Abstract: A modular building structure having a separately leveled base and individually connected modular panels is provided. The panel receiving base is interconnected and leveled prior to placing the individual modular panels therein. The modular panels are constructed from horizontal and vertical channels so designed as to create internal electrical and communication raceways within the partition wall upon connection of the modular panels. The outer surface of the partition is readily replaceable by removing snap-fit attached outer skins from the modular units. The removable skins provide ready access to the internal electrical and communication pathways and enable the rapid repair or replacement of the outer paritition covering.