High whine of the broken intercom buzzer.
Homely hum of above flat's boiler firing in to action.
An unfamiliar sitcom theme tune coming from next door's TV.
Aeroplanes, taking sleepy people to exciting places.
The occasional passing police-car siren.
Teenage boys from the neighborhood chatting, laughing and smoking in the stairwell.
Tired car engines, pulling up and switching off.