second home

noun6

1. •
   A secondary residence.
2. •
   country house
3. •
   vacation home
4. •
   pied-à-terre
5. •
   A home of a close relative or friend where one spends a great deal of time or feels welcome.

   • After the death of his [Verney's] first wife, he proposed to Florence Nightingale but she refused him. Later he married her sister, and for many years Claydon was Miss Nightingale's second home. — 1960
6. •
   Any place where one spends a great deal of time away from one's primary home, such as an office, a remote town or a foreign country.