AoA Members, 
 
	I am trying to check the building stability against overturning.
 
	The building consist of 6 story commercial floors(having dimensions  as 198ft x 169ft)  and a tower consisting of 21story(having dimensions of 152ft x124ft) . The raft under the tower is 72" and 48" under adjacent commercial floors.  
 
	I have few queries regarding calculating overturning moment and resisting moment.
 
	1) Will the overturning moment be  base shear x Total tower height or  summation of (story shear of individual story x Elevation of each story from base). 
 
	2) How the resisting moment will be calculated?