What exactly makes a smart building "smart"? How can the privacy of users be protected? What are the future trends in the building market? During the 2023 Financial Street Forum, CGTN reporter Cui Yingjie conducted an exclusive interview with Zhang Mingjie, former chairman of the International Facility Management Association (IFMA) Beijing Chapter, to discuss the trending topic of "smart buildings." In the interview, Zhang introduced the sustainability and digitization of buildings in the new era, and also introduced a new model in the smart building industry called DEPCO (Digitalization, Engineering, Procurement, Construction, Operation).