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Not just a square.  I have 6 Investment Banks (+10% in a 2 radius) next to 6 Level 10 Game Studios (+10% in a 5 radius), and pretty much space out +% coin buildings strategically throughout my map to stack bonuses. 

My map is 15x10 blocks (a block is 4x4 spaces) if that helps.  Yes, I was a little nutty on land purchases for a while.