One of the areas of activity that is considered in the municipalities of the country, especially in the metropolises, is the acquisition of property, which is handed over to the municipalities in order to realize a detailed plan, a comprehensive urban plan and a plan to improve and renovate worn-out structures. Be. Therefore, annually, in order to develop the city, the municipalities construct or improve roads and construct recreational and cultural places. The purpose of this study is the legal pathology of property acquisition in a dilapidated area of ​​historical value by the municipality of Sari. The present study, in terms of descriptive-analytical nature, is an applied-developmental research based on survey and field methods. The method of collecting the required data for the research was based on the library method, documentary method and field survey method (with a questionnaire) with a sample size of 384 citizens of Sari. Chi-square statistical analysis in SPSS software was used to analyze the data in the present study. The results show that the most important internal damage of the municipality in the acquisition of property located in the dilapidated areas of Sari, respectively, including poor information of laws and legal mechanisms, lack of coordinated executive procedures, lack of continuous tariff updates. The price of real estate is the lack of timely implementation of plans and plans and the lack of legal studies in the preparation of plans. Therefore, Sari Municipality should increase the strengths and reduce the weaknesses and create structural and functional cohesion and internal integration in the ownership of the properties located in the project, rather than inter-sectoral (inter-organizational) and extra-sectoral (extra-organizational) extraversion. To organize the worn-out tissues of Sari city.