How to divide urban commercial housing before and after?

Your question is very interesting. I guess you mean the direction of the house. If it is a single-family rural house or city villa, the gate must be in front of the house. China has been this kind of house since ancient times, and many geomantic omen are based on the orientation of this kind of house. However, the vast majority of urban commercial housing are apartments, and the doors are small doors. Generally speaking, the south of Chaoyang refers to the orientation of the living room and balcony, while the orientation of the door is often the opposite.