In this publication are formed the main technical and economic requirements for system management of a commercial office building, consistent with the basic criteria for comfort and easy maintenance. Consider the formation of the organization and the functionality of the hierarchy system management of the power system by specifying the functions and allocation of tasks to solve all subsystems. Proposed is a structure and technical implementation. It is provided development of the system vertically, as a subsystem of a larger system. Resolved tasks are monitoring and management of the power system, automatic changeover and control and dialog with operator for emergency situations. The proposed subsystem implements manual and automatic control mode, local and central control.