Monumental structures that achieve continuity through traces from the past to the present should be carefully preserved and handed down to future generations because of their social, cultural, religious, economic, and historical values and symbolic meanings. The monumental buildings of the Seljuk Period, which constitute a significant part of Turkey's rich cultural heritage, are important landmarks that deserve to be preserved for their strong sense of place and context, as determinants of urban perception and urban identity, and as memorials. Although Turkey has an abundant monumental architectural heritage, the issue of preserving these structures with their original values and ensuring their sustainability is not the main topic of conversation often enough. The buildings should be preserved as a whole, together with all the historical layers gained after the additions and repairs.In this study, the restoration processes of Hunat Hatun Mosque, an important structure of Hunat Hatun Complex, which is the first complex in the Seljuk Period in Kayseri, are discussed based on different periods from the Ottoman period to the present. In this context, first, the construction, development and change, and architectural features of the Complex are briefly explained. To evaluate the preservation and repair process of the mosque, a detailed literature review was made, and based on the data obtained, the maintenance and repair works of the building were noted chronologically. The understanding of preservation in Turkey regarding the repair and restoration of monumental structures, as well as the preservation activities are discussed, and the effect of important developments in the field of preservation on the change and transformation of Hunat Hatun Mosque is determined. In the conclusion section, which can be considered research on the history of restoration, the originality value of the building after the preservation, restoration practices and interventions is questioned. This study discussing a conservation approach to be implemented for similar cultural assets is expected to be a guide for further studies.