In some embodiments, the sensor 125, the controller 110, or the two working in combination, may be able to determine that a specific signal is from a specific user that is known to the system. In such a case, the system (a database associated with the location, the sensors, the controller, or something else) may have access to preferences 135 for the user. This user may be an organization, a person, or an inanimate object with appropriate hardware. Using these preferences, the building may change state, i.e., the controller may stop, start, or modify resources to change state in the defined space. In an embodiment, there is an associator 130 which associates the personal electronic device with a known user; a preference storer 630 which stores at least one preference 135 associated with a known user; and a modifier 140 which modifies state (e.g., temperature, humidity, air flow noise level, lighting level, etc.) of at least one portion of the defined space, based on at least one preference of the user.

In some embodiments, the preference 135 comprises at least one of location, temperature, humidity, lighting, security, entertainment, personal services, or grounds control preferences of the user. For example, the user may be known to park in a certain parking space and walk into the building following a certain path. When the user's signal is picked up, lights along the user's preferred path may be signaled to turn on; any sprinklers along the user's preferred path may be signaled to turn off, and lights in the user's preferred office should turn on. In other instances, the signal itself is used to provide a location, and lights, sprinklers, etc., are modified depending on the location of the signal.