A retail shop lease may contain a provision that allows the landlord to refuse in the landlord's absolute discretion:
(a) consent to the grant of a sublease, licence or concession in respect of the whole or a part of the shop; or
(b) consent to the tenant parting with possession of the whole or a part of the shop; or
(c) consent to the tenant mortgaging or otherwise charging or encumbering the tenant's estate or interest in the lease.