Abstract
Throughout history, historical architectural works have been maintained, changed in use, expanded spatially, and had architectural elements added. These interventions and additions contribute to the dynamic nature of a structure. However, dealing with these additions, whether through familiarization, complementary conservation, or occupation of the constituent elements, can be a complex process. Proper actions in conservation, stabilization or destruction require an understanding of the reasons behind the existence of each layer, which could provide the basis for essential actions. This research aims to examine the formation of historical layers over time. It seeks to address questions such as the role of historical layers in conservation decisions and the process of a building’s evolution. This study is classified as applied and developmental research, utilizing a combination of strategies and research methods. It will be a qualitative research study based on a case study approach, utilizing archival documents, fieldwork, and library resources, and documentary data collection. The study will place a particular emphasis on conducting field observations. The Pir Bakran building has been chosen as an important architectural feature to illustrate the path towards understanding buildings with multiple historical layers. It heavily relies on the research method based on case samples and data analysis. Ultimately, this research emphasizes the importance of a comprehensive understanding of historical structures and their different aspects throughout the conservation process. This includes accurate knowledge of the work’s existence, nature, and the recognition of all historical layers and the reasons behind their creation as the work has developed and evolved over time. Such understanding forms the foundation for effective and proper conservation.
Keywords: Architectural Extensions, Historical Layers, Evidence- Based Restoration, Pir Bakran Mansion.

Introduction
The 11th article of the Venice charter suggests that the valid contributions of all periods to the building of a monument must be respected, since unity of style is not the aim of a restoration. When a building includes the superimposed work of different periods, the revealing of the underlying state can only be justified in exceptional circumstances and when what is removed is of little interest and the material which is brought to light is of great historical, archaeological or aesthetic value, and its state of preservation good enough to justify the action. Evaluation of the importance of the elements involved and the decision as to what may be destroyed cannot rest solely on the individual in charge of the work. So, it would appear that the exceptions allow for intervention in the structure and the removal of layers, especially extensions. But there is a question: what feature of that particular layer enables intervention?
However, many theorists argue that the presence of historical layers within a structure affects its authenticity, particularly in light of the fact that material integrity is taken into account when determining the historical accuracy of a work The Nara document (1994) of course, this issue is related to various perceptions and the gradual emergence of the notion of authenticity. The Nara document (ICOMOS, 1994) brought up a never-before-discussed issue: the varying perspectives on authenticity across different cultures. Effective conservation calls for the accurate reading of historical layers in valuable buildings and an understanding of the factors that led to the formation of additional layers in various eras. The research’s central premise is that historical layers are intentionally created over time.  
The hypothesis of this research is “creation of historical layers over time is purposeful”. The research questions include: What role do historical layers play in historical decision-making? How does the process of building evolution occur? What are the reasons for the formation of historical layers in a building? Will be. The historical monument of Pir Bakran was the subject of a case study that was looked into in order to comprehensively and deeply clarify the topic, content and understanding of the phenomenon within the context. Due to this monument’s historical feature, varied uses throughout its history, and multiple significant historical layers with various causes for formation, it has received discussion that hasn’t been done before. It will be a qualitative research based on a case study approach, utilizing archive documents, fieldwork, and library and documentary data collection, with a particular emphasis on field observations. The so-called process that should be followed in order to understand the building with different historical layers is indicated by an examination of the case study’s outputs.

Identified Traces
Over time, conservation theories from the 20th century have revealed the various facets of authenticity. These studies have demonstrated that throughout its history, authenticity has been a variable and relative concept. Theoretically, the approach to the idea of authenticity in charters and documents has significant implications for conservation and interventions, particularly when choices are made regarding the conservation or removal of historical layers. It has been looked over and read again to come to a conclusion about the historical layers. The emphasis was laid on the necessity to respect and maintain the authenticity of historic monuments as well as to safeguard them an appropriate use “no less as works of art then as historical evidence”. These aspects, in fact. From the essence of the theories of conservation, the questions around which debates had been going on for more than a century, and where opinions had often been divided (Jokilehto, 2005: 422).
Because the building’s historical eras reveal the history of the monument and provide tangible and intangible proof of the decisions made during its lifespan, entire portions of the evidence should be preserved. Conservation of historical evidence is crucial because loss shouldn’t happen as a result of preservation since a monument’s history can be viewed as a component of its value. The responsibility for safeguarding the historical layer, which implies the building’s life, survival, and durability, rests with the decision-makers. Buildings’ historical layers all work together to create a cohesive whole and give it consistency. In fact, every layer is a historical record of its time and shouldn’t be altered, moved, or removed during the intervention. The originality of a building’s overall design is also reflected in the originality of the building’s component parts or historical layers.

Conclusion 
Based on the research, which included details and changes identified in the Pir Bakran tomb’s architectural elements of and specific categories, determining the exact date of extension and added decorations with using inscriptions, old photographs, archaeological findings and architectural evidence, it determines that the Pir Bakran tomb has different and numerous historical periods, which makes it particularly complicated. This building’s construction began with a small adobe room, which was later joined by a lofty three-story structure, and due to political, religious and geological developments, decorative and structural elements with different periods are added to it. Some of the extensions were created while completing the Pir Bakran tomb and related to the construction period of the building. The expansion and additional elements of these periods, such as the additional belt, the southeast entrance, etc. shows the structural and decorative evolution of the building. In fact, a historical monument is the result of the combination of various historical layers that have formed over time and blended together. These layers have experienced ups and downs and, at times, have become intertwined, ultimately reaching us in their present state. Therefore, the removal and cleaning of these extensions would be against preservation principles. It has actually been necessary to conserve some of the Pir Bakran building’s historical layers, so it would seem necessary to maintain the structure’s integrity.