The in-situ examination of the historical enclosure wall of the Star Game Preserve located in the capital of the Czech Republic, Prague, is presented in the paper, in order to obtain necessary information for a qualified design of renovation and reconstruction treatments. At the visual inspection of the researched structure, the previous reconstruction methods are identified and evaluated, together with possible moisture sources. Moreover, the damage extent and propagation are assessed. Most of the oldest as well as newly constructed parts of the enclosure wall are found in bad condition and dilapidating. On this account, the building stone (arenaceous marl) forming the original historical masonry is examined to find compatible materials for the reconstruction works. Its chemical composition is accessed by X-Ray Fluorescence analysis. For the researched stone, basic physical, mechanical, hygric and thermal properties are measured. Using the obtained data, the proper material for reconstruction purposes will be identified.