Generic interactive model for buildings with an experimental hardware and software tool is presented. It is targeted to user groups such as building automation designers, system integrators and service engineers. It is characterized as an integrated software/hardware tool for design, fine-tuning and monitoring of building automation, supported with both simulation and real-time monitoring facilities. The designer of the automation needs to be supported with tools, to verify the technical solutions under development, as well as the service engineer should have tools to find optimal parameters for control. For the implementation of such designer/engineer tools, a generic Virtual Model of the Building (VMB) is developed. The VMB consists of active objects (e.g. agents) all construction elements (walls, floors, windows, etc.) of an indoor environment, as well as artifacts embedded (controllers, sensors, actuators, software agents, etc.). All VMB elements are supported (tagged) with space coordinates in a local reference frame, to allow implementation of zoning, spatially targeted environmental changes and impacts. The concept considers the application of proactive context-aware models of indoor environments and automation systems involved in a multifunctional building.