In this paper, wind pressures on the surface of a tall-building complex, which is composed of main and secondary towers, are predicted using the numerical simulation technique. The effect of a neighboring tall building on the wind pressure distribution is considered. The predicted wind pressures are compared with the wind tunnel test results. It indicates that the numerical simulation well predicts the time-averaged streamline and wind pressure distributions. With the existence of the neighboring building the streamline distribution especially the number and scale of the vortices, and the pressure distribution are changed significantly.