Issues such as these are also related to cost. The speculative developer must contain his costs within profitable margins, and so may argue that the provision of better service areas in offices is not cost-effective, as the area itself would not be included in the conventional rent value calculation. The user, on the other hand, resorts to compromised arrangements, which in effect are inefficient and add cost. Extra security measures need to be paid for, and very often alterations to the building need to be undertaken to obtain better efficiency. Very often off-site storage is leased in addition. In my experience, bespoke buildings for office occupiers achieve better results in the evaluation and delivery of this type of facility.