In 1769, the manor became the property of the Duke of Courland Ernst Johann von Biron. Then the first known description of the manor inventory was compiled. The house was made of covered logs and covered with a thatched roof. On the left from the spacious hallway, which had a double door, was located one large room with two side and two end chambers. In the room and in one of the end chambers there were black glazed tiled stoves, the rest were made of unglazed tiles. On the right side, there was an entrance to the opposite room, which had two side chambers leaning next to it. There was only a simple tile stove and a bread oven. The partitions were covered with clay and whitewashed, the floors and ceilings were made of boards. The building had a total of ten windows.

This description shows an extremely simple building, in which it is difficult to imagine the dwelling of the nobles. In addition, the frequent changes of owners and their aristocratic surnames show that Pamūša was really valued as an economic farm where none of them intended to live there permanently. The other buildings were also made of logs – a granary, a square-sealed stockyard, a servant's dwelling house, a threshing barn and three other barns.