(1) In this Part,—
boarding house tenancy has the same meaning as in section 66B of the principal Act
existing tenancy, in relation to a provision of the principal Act amended, substituted, or inserted by this Act, means a tenancy (including a boarding house tenancy) that—
(a) was granted before the commencement of the provision of this Act that made the amendment, substitution, or insertion; and
(b) subsisted immediately before that commencement.
(2) A provision of the principal Act as amended, substituted, or inserted by this Act, so far as it is applicable to any tenancy, applies to the tenancy even if the tenancy is an existing tenancy.