrictive. In this study, we try to assess parameters such as drift limits, rotation of plastic hinge, capacity-demand ratio, etc. which have a significant role in defining performance levels for near-fault regions. We have selected two-dimensional steel moment resisting frames having 30, 40 and 50 stories. These buildings have been designed according to IBC and AISC practice codes as Special Moment Resisting Frames (SMRF) and have been analyzed by Design Spectrum Analysis (DSA). We have conducted nonlinear dynamic time history analyses by using a suite of near-fault accelerograms to assess the performances of selected buildings. Finally performance levels of structures have been evaluated and estimated and near fault effects on different parameters which are not completely considered in spectral analysis are assessed. Using nonlinear analysis and evaluating performance levels and assessing parameters such as drifts and formation of plastic hinges and their rotations quantities, ratios of capacity-demand, etc. some weak points of customary design method are detected.