Abstract: A building system or combination of building structures which comprise panelized edge connected elongated rhombic triacontahedral structures for the roofs and walls, the walls being elongated vertical panels. The structures include hollow extruded connectors for joining the panels together and in some instances for joining the building structures together as a single unit. Externally the connectors are relieved to provide a flush surface appearance with the panels. The hollow connectors create strong lightweight structures with integral conduits for utilities. Tie downs to retain the structures in place can be threaded through the hollow connectors.One important optional feature is a foundation provided by vertical panels partially buried in the ground. This option provides a substantial improvement in the control of heat loss from the structures at minimum cost.