Commercial housing has a main entrance balcony and another door. Why is Feng Shui bad? The original main entrance faces west, and now I want to open another door facing the Nanyang Terrace and widen it into a small courtyard.

The original main entrance faces west, that is, sitting east to west. The house is the earthquake palace (one of the eight diagrams palaces) and belongs to wood. As long as the angle of the back door is not quite right with the original front door, just a little south of due west, and don't open it north of due west, because both due west and northwest are gold and Jin Kemu, which is not good for houses.