Real estate development investment is in a certain period of time, real estate development companies, commercial housing construction companies and other real estate development legal entities and affiliated with other legal entities actually engaged in real estate development or business activities of the unit of unified development, including the unified on behalf of the construction, demolition and reconstruction of residential buildings, factories, warehouses, hotels, hotels, resorts, office buildings, office buildings and other housing buildings and supporting service facilities, land development The amount of completed investment in projects (such as roads, water supply, drainage, power supply, heating, communications, site formation and other infrastructure projects); does not include the amount of completed land transaction activities alone.