The architectural ensemble covered by this study is located within a section of Branilaca Sarajeva and Kulovića streets, continues along the central part of the Miljacka riverbed along Obala Kulina bana, Jadranska street and along the outer wall of the District Prison, connecting with the starting point in Branilaca Sarajeva street. The site of the Kalin hadži Alija mosque, which is the subject of special archaeological research, is also located in this ensemble. The analysis of known traces and signposts that indicate the emergence and formation of part of an architectural ensemble from its inception to the modern era, covered by the study on the protection of cultural, historical and natural heritage, is the result of research into the architectural, urban and ambient characteristics of the given space. The study on the protection of cultural, historical and natural heritage can eliminate erroneous interventions in the space in future planning. The study is a starting point, which provides the possibility of transforming existing physical structures into a more pleasant and natural living environment, and in this sense is the basis for the development of the Urban Planning Project "Post Office-Court".