I am confused...Please advice I have read many books saying the front of the building should be base on a)the facing direction of the BUILDING(Like Htl Lisboa in Macau written in books by Raymond Lo)rather than the main door drection, else all Flying star base on that building are not conclusive; (b)Some say base on the DOOR that is most frequently-used; (C) Some say based on the entrance of which the MOST YANG energies enters the house; (d)And you mentioned measure the door form centre of a rectangular house. Which is more authentic, or is it up to us to decide which one we felt more confortable? If is a condomanium, then main door is base on the building? or the main door of the house apartment. Thank You very much!! Rgds, Marcus