The fast-increasing world population is concentrating in urban areas. Today there are approximately 600 million housing units in the world. A fair portion of these units are apartments located in dense building areas in industrialized urban centres. The apartment building maintenance is an integrated subsystem of the urban system. There is a drastic increase in the productivity of maintenance when we institute centralized and rationalized apartment building maintenance system in place of traditional maintenance. The labour costs will decrease 40% and the technical maintenance costs 25%. With the acquisition value of organizing the system the total benefit of the centralized system is clearly profitable with all the possible interest rates and planning horizons.