pied a terre

/ˌpjeɪd ɑː ˈtɛr/
noun
  1. A small living space, such as an apartment, used as a temporary or secondary residence.
    • They kept a pied-a-terre in the city for weekend visits.
    • Her pied-a-terre was a cozy studio near the theater district.
    • After retiring, he sold his pied-a-terre and moved to the countryside full-time.