You need to separate the concepts of ownership and responsibility for maintenance.
The OC owns common property until such times as it sells or transfers ownership to another person or company.
In terms of tiles on floors this SCA publication, Who’s Responsible, is very helpful, but basically it says tiles on the floor and external walls are the responsibility of owners.
Exclusive use by-laws allow individual lot owners to enjoy exclusive use of parts of common property but, to be legally valid, they must have a clause saying who is responsible for maintenance of the common property for which exclusive use has been allowed.
The default position is that the OC is responsible unless the benefitting lot owner is named as being responsible in the by-law.
However, the intent of the law is for people taking over common property to take over responsibility for its maintenance but for the OC to retain responsibility if they are daft enough not to insist that is part of the by-law. That way, responsibility is always clear (if not entirely fair).
All of the above is why exclusive use agreements made on a nod and a wink should never be entertained. Sales of properties and changes of EC and OC membership leave both parties wide open to disputes that cost time, energy and money and are totally unnecessary.
On the question of lawyers disagreeing, there are lawyers who work in strata, others who live in strata and a third group who’ve heard about strata. All of them think they are experts but only one group is likely to give you the right answer … provided you ask the right question.
The opinions offered in these Forum posts and replies are not intended to be taken as legal advice. Readers with serious issues should consult experienced strata lawyers.