This research aims to emphasize the relationship between the two functions of private and public space which can be achieved by applying the concept of a transitional space (threshold) with the integration of public open space in the middle of a mixed-use area. This phenomenon shows that overcoming mental health problems in urban communities with the integration of public open spaces with a perceptual research approach from the study of criteria and visual elements of public space. This research was conducted using quantitative methods with data revealed by explanative analysis. The research instrument used is in the form of a perceptual assessment survey regarding the transition space simulation that has been measured based on the threshold space and public space parameters. The needs for a mixed-use threshold space parameters that can become a new communal space for urban communities requires a design approach that supports the creation of sustainable architectural designs (eco-architecture planning) in terms of social aspects.