The city of Teheran, with its 11 millions citizens and its commuting system, makes of the urban chaos and the multiple chances for international exchange its remarkable peculiarity, supported by the local tradition for commerce and the presence of quiet spaces for relax and socialization: rising from these considerations the concept tries to give a suitable architectural answer yet responding to the functional and programmatic requirements. The space is defined by a materic shell generating from the street in a chromatic continuity of the matter: the urban street turns in different points without solution of continuity, forming the entrance level, the limiting wall of the block, the shield and the façade facing the street. A single continuous surface forms the shell containing the whole functions, becoming the interface with the city and creating an environment that is protected but yet closely linked with the chaotic context. On the inside the functional program unfolds into overlapped prismatic volumes, corresponding a single function to each monolithic block, using an uneven volumes disposition to create a public vertical multilevel void between them and the black distribution core surface, having at the same time an intimate series of semi-public areas facing the drilled black surface and boasting unexpected dramatic views and perspectives towards the city, perceivable but filtered through the openings of the main façade. The solid shell is covered in black drilled grc plates to create a continuity with the sideways paving as well as with the street surface and it is variously perforated: in some points of the solid distribution core surface, to allow the underground freshened/heated air to circulate and to maintain the natural ventilation of the internal space; on the plan roof, to allow the natural air moving and refreshment inspired to the Iranian wind towers, and to let both the meteoric water (which feeds the pools of the public spaces) and the typical zenithal light of the of Iranian buildings traditional interiors to get into the central void; on the main façade, in a top-to-bottom climax to obtain the complete dematerialization in the lower part, to achieve a strong attraction effect for the people walking by Vali Asr, virtually moved into the structure and enchanted by the quiet spots inside it. The drillings density follows a scheme that translates in a contemporary language the geometric motives of the Iranian gratings and patterns, to recreate moving scenarios shining with light glowing from the inside, where the sunbeams and the scattered light blend with vibrant shadow generated by the irregular drilling. The prismatic volumes are reciprocally disposed to create squares, gardens and water pools at different levels, piecing together a vertical bazaar where the richness of traditional business spaces is repeated according to a three-dimensional scheme; and where the two major dichotomised and complementary characteristic of this space take place: the chaos of the main commercial streets, generated by the irregular overlapping of the volumes, and the quietness of the surrounding squares, gardens and water pools laying on their coverings. The prisms external surface consists in a light highly-insulating translucent polymer, strongly contrasting with the outer black materic drilled surface, to create a looking like monolithic diaphanous structure due to the reflective monochromatic opalescent skin, built on the rim of the darker shell, assuming and reflecting its coloration. The only coloured element is represented by the company directional level, using Benetton green tonalities, externally showing the nature of its business mission. Moreover, the embossed inscription and the waterfall become both identification signs for the company and urban landmarks on the whole Vali Asr, from which is easily spotted. The water blade falling from the green volume descends to the ground and signs the passage from the chaos of the city to the quiet inside spaces, leading into a sort of immaterial corridor towards the main distribution system, completely independent from the two first levels fruition of the retail spaces. The outer shell metallic structure, covered in grc plates, and the one of the internal volumes covered with polymeric plates and glass, allow a high pre-fabrication and standardization level, strongly reducing building costs, and so does the use of an high percentage of dry assembling. The outer shell holds different important energy saving functions: it creates fluxes of natural ventilation using the “wind tower” effect; it dims the direct sun light in the interiors, filtering stronger-hotter rays and letting lighter rays in; it collects meteoric water to feed the pools and for the maintenance of the roof gardens, even for sanitary re-using; it works as a frame for photovoltaic and solar-cooling panels. On the street several eolic horizontal turbines let the air flow underground, where it is filtered and naturally freshened/heated, allowing the conditioned air to flow up (by a gap of pressure or turbines) along the tech wall in order to be redistributed at various levels to air-condition the inner vertical multilevel void, making the eolic turbines placed inside the black tech and distribution core work and generate energy using natural air flows. The drilled plan roof shields the functional prisms from direct sunlight, especially southwards, so that they can be made of trans-lucid material or completely transparent, depending on either the functional or communicative aims. Facing south, the lower levels are protected by the artificial waterfall that shields in a scenographic way the most exposed volumes. The water comes from the upper pools, in a continuous cycle with the underground storage that preserves and filters the meteoric water collected from the cover, and circulated again using the pump fed by self-generated energy (photovoltaic and solar panels fitted in the thick layer of the roof, eolic turbines). During the winter the natural airstream, due to a pressure gap, flows underground (where the temperature is constant all through the year) and allows the creation of a warmer microclimate in the inner public vertical void resulting in energy saving for winter heating. Moreover, due to the particular form of the outer shell, the particularly low at the horizon sunbeams can penetrate into the living spaces both from south and west, warming up for irradiation and enlightening spaces. The presence of deciduous vegetation allows the mitigation of the summer heat without effects on the winter light, and will also filter the great quantity of CO2 coming from the busy Vali Asr and create oxygen in a chlorophyll photosynthesis process.