Strong building interaction with the public space has a great role in shaping social activities such rnas sitting, walking and standing. Especially on the ground floor the space created inside the rnbuilding must interact with the public space (Camilo Sitte). This study aims to understand the rnstrong spatial interaction of the public space at the plinth ground and lower level which has a rngreat role in shaping social activities such as sitting, walking and standing and many more. The rnstudy is expected to provide the future building of Addis Ababa, which may encourage rnawareness among local developers and communities to do more in designing and enhancing the rninteraction at the ground plinth. On the other hand, the study also opened for further rninvestigations. Spatial interaction at building plinth should be investigated and propose a design rnthat can enhance the plinth on mixed use buildings through incorporating accessible ground floor rnspaces, well function space flow from private space to public space of the building, open public rnspace, walking spaces, staying spaces with friendly activities for encouraging social interactions.rnCase study buildings are selected based on exposure of the building in conjunction with the rnadjacent street and street should be > 25meters and between 15- 25meters. Here, the study rnfocuses only on the ground floor that is analyzed based on characters that are identified to rninfluence the spatial interaction. In order to get a deeper understanding of what is happening;rncase study method is used in this research as a methodology. Different data collection techniques rnsuch as interview, site observation and mapping are used. Observation, documentations and rndrawing are summarized and interpreted through maps and tables. Finally, the analyzed data are rnpresented with tables and pictures obtained during field study.rnThe study findings indicate that the existing spatial interactions at building plinth of the mixed rnuse buildings of Addis Ababa faces lack of accessible ground floor spaces, well function space rnflow from private space to public space of the building, open public space, walking spaces, rnstaying spaces with friendly activities for encouraging social interactions. In response to those rnfindings, this study confirms the importance of ground floor, as a pedestrian in the city, feel rncomfortable, safe, and captivated by the details of what your eyes see. The design attitude of the rnarchitect is important to start designing from the street, not from the building. Need to design rngood and pleasant entrances and ground floors. Different functions should be included with in rnthe ground floor. Flow space should describe the space that is produced from the flows of people, rninformation and goods, rather than concentrating on the boundaries. Physical access should not rnbe limited to entrance spaces. Visual connection with the surrounding should be considered.