690. Conversion of controlled tenancies to regulated tenancies.

On 28 November 19801 every controlled tenancy2 ceased to be a controlled tenancy and became a regulated tenancy3. The only exception is where the demised premises subject to the controlled tenancy were occupied wholly or in part by the tenant for the purpose or partly for the purpose of a business carried on by him4, in which case from the conversion date the tenancy is treated as a tenancy continuing by virtue of the