CW50-HL (Horizontal Lining) structural curtain wall system applied in the building and it demonstrates horizontal lines and minimizes the vertical gasket effects. The k value of the system is less than 2.26 W/m2K and DIN 4108 cladding material gruop is class 2.1. The glass with a thickness from 6mm to 40mm can be assembled. Technical solutions where developed for vertical and horizontal dilatations. Optimum water discharge was obtained by means of compartmenting and zoning methods. Water and air resistance up to 600 Pa was obtained. In the side at the horizontal band system, water isolation membrane between the cladding and the composite panel connection points was made by bundling. The total composite panel area of the building was 2000 m2 and blue reflective glass with 36% inner reflection was used. Hidden wings that can be opened by resisting stainless steel accessories were opened and natural ventilation was obtained.