Brownsea Island by third parties, is owned by the National Trust. Most of the buildings are situated near the small landing stage. The northern portion of the island is a Nature Reserve managed by Dorset Wildlife Trust and an important habitat for birds; this part of the island has limited public access. A small portion to the southeast of the island, along with Brownsea Castle, is leased to the John Lewis Partnership for use as a holiday hotel for staff, and is not open to the public. The island forms part of the Studland civil parish in the Purbeck local government district.
Brownsea Castle of the 20th century, using it to house his collection of antique musical instruments. Brownsea Castle was purchased by Mary Bonham-Christie in 1927. She allowed the property to fall into disrepair and by the time of her death in 1961 it was in a very poor condition. It was then purchased by the National Trust and leased to the John Lewis Partnership, who restored it over many years. In the 21st century it is still used by the Partnership as a corporate hotel for their employees and retired staff. Brownsea Castle was built as a consequence of international tensions between