station building; station complex
Refers to a building that houses a train station, often including shops, restaurants, and other facilities. Commonly used for large multi-purpose structures directly connected to or integrated with a railway station.
The new station building has many shops inside.
駅ビルのレストランで待ち合わせよう。
Let's meet at the restaurant in the station building.
Compound of 駅 (station) and ビル (building, from English 'building'). A straightforward modern coinage.