The word mezzanine comes from an Italian word, “mezzano” meaning middle.
A mezzanine floor is an intermediate floor between main floors of a building, and therefore typically not counted among the overall floors of a building.
The facilities (mostly shops and industries) which have high ceilings, allow unused space to be utilized by creating a mezzanine floor. The mezzanine is often used for storage of tools or materials.
The high roof of the shop is ideal for a mezzanine, and offices can be put either below or above it. Mezzanines are frequently used in industrial operations such as warehousing, distribution or manufacturing.