Real estate refers to land that is regarded as property under a certain land ownership relationship. Real estate mainly includes land and land capital. Simply put, it is land property with clear ownership relationship in law. Real estate includes the ground and its upper and lower spaces. The fundamental difference between real estate and land lies in the ownership relationship. Land has the characteristics of usefulness, scarcity and effective social demand. Land capital is a development investment that makes the land reach a certain use standard. This investment must be transformed into a certain amount of materialized labor and living labor, and it must have the property of commodity itself. Primary market. This is a market monopolized by the state, which involves the change of collective land ownership and the realization of state-owned land ownership. Business operations include: land requisition and property right transfer procedures; Transferring the land use right for a certain period by way of sale or auction; Lease land and collect land rent regularly. Broadly speaking, commercial real estate usually refers to the real estate forms used for various business purposes such as retail, wholesale, catering, entertainment, fitness and leisure, which are different from ordinary houses, apartments, villas and other real estate forms in business model, function and use. Real estate with office as its main purpose belongs to the category of commercial real estate, and can also be listed separately. The commonly used vocabulary abroad is the concept of retail real estate. Generally refers to the form of real estate used in retail industry, and in a narrow sense, it is commercial real estate.