Abstract: One embodiment of a southward facing trapezoidal shaped passive solar heat gaining building with basement walls used for heating the building on cold days, and cooling the building on hot days. The specially colored blinds FIG. 4, and shade 24 are features to aid the building in using nearly no energy for lighting, heating, and cooling. Upside down U shaped basement wall 40 and 42 are a unique feature that prevent leaks. This building, when elongated outward in the form of a large store, has parking along its perimeter allowing for time saved in people walking to and from cars, and saves conveyance waste in the form of a large manufacturing plant being able to have trucks deliver parts very close to the place where the parts are needed. Incidentally, because the building may be long and narrow and not square, it is safer if it catches fire because people can exit drastically quicker, and fire trucks can park near the fire and reach it quicker to put it out quicker.