In line with the arising needs of the firm which is engaged with international construction projects, a prestigious office building has been required on the land of the firm situated in Istanbul, Etiler, The inclined land has connection to the road at its upper elevation. The entrance of the structure, which is planned as two-storied on the road elevation, has been projected to cover both of these floors. The area reserved for vertical circulation has been encircled with transparent walls, which allows an in-depth look inside the building from the entrance. This intervention has also allowed to provide day light to the lower floors of the structure which has 3 underground floors. In order to address various meeting requirements, areas with different dimension have been reserved to serve this purpose on the floors .