Urbanization and development of cities is necessary in contemporary society, however, these advancements are also causing urban problems, such as lack of open green space, density problems, traffic problems, and over population. Also, existing buildings are often lacking certain functions that are currently needed since they have been designed in the past. Thus, plaza and mixed used buildings, which are considered as a unit space, are needed to mention for 'publicity' that is a part of urban components as a wide spatial concept. In particular, mixed used buildings as multiply functioned facilities are needed a specific study for 'publicity' and 'urban plaza'. Thus, the objective of this study is to reconsider the concept 'publicity' in cities as a strategic space in order to vitalize the city. The study includes analyzing connectivity between urban plaza and architectural space and proposing design methods for a mixed use building which will improve interaction between urban context and the buildings.