mezzanine floor (noun)

1. Why did the mezzanine floor go to the party? Because it wanted to be a high-rise!

2. In the anime series, the protagonist's secret hideout was located on the mezzanine floor of an abandoned building.

3. The fashion boutique on the mezzanine floor is known for its unique collection of designer clothing.

4. The mezzanine floor in the modern office building allows for additional workspace without increasing the building's footprint.