The proposals for a land value tax outlined by Chancellor David Lloyd George in his People's Budget of 1909 prompted the trustees of the Deepdene estate to start to sell the unimproved land on the western side of Box Hill. As a result of negotiations led by Sir Robert Hunter, Leopold Salomons of Norbury Park purchased of Box Hill in 1913 for £16,000. The following year, Salomons donated the land, which included the Old Fort, Swiss Cottage and the western flank of the hill above the River Mole, to the National Trust.