Mechanical floor
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A mechanical floor, mechanical penthouse, mechanical layer or mechanical level is a story of a high-rise building that is dedicated to mechanical and electronics equipment. "Mechanical" is the most co
Mechanical attic (fourth floor) in Moore Hall at UCLA
A 60-story building under construction in Shanghai. The truss sections (made of triangular struts) will house mechanical floors.
The former World Trade Center twin towers. The "dark bands" were vents for the mechanical floors.
Mechanical equipment (elevator engine, cooling tower, and boiler) serving a high rise condominium, concealed within a decorative concrete enclosure to match the exterior of building
Storey
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A storey or story, is any level part of a building with a floor that could be used by people. Plurals for the word are storeys and stories.
A large elevator panel in a North American high-rise omits several floors as well as designating three separate levels as penthouse floors.
An elevator control panel in an apartment building in Shanghai. Floors 4, 13 and 14 are missing.
Letter boxes of a residential building built in the 1970s in Hong Kong. The Chinese and English floor numberings use the traditional Chinese and the British systems, respectively, resulting in different numbers.
A Dover Custom Impulse elevator control panel with floor numbering. In most buildings in the US and Canada with more than 12 floors, there is no floor numbered 13. The ☆ indicates the main entry floor.