For example, in Chinese real estate law there is no unified concept of real property; the state owns all land but often not the structures that sit on that land. A rather complex ad hoc system of use rights to land property has developed, and these use rights are the things being officially traded (rather than the property itself). In some cases (for example in the case of urban residential property), the system results in something that resembles real property transactions in other legal systems.[citation needed]