The intensive changes in the last century have affected the way people cope with their environment. There was a rising of ephemeral social contacts in this process of social life segmentation and increased heterogeneity. In spite of that, local sociability is still considered an important mechanism of social integration and of coping with diversity. Place identity and use of the neighborhood are understood as influencing on the social interaction in a community, nonetheless, evidence has not been provided so far to suggest which variables most affect social interaction between different socioeconomic groups living in the same urban environment. According to literature, aspects such as socioeconomic status and ethnic background help to explain use on urban places, and many authors (e.g. Rapoport, 1978) corroborate that perception of similarities can affect territorial behavior, influencing the social interaction in a place. Territorial behavior helps to organize social life in terms of who, what, how and where any activity can be done, also informing the levels of privacy and territorial control regulating a place. On one hand, it is related to the definition of physical and symbolic boundaries that promotes the emergence of social image, and place identity. On the other, those barriers defines the level of access into a place, allowing to identify who is or not part of the place, regulating the social contact. Concerning those mechanisms, this paper empirically addresses the effects of spatial attributes mainly relate to the territorial behavior. It discusses how those practices can be arranged when different socioeconomic groups are living in the same local neighborhood, especially in terms of how they can regulate the interaction between them and the establishment of a social image. The research consists on a comparative study of three central areas in the city of Porto Alegre, South of Brazil. In these areas, characterized by high and medium income population, low-income groups were introduced through social housing re-urbanization projects. Physical and compositional attributes related to the interactional process were investigated through the different levels of social interaction evaluated by residents’ attitudes and spatial behavior occurring in the local environment, regarding the type and intensity of simultaneous activities going on and/or the desire of separation between groups. Data collection consisted of physical survey, interviews, questionnaires, mental and behavioral maps, while data analysis was based on non-parametric statistic, GIS resources, syntactic analysis and graphic of visibility analysis. Results show that the possibility of identifying a common image, defined on the basis of territorial behavior, hence perception of homogeneity in the neighborhood, satisfaction with residential place and relationships between neighbors, contributing to promote social interaction between different socioeconomic groups. Furthermore, for one of the studied areas, it was confirmed that differences in territorial behavior increase the perception of diversity among residents and also the desire to avoid contact in neighborhood public spaces, which implies less potential for social interaction among the different groups. The findings enable better understanding of social interaction between different socioeconomic groups living in the same neighborhood. It is expected that it can stimulate discussion on the issues of diversity, identity and its effects on social interaction, in order to implement congruent urban policies.