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This paper discusses the public space of the high-rise office buildings on Teheranno street. Since the 1980s, there has been a rapid growth in the construction of high-rise buildings due to the development of architectural technology and the increase of land price along this street. The ground level of high-rise office building is the buffer space between private and public realm and its roles in urban space becomes considerable. Nine buildings between Samsung and Kangnam subway station were chosen and classified according to their site areas and their relationships to the adjacent streets. Three aspects were primarily analyzed and interpreted. 1) the ratio of the public space and site area, 2) the programs of the ground level, 3) the spatial accessibility and permeability between buildings and streets. The paper reports that the buildings generally meet the legal requirements, yet their functions as public space were limited, and argues the importance of the linkage between urban and architectural design.