This section applies where a landlord assigns the reversion in premises of which he is the landlord under a tenancy.
If the landlord assigns the reversion in the whole of the premises of which he is the landlord—
he may apply to be released from the landlord covenants of the tenancy in accordance with section 8; and
if he is so released from all of those covenants, he ceases to be entitled to the benefit of the tenant covenants of the tenancy as from the assignment.
If the landlord assigns the reversion in part only of the premises of which he is the landlord—
he may apply to be so released from the landlord covenants of the tenancy to the extent that they fall to be complied with in relation to that part of those premises; and
if he is, to that extent, so released from all of those covenants, then as from the assignment he ceases to be entitled to the benefit of the tenant covenants only to the extent that they fall to be complied with in relation to that part of those premises.
This section applies as mentioned in subsection (1) whether or not the landlord is landlord of the whole of the premises comprised in the tenancy.