Here are the possible solutions for apartment with a staircase clue
Answer
Clue
Relevancy
duplex
Clue
Apartment with a staircase
Definition
to make duple
unit
Clue
Apartment, to an apartment manager
any
Clue
"... card, ___ card" (Last week: The two diagonally hidden 18-letter titles were "Up the Down Staircase" and "Upstairs, Downstairs." The latter answer turned downward at the D of "Downstairs.")