A lease (A) is of commercial premises if none of the demised premises is—
let under lease A as a dwelling,
let under an inferior lease (B) as a dwelling, or
occupied as a dwelling.
The "demised premises" in this section include anything on them.
"Let as a dwelling" means let on terms permitting only occupation as a dwelling or other use combined with occupation as a dwelling.
Premises are not within subsection (1)(b) if letting them as a dwelling is a breach of a lease superior to lease B.
Premises are not within subsection (1)(c) if occupying them as a dwelling is a breach of lease A or a lease superior to lease A.
This section applies for the purposes of this Chapter.