Sub-leasing on a fixed term tenancy agreement

Shelley Turner asks:
(updated on Wednesday, November 22nd 2006)

Hi. This question pertains to a fixed term tenancy agreement. The property has an annexe (referred to as "the storage unit")that can be sublet. It was sublet for residential use, however, this was contested on the basis that the annexe was only to be sublet for "storage" purposes. Does this mean any sublease of the "storage unit" would be considered a "commercial lease" agreement and thus not subject to the Residential Tenancy Act? Thanks.