Paul,
I know this wasn’t one of your specific questions, but to clarify, are you saying that 20+ years ago the current or previous Owner of the Lot in question undertook renovations that increased the area of that Lot by 40%, and that as those renovations have not ever been noted on the Strata Plan (Title) or reflected by the Lot’s Unit Entitlement, it’s likely that they were never consented to by the Owners Corporation (O/C) and that the area is still Common Property?
It’s more important to sort out the above in my opinion, but in response to your questions about the storeroom:
1) Except in an emergency Yes, unless the O/C has obtained an Order from an CTTT Adjudicator
2) Yes to both, although as the Owner’s had exclusive use for 20+ years I don’t like your O/C’s chances of now refusing to grant that under a Special By-Law, with Conditions – including one about the O/C’s unrestricted access (to the storeroom).