It was a house not a tenement.
Front door was a standard wooden frame with upper portion consisting of 2 glass vertical panels and lower section 1 plywood panel. If access was needed in emergency, (or indeed by a thief who fancied trying his luck), then it was easy enough to smash a glass panel, (even though it was 6mm safety glass), and by putting a hand through simply unlocking the yale lock.
Front door was a standard wooden frame with upper portion consisting of 2 glass vertical panels and lower section 1 plywood panel. If access was needed in emergency, (or indeed by a thief who fancied trying his luck), then it was easy enough to smash a glass panel, (even though it was 6mm safety glass), and by putting a hand through simply unlocking the yale lock.