How to calculate the formula of property management?

Are you a designer or a developer? If you are a designer, I can tell you the details. Property includes office space, cleaning lounge, security lounge, maintenance duty room and warehouse. Security dormitory rooms, as well as owners' committee rooms and owners' activity rooms. The specific area is specified in the Property Regulations of Shandong Province, and shall not be less than 150 square meters. The proportion can be three thousandths to five thousandths of the total construction area. I don't usually tell unscrupulous developers.