Píč's estate in Bohemian Paradise

When we were walking along the Golden Path of the Bohemian Paradise, at the turn to Klamorna, we were attracted by the Stone Gate with the ruins of the remaining house next to it. Curiosity made us explore the place closer. It turned out that there are more demolished buildings here. The question arose as to which former complex it actually is. We immediately ruled out the ruins of a castle or fortress, just based on the sandstone blocks, floor plans of the buildings, entrances, windows...