The house’s program was organized in two perpendicularly overlapping volumes with a regular 350x350cm grid (hence the name of the house) in steel structure. Most of the columns are located in the perimeter of each volume. The social and areas are located on the ground floor, with its two largest sides facing north and south, where the swimming pool is located. Meanwhile, the upper volume houses the bedrooms, with all of its openings facing the morning sun. Two sections with 7-meter-long cantilevered ceilings at each end of the upper floor create covered areas on the ground floor that serve as an extension to the veranda on one side and a carport on the other side. Motorized, retractable and translucent awnings were positioned in all the openings. They allow the control of natural light and adjustment of the desired privacy. While all the floors on the grond floor level were built in cast-in-place concrete, the floor slabs on the 1st floor and the roof are built as “steel decks”. All internal walls are “dry-walls” , while all walls on the external perimeter of the house were made of common masonry.