First-line real estate enterprises refer to the economic organizations that rank first among real estate enterprises, engage in real estate development, operation, management and service activities, operate independently and independently account for profits. Real estate refers to land, buildings, inseparable parts fixed on land and buildings and various rights and interests attached to them.

Real estate is also called real estate in economics because of its own characteristics, that is, the fixed position and immovability. There can be three forms of existence: the integration of land, buildings and houses. In the auction of real estate, the auction target can also exist in three forms, namely, land (or land use right), material entities and their rights and interests in the state of integration of buildings and premises.

With the development of personal property ownership, real estate has become the main component of commercial transactions. Buying real estate is an important investment method.

In the process of real estate development enterprises engaging in business activities, that is, land requisition, demolition, land development, land transfer, housing development, housing sale, leasing, subletting, real estate mortgage and real estate construction, a large number of services such as negotiation, coordination, planning and corresponding legal affairs will inevitably arise, which are the main contents of real estate development enterprises' business activities.

For real estate intermediary services and property management enterprises, their service characteristics are more obvious. Real estate intermediary enterprises are a series of consulting, planning, agency and service activities around real estate products, communicating all kinds of information related to real estate products, matching buyers and sellers, saving transaction costs of all parties to the transaction and obtaining commissions from the saved costs.

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