While the Kingdom Tower promises to house 121 serviced apartments, 360 residential apartments, a 200-room Four Seasons hotel and much office space to boot, its top 85 floors will go unoccupied as they are too narrow for apartments or offices (some will house plant machinery and communications equipment).
In truth, the developers are probably not that bothered if their tower takes time to fill up – this is often the case when exceptionally tall, speculative towers are marketed: the Empire State Building took two decades to fill with tenants.