Abstract: The subject of the research is the approach to the preservation of the Yusupov Palace on the embankment of the Moika River, house 94, St. Petersburg. The object of the study is the repair and restoration measures in the private quarters of the princess: the princess's office, dressing room, bathroom, Persian. The purpose of the study is to "replenish the knowledge base" of specialists in the field of conservation, promotion and protection of cultural heritage sites. Along with the palace objects of the Northern capital, the ensemble of the Yusupov Palace is the embodiment of the culture of its time, expressed in the luxury of life. The monument has a rich historical and architectural history, reflected in numerous books and monographs, however, very little attention has been paid to the disclosure of the experience of repair and restoration work, which is so valuable for studying the monument. The relevance of the study lies in the scientific consideration of repair and restoration work on the subject of an approach to preserving the iconic object of palace architecture. The practical value of this study is aimed at replenishing the "restoration knowledge base" by highlighting the restoration activities carried out in 2020 in the premises of the Palace with six wings, which is part of the cultural heritage site of the federal heritage of the Yusupov Palace. These rooms include the private quarters of the princess: the Princess's Study (Small White Living Room), Dressing Room (Porcelain Boudoir), Bathroom, Persian (Eastern Boudoir). Based on the considered materials, an analysis of the state of the premises before restoration and the work performed was carried out. The approach to the preservation of the monument as a whole is outlined.