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There is no specific provision that deals with this specifically.
But essentially you could easily argue that the board members owe all the owners a fiduciary duty and a duty of care.
Part of their duty certainly extends to treating all owners fairly and equally and they most assuredly cannot treat themselves better or benefit from their position.
I would say that in your case they seem to have been deceptive and dishonest if what you are alleging is true in terms of the trying to keep the size private.