Izmir city, which is the focus of the study, has hosted many different historical periods and their cultural outputs from past to present. In the city, the traces of different cultural periods such as civilizations of antiquity, Beyliks, Ottomans and Turkish Republic can be examined at the same time. Due to the developments in the marine trade in 19th century, the physical, economical and social structure of the port city Izmir was improved. The enriched structure of Izmir can still be observed through its historical environment. Within this heritage, the role of religious buildings in terms of urban identity, environmental impact and social belonging have a great importance. Furthermore, the preservation / transformation implementations of these structures reshape the physical and social structure of the city.In this sense, the subject of this study is to examine the environmental and social impact of the transformed non-Muslim religious structures of Izmir. Through the site analyses, the effect of the preservation implementations and the new urban roles of these monumental buildings are to be defined while the continuity of the cultural values and contributions to the urban identity will be questioned. The findings of the research will be evaluated over a set of parameters such as environmental impact, sense of belonging, continuity of the spatial identity and the sufficiency of the new uses.