The lease is of the whole (or part) of one or more floors of an office building and is an internal only demise. The tenant repairs the demise. The lease is a full repairing and insuring lease (FRI lease).
The landlord insures the office building.
The landlord retains responsibility for the repair and maintenance of its retained parts of the office building. The landlord recovers the costs it has incurred through a simple on demand service charge mechanism.
The lease contains optional provisions for an upwards only open market rent review.