In 1897, Arthur von Thümen had to sell the Blankensee estate with the Schönhagen and Stangenhagen estates, including 11,000 acres of forest, fields and meadows, to the German settlement bank for 2.25 million marks. Part of the district went to the publisher Rudolf Mosse. He acquired the Schönhagen estate and Stangenhagen for around one million marks and had a mansion built in the early 1900s based on plans by the architect Ernst Lessing. The exact date of construction is not known. The Brandenburg State Office for the Preservation of Monuments and the Archaeological State Museum (BLDAM) states “1902/1910” in its monument database. Hiltrud and Carsten Preuß express themselves more cautiously and give the date "probably around 1910". Mosse was expropriated during the National Socialist period. After the end of the Second World War, the community used the villa first as a kindergarten, later as a district school for further training of school officials and from 1978 to accommodate families.
After reunification, the castle served the Brandenburg state government as a training center for the Brandenburg social education training center from 1990. It was extensively renovated by the state government and used as a training facility until 1997. Having been re-assigned to the Mosse family heirs, it is up for sale in 2020.