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I'd just blame chance for leaving you with a bigger building and call it done. This easily gets out of hand - and can only be done on a larger scale, but it's still too complicated in my opinion. Otherwise, you'll end up over-complicating things to a point of "Jeez why did I do this in the first place." Why? Because all ages have different sizes for their great buildings - so now tell me what the ratio should be between a trade of 3x3 BA goods building and a 3x4 IA goods building, and then a 4x4 BA goods buildings and a 3x4 IA goods building, a 3x3 BA with a 3x3 IA, a 4x4 BA with a 3x3 IA, etc.
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That's your opinion at which rate you want to set up trades, but in my view a BA trade is a BA trade. But, back on track - so it was that you got a good that required more space. What I've always loved about Forge of Empires is that there's no "finite win" or good, almost all actions you take have a random outcome so you're only in advantage if you do many of those actions. So is obtaining Blue Prints, so are many quest rewards, etc. You get bonus for 2 out of the 5 goods per age, but the selection is random.
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