The aim of this study is to contribute to the architectural researches of the early Turkish Republic period. The subject of it is "Türk Hava Kurumu Turkish Air Foundation Administration Bui lding", constructed in 1934. I t has been in the shade between the some other advance guard modern architectural works of the period, so far. I t was designed by Ernst A. Egli, one of the foreign architects invited to Turkey to modernize architecture and its professional education. In this study the building is examined and evaluated in details, with its architectural design and relationship to the social, economical and cultural context which helped to shape it. The total plan of the building consists of three main parts fo r three main functions: Administration", "offices", "stairs and service area like toilets etc. ". These parts were shaped as three different masses in different geometrical forms and orientations with pure facades. Both massive brick and reinforced concrete skeletal frames were utilized in their constructions. Regional datum, economical, industrial and technological conditions of the country were, on a large scale, respected in designing. Refering to the principles of the Bauhaus School of the 1920's, the building reflects the international functional-rational approach which is in conformity with the aims and reforms of the Republic.