[QUOTE=g346007_1906957;62991]Pattern for the contributions?

To level 10: 3,920,400 = 1980^2

To level 9: 2,560,000 = 1600^2

To level 8: 1,587,600 = 1260^2

To level 7: ? (could someone fill this in?)

Going through forum under one of the guild hall benefit sections, found a place where Borocast said Guild Hall level 7 cost 912k. Hope this helps!