Abstract: A system for accommodating people for any of numerous functions, such as housing, schools, offices, hotels, etc., including one or more generally rectangular modules which can be arranged to afford maximum flexibility in both spatial orientation and interior and exterior living space. Each module comprises top and bottom preformed shells which receive the upper and lower edges of vertical wall sections. Each module is supported in a cantilever fashion by a plurality of columns spaced in a predetermined configuration which support the entire structural load of the module so that exterior and interior wall sections can be selectively chosen during fabrication to include windows or doors or as solid, opaque members (or be omitted entirely). Modules can be vertically stacked in a variety of configurations, e.g., displaced at 90.degree. angles to one another by aligning and connecting the columns of a lower module to the corresponding columns in the module immediately below.