LOZENETS RESIDENCE is an exclusive multifunctional building located in one of the most prestigious neighborhoods in Sofia, a project by a French-Bulgarian architects with worldwide achievements. Situated on the highest and greenest part of the city, the edifice faces the Borisov garden and the Sofia Theological Seminary on one hand, while on the other, it is opposite to the Faculty of Chemistry of the University of Sofia. The most innovative achievements of world technology are implemented in the building. Its hyperbolic, archlike form is achieved through the natural stone ventilated façade and the “double-skin” system, which contributes to the excellent acoustic and thermal insulation. During the summer there is a natural ventilation provided through atmospheric circulation, when the upper and lower ventilation grids are opened, while during the winter they are shut, which creates an isolating layer of air. The front facade is from transparent serigraphed glass, depicting the oldest Bulgarian decorative ornament - the elbetica - embodiment of the Bulgarian power, traditions and the spirit of the Bulgarian Renaissance. The contrast between the dense stone elements and the glass benefits for the grand appearance of the edifice. The building is unique not only for its exceptional emblematic design, but also for its functionality and portliness of the inner spaces, especially for the grand double-height entrance lobby. In the heart of the edifice there is a green atrium that introduces natural sunlight through the roof, thus creating comfort for all residents.