The study is an analysis of tertiarization in Bucharest, a process that tends to become dominant inside an economic system that has faced the hardships of transition and reorganization. The study deals with tertiarization inside the industrial parks in the capital city, in close connection with deindustrialization and industrial delocalization. The study highlights the forms tertiarization has taken inside those areas, former industrial platforms of the utmost importance for the industry of the Communist era. The trends in the evolution of tertiarization are analyzed in comparison as well as from the perspective of the evolution of the companies inside the three industrial parks; in addition, two scenarios for the future course of tertiarization are included.