In 1907, the UK passed the National Trust Act, providing a legal basis for a building or a tract of land to be placed under a permanent trust, such that even the government can't develop over it.
1907 年英國通過《國民信託法》，賦予法源依據，一個地區或一棟建築一旦被買下並指定為永久信託，連政府都不能開發。