1.
middle layer; middle levels
The middle of several layers, in the air, the sea, the earth, or a building's floors.
2.
mid-rise (building)
Of a building: of medium height, in Japan roughly three to five stories.
Related Words
Compare:
中間層 (the middle class)
Compare:
中流 (the middle class)
Related:
下層 (lower layer, lower stratum)