Valid point from Sir Humphrey. But you should check the exclusive use by-law wording, as there might be a prohibition there. The exclusive use would have been recorded as a by-law so obtain a copy of your building’s by-laws and see how they are drafted. But strata law is leery of preventing any restriction on preventing commercial letting and restricting access to lot property. Efforts by Owners Corporations to prevent short-term renters from accessing Units, or car spaces has been ruled invalid when legally challenged, and this is a similar situation.
If your by-law does seem to have a restriction as you were told, then the building’s owners can amend it. You don’t need a lawyer to be involved – you can come up with revised wording, and the owners corporation only needs to pay the registration fee, (and your strata managers time for attending to the recordal), which isn’t much. It sound like you have majority support.