The interior or grounds of a building or facility; the area within a site such as a station, school, or factory (e.g., 駅構内).
駅構内は禁煙ですので、ご注意ください。
Please note that smoking is prohibited inside the station premises.
構内放送で次の電車の案内があった。
There was an announcement over the station PA about the next train.
工場構内への立ち入りには許可が必要だ。
Permission is required to enter the factory premises.