mezzanine
US /ˈmet.sə.niːn/
UK /ˈmet.sə.niːn/

1.
мезонин, антресоль
a low story between two main stories of a building, typically an intermediate floor between the ground floor and the first floor.
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The library has a beautiful mezzanine level with extra seating.
В библиотеке есть красивый мезонин с дополнительными местами для сидения.
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We watched the concert from the mezzanine seats.
Мы смотрели концерт с мест мезонина.