Due diligence preventing leaks between condos
I am not sure how technical your board members are but I think an easy thing to do is waterproof the entire bathroom.  I feel like I am giving you some Holmes advice (totally overdoing something) but you can lay a Kerdi membrane over the entire floor and up 4-6 inches on the wall and of course your whole shower area.  You could virtually take a bath in your entire bathroom if this was installed correctly without a leak.  

Now as Henry pointed out the plumbing can leak almost anywhere.  So maybe they want all of the plumbing along a wall or two.  If these are the things they want (I wouldn't bring it up) then you could configure your layout plus the waterproofing to hopefully meet their standards.  If your association is like most then it is probably more of how you get along with everyone vs. what you are looking to do.