Performance of distributed antenna systems (DASs) is investigated for high data rates transmission in high buildings. Downlink transmission is considered, neighbouring floors are grouped together and controlled by a central unit (CU). The spectrum is not reused in the floors controlled by the same CU, however it can be reused among floors belonging to different CUs. Therefore, co-channel interference occurs among CUs. Radio signals can propagate among floors in high buildings and reflections from a nearby buildings can have an effect on the performance. In this paper, the effect of the frequency reuse factor on the channel capacity performance is shown.