Please use some logic and check your figures before posting or you will just make yourself look stupid;
70 GSM A4 sheet measures 210mm x 297mm x 0.08mm = 4,990mm3
1 cubic meter measures 1000mm x 1000mm x 1000mm = 1000,000,000mm3
Therefore 200,401 sheets of A4 make 1 cubic meter
Therefore 50,000,000 A4 sheets approx' 250 cubic meters, in other words 10m x 10m x 2.5m, roughly the size of an average condo.
Empire State building has a volume of 37 billion cubic feet, approx' 1 million cubic meters, or 200 trillion sheets of A4