Condo association wants secret ballots for annual elections

Seeking best method for owners to send in or drop off secret ballots at Annual Meeting.  Also, we wish to have these tallied by an outside impartial agent. Each ballot has a different "weight," depending on the square footage of the owner's unit, so the tally is somewhat complicated. At a recent Annual Meeting, an owner was nominated and "elected" from the floor by those attending. He served on the Board without challenge,although this appears highly illegal. Thanks for your help.