T There is a phenomenon of functional changes in housing area from living into commercial activity, generally oc.cured in the main corridor of area with heavy traffic flow. This phenomenon also happened in high cost housing areas such as Bintaro Jaya and Pondok lndah which cause serious problem for the surrounding neighborhood. The functional changes happened along the corridor of jalan Bintaro Utama 5 at the Bintaro Jaya residential area and along the corridor of jalan Pinang Emas I in Pondok lndah area. The question of this research is vmat caused the functional changes from living into commercial area along the corridor of jalan Bintaro Utama 5 and along the corridor of jalan pinang Ernas I. To answer that question, the factors considered are: policy factor, users who changed the function, and external factor or the surrounding neighborhood. Based on the result of analysis, it can be found the factors caused functional changes are: there is a lack of strictness in licensing for building utilization, the location of residential area, the hierarchy of the street, and characteristics of the occupants in the neighborhood area.