In much of the world's civil law systems is the same as "real property"; it is land or any permanent feature or structure above or below the surface. In some countries, China for example, private ownership of land is not allowed. Individuals in China may obtain land rights for a fixed number of years for a fee. These rights may be transfered by legal means including gift or sale. They may also own houses, buildings or apartments, but not the land they sit on. In the United States immovable property is also known as real estate. In the United Kingdom it is also known as property. 