Interior Space and Exhibition Design Symbol Istanbul Sales Office by Yelin Evcen & Gönül Ardal Sales Office of a residential building project is the first address that a firm meets its clients. The balance between functionality and style while reflecting the architectural values was the primary aim of the design. The use of color, geometrical shapes and fractions was designers’ main design tool which allowed them to play with shapes and levels to emphasize the functions. Gonye Proje combined different materials and adopted a contemporary approach to create a unique space that reflects the characteristics of the whole project.