The design architect, Adrian Smith, did not like the first design of the upper part of the building. He added 27 new floors and an aluminium spire to the top of the plans. The design of Burj Khalifa based on those used in Islamic architecture. Burj Khalifa has been said to have had several other planned height increases since it was first built. This has not been proven to be true yet. The TV/radio communications mast was added to the tower's plans in 2007. This was after building work had begun in 2006. There are pressurized, air-conditioned refuge floors about every 35 floors. These were put into the tower in case of an emergency or fire.