The secret annex was the hidden part of the main house which was located at Prinsengracht 263, Amsterdam. It was composed of several small rooms, including a living area, bedrooms, a bathroom, and a small attic.
Hidden Entrance:
Access to the secret annex was through a concealed bookcase which could be opened to reveal the entrance.
Camouflaged Windows:
The windows of the secret annex were partially covered with curtains, bookcases, or pieces of furniture to prevent from outside onlookers.
No Direct Sunlight:
The secret annex did not have any direct windows that faced the street. Instead, it relied on skylights for indirect light.
Communication:
The annex had a telephone line which allowed the people inside to communicate with the outside world.
Supplies:
The people hiding in the secret annex were completely dependent on others to bring them food, supplies, and other necessities.