The central portion of house or plot is called  BRAHMSTHANA. Vaastu is based on five elements i.e. Water, Air, Fire, Earth and Space.

The central part of plot  should be kept empty. It is the stomach of Vaastu Purush which resides  in the plot. Major diseases like spine injury, liver infection, stomach related disorders, cancer will occur if we do not keep center part free of weight . No pillars or beam is allowed in center of the plot or house. 

We should strictly follow Vaastu principles to lead a good and healthy life.