Building system based upon preformed modules

A preformed reinforced concrete building module comprising in combination:

• a rectangular shaped reinforced concrete panel having integral concrete border framework ridges about the panel extending perpendicular to the reinforced concrete panel thereby leaving an empty void space as deep as the framework ridges within the framework ridges, said ridges presenting at least four substantially outermost rectangular corners having a metal corner plate integrally embedded therein said corners, said corner plates being located only at said outermost corners thus providing an outermost member unitarily interconnecting side-by-side panels into sets by welding of the corner plates.