I was under the impression that “exclusive use” meant that it was Body Corporate owned and the lot owner was grant exclusive access and use? An example would be a courtyard accessed from the lot but unable to be accessed from elsewhere. It doesn’t form part of the lot holding but is only accessed and used by the one lot owner. This may be in perpetuity (generally carparks unless they actually have their own lot number and can be sold separately), or it may be granted as part of a by-law that is reviewable. Whilst owned by the Body Corporate this doesn’t allow the owner to do anything they want and they still need to comply with any relevant provisions.