A complete sublease is a warning sign in an apartment building, but it is not by itself proof of a sham sublease. Section 2(3) MRG gives the subtenant a specific route to seek recognition as the main tenant where the circumstances leave no reasonable doubt that the main lease was concluded only for subletting and for circumventing the statutory rights of a main tenant.
The decisive issue for owners, buyers and residents is documentation. The review covers the original main lease, actual use, the relationship between the contracting parties and the person who carries the economic risk of the tenancy. A later label saying “sublease” does not replace that review.