South-west corner is said to be most powerful and stable corner which according to Vastu should not be left unoccupied. This corner is being suggested for the placement of master bedroom and in office premise CEO's chamber. This area also happens to the region of firm relationship and bonding, therefore Vastu advices not to leave this portion empty. Anything including painting, artifact or light should be placed here if no room is built in South-west.
For strong relationships South-west part should be occupied by owner of house.