The existing urban agglomeration and architectural construction fund of the Old Core of Zemun[4] are in themselves sources for the particular study and research on the development of methods of organizing and formation of the settlement, the construction of the object, the use of construction materials, municipal development, styles of buildings, functional, targeted and content features of architecture and spatial organization of life in general. Architectural heritage[5] by which we mean the total physical fundus of spatial achievements, is also a source for the study of social differentiation and infrastructure of certain periods of growth, social possibilities, regional, ethnic and religious specificities, the taste of the epoch, and many other forms of life. The studies can be carried out by analyzing the material remains or continents created and saved for most of the early 18th century to today. Many buildings were preserved in their original condition, especially from the second half of the 19th century (like the Spirta House from 1855), while a smaller number of buildings from the earliest period, from the period of the first decades of the 18th century, when Zemun became part of the Austrian Empire, was only partially preserved in its original state. Chronology of the formation can also be partly determined by analyzes of the buildings, based on existing records on them, the material used and the method of construction, type and style analysis. Oral traditions of residents whose families inhabit the existing buildings from generation to generation, preserved items and inventory in houses expand the sources of tests. On the whole, the Old Core of Zemun is a basic, real source, particularly for architectural and artistic-historical research methods.