second home

noun

1. an additional residence, as at the shore or in the country, where one goes on weekends, vacations, and the like.
2. another residence, as of a close relative or friend, where one spends a great deal of time or feels welcome and at home:

   Aunt Sue's house was my second home.

3. any place where one spends a great deal of time:

   My office is my second home.