Abstract: A free-standing masonry wall having radial arms (illustrated and described herein by way of example as four in number) is constructed to a desired height (herein, two stories). The wall may be concrete blocks filled with concrete or poured concrete. A concrete slab may be laid extending perpendicular to each arm of the wall. Interior floors, ceilings and exterior room walls are erected and roof joists are supported by stud extensions of the masonry wall and the exterior and interior walls. The roof preferably slopes outward-downward from an apex directly above the top edge of the masonry wall. Economies in constructions and efficient use of land area are accomplished. Privacy of dwelling units, earthquake protection, fire hazard protection and heat and sound insulation are enhanced.