How does the person in charge of the sales office communicate with the real estate engineering department, marketing department and development department?

Generally speaking, the property department will be at a disadvantage in the project, and will do a lot of work, often thankless. It is suggested that if there is a problem with that piece, contact the department head directly and let the department head issue the task. Because you are not the leader of a department, the employees below may not listen to you. I also have good relations with various departments.