This is the 5073rd most frequent Russian word.
многоэтажке
A "многоэтажке" refers to a multi-story residential building or apartment block.
The word 'многоэтажке' is in dative case, showing the location where the subject resides.
Я живу в многоэтажке на пятом этаже.
I live in a multistory building on the fifth floor.
The word 'многоэтажку' is in accusative case, indicating the direct object of the action of construction.
Они строят новую многоэтажку рядом с парком.
They are building a new multistory building next to the park.
The word 'многоэтажкой' is in instrumental case, used here to describe the relationship or location of the parking lot in relation to the building.