Building economy: refers to an economic form that takes commercial, commercial, and commercial buildings as the carrier. It develops, rents outbuildings, attracts investment, and introduces various types of enterprises to develop tax sources and drive regional economic development. Which of the following phenomena belong to the building economy:. ['A city government plans to build Binhu New District, and a large number of high-rise residences stand up.', 'In order to save construction land, a county government will demolish all the bungalows in the compound and build several multi-story office buildings.', "The real estate company's newly developed real estate, the houses along the street are commercial and residential buildings, and the ground floor is used as the operating facade to provide convenient services.", 'A city general chamber of commerce invests in the construction of office buildings. Except for some self-use, they are rented and sold from member companies. The surrounding banks, hotels, and shopping malls are dotted with each other, forming a "new business circle".']