Many clauses in commercial leases are “permissive”, and allow the tenant to implement changes or
alterations to the property or its occupation (for example alienation or user). Usually, however, the
landlord’s formal consent is required, and the lease will contain provisions governing how this is to
be obtained and documented. These clauses also usually provide for the landlord’s consent not to be
unreasonably withheld or delayed and, if not, provisos to this effect are imported by statute in
relation to alterations and alienation, but not user.