The 250th birthday of the architect Friedrich Wilhelm von Erdmannsdorff, one of the most important figures of the Dessau-Wörlitz reformatory, was celebrated 18 May 1986. The reformatory was set up as a program in the small principality of Anhalt-Dessau, in keeping with an advanced art and culture in which architecture and urban and landscape development occupied an outstanding place. A great many buildings by F.W. von Erdmannsdorff, as well as the gardens and landscape parks surrounding them, in which he also played a role, still exist. The permanent preservation of these buildings, which are over 200 years old, the maintenance of and repair works on the historical gardens, parks, and landscape parks, with which they form an artistic and nonphysical unity, are the subject of this report.