A friendly Siberian Husky accustomed to an active lifestyle

We got this husky two years ago, and it was immediately clear that he's a very energetic and friendly dog. His name is Kai, and he loves walks, especially in cold weather. We used to live in a house with a large yard where he could run freely. But about a year ago, we moved to an apartment, and although we still walk him every day, the space has become much smaller. At home, he's calm and often just lies near the door or window. He's very friendly with people and loves attention. We decided that it would be better for him to live in a place with more space and the opportunity to be active.