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In page Mezzanine:

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Mezzanines help to make a high-ceilinged space feel more personal and less vast, and can create additional floor space.[3] Mezzanines, however, may have lower-than-normal ceilings[4] due to their location. The term "mezzanine" does not imply a function, as mezzanines can be used for a wide array of purposes.[5][6]