Design of the building shell having increased performance to reduce energy expenses.The following design approaches were applied for LEED Platinum Certificate Candidacy: The structural design of the building pushes the boundaries with console block having 22 m width and reaching a length of 16 m, the composite floors having just 10 cm thickness, and stairs having 6 m console length and manufactured with only plates. The steel elements are left open in order to be identified at interior and the façade of the building is selected as glass façade system in order for steel elements to be spotted from outside. Headquarter is designed with a modern architectural concept featuring the transparency. Conference Hall with 120 Persons Capacity.8.000 m2 Closed Area (Excluding the Car Parks).16.750 m2 Construction Area (700 tons of Steel).The details of the headquarter building are as follows: Therefore, it is decided to design and build a headquarter building as a green building which is LEED PLATINUM CERTIFIED (2nd highest score in Turkey and ranked 31st in the top 100 LEED certified buildings in the World.) PROKON - EKON Group of Companies has decided to gather all the companies under a single roof. Multi - Discipline Engineering Services (Architectural, Structural, Electrical, Mechanical, Infrastructural Engineering Services) PROKON - EKON GROUP New Headquarter Building