It might help if you detailed where you have searched so we don’t go down the same rabbit holes.
But, to mix my metaphors, you may be barking up the wrong tree in any case. The committee member’s son expects to get free parking on common property? Why would you even consider that? I don’t know what the cost of informally renting a car space from another resident in your building might be, but in mine it’s about $60 a week.
So your committee member’s son thinks he is entitled to $3000 worth of free parking and gets snotty when he’s denied it. This is not a good look for him, the committee member or the rest of the committee.
By the way, the by-law forbidding obstruction of common property is all you need to ensure access to the electrical services room. That’s what the by-law is there for.
So dig no more! It’s a distraction. Have a meeting and tell the young (??) man to get real or you will charge him the going rate for all the free parking he’s had.