The purpose of this study is to analyze the planning documents for conservation and utilization of historic buildings certified by Yokohama city and to consider the feature of the method of the certification system for historic buildings of Yokohama city. The results are as follows. The documents of 51 buildings in Naka-ward refer 59 places -41 buildings, 7 streets and 10 parks- as the landscape value of buildings. The overall references make 11 groups of buildings, streets and parks. The result of analysis indicates the certification system of Yokohama city tend to conserve the relationships of buildings, streets and park.
