State-owned enterprises change their property management every few years.

The property management contract can be signed for several years, but it is not mandatory, but generally it should not exceed three years. Because the labor cost of property management is very high and the labor cost rises rapidly, if it is signed for too long, the income will not become a cost and cause losses.

The realty service contract refers to the service contract signed between the realty service enterprise and the owners' committee, which stipulates that the realty service enterprise shall carry out professional maintenance, conservation, management and maintenance of the environmental sanitation and public order in the relevant areas, and the owners shall pay remuneration.