The masonry and wall building for the reconstruction of the historic facades for the rebuilding of the Berlin Palace as the Humboldt Forum represent a unique challenge for the art of masonry, structural design and detailed design. In front of the modern reinforced concrete structure of the new palace building, the massive solid brick masonry wall, separated from it by mineral insulation, leads to an overall thickness for the historically reconstructed external wall that comes near to the average thickness of the baroque palace walls. The exceptional thickness of the brick wall serves as a substrate for the facade decoration elements of sandstone and together with the internal insulation, enables the requirements of the energy-saving regulations (EnEV) to be clearly exceeded.