Modular wall unit system

A modular host system may include one or more processors and a host unit installed in a support structure of a building. The host unit can be configured to receive and house an accessory (e.g., modular accessory) and electrically couple to an electrical source. The host unit can include a power gating module configured to couple electrical power from the electrical source to the accessory, and a communication module configured to communicate with one or more additional host units installed in the building. The one or more processors may be configured to determine a distance between the host unit and each of the one or more additional host units based on the communication with the one or more additional host units, and determine a floor plan of the building based at least on a distance from the host unit to each the one or more additional host units.