SAM just to clarify – as Jimmy said, the first hurdle for any grant of Exclusive Use is for ≥75% of Owners present either personally or by proxy at a General Meeting of the Owners Corporation to vote in favour, and where that percentage has to be calculated from the cumulative unit entitlements of those Owners / the aggregate unit entitlement for your Plan.
So actually, the answer to your question is NO, neither the Executive Committee nor the Strata Manager can grant permission for exclusive use.