Effect of neighborhood buildings / rooms
Energy always flows from North to South and from East to West. Having residences on Eastern or Northern sides, such energy would flow causing reduction in adverse effects of vastu defects in ones own building.
Constructions in the NorthEast neighbor's such as building or rooms gives out energy to ones own building. Constructions towards NorthWest & SouthEast also give out energy as well as take from ones own construction.