I live at 'The View' in Edmonton (it's 5 floors, and made out of wood) and when my wife and I bought the place, we did a little research into this.  It turns out that someone in their last building had a 250 fresh water tank in their place and it was fine.  Another person had a full sized grand piano (those are heavy, and only have 4 legs).  The ammount of weight doesn't seem to be an issue, but rather where you put it.  If it is by a load beagin wall, you could any sized tank and it would be fine.  The larger the tank, the larger the foot print, and thus, the lower the PSI! 
		
	
		
		
		
		
			
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Have a good one!
			 
		
		
		
		
	
		
		
	
	
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