Remodeling the Annex: Otto Frank renovated the secret annex above his office at Prinsengracht 263, creating living spaces, a bathroom, and a hiding space.
Stockpiling Supplies: He started accumulating necessary items such as food, clothing, and household supplies to be stored in the annex.
Obtaining False Identities: Otto Frank secured false identities and papers for his family members to assume new names and identities during their time in hiding.
Establishing Contacts: He established connections with trusted friends and business associates who would help support and supply them while in hiding.
Practicing Silence and Secrecy: Otto taught his family the importance of maintaining absolute secrecy. He stressed the need for them to be silent, cautious, and vigilant at all times to avoid detection.
Arranging Provisions: Otto made arrangement to have trusted suppliers deliver food and necessities discreetly to the annex, ensuring that they would have access to essentials during their seclusion.
Preparing for Emergencies: He developed contingency plans in case of emergencies, including escape routes and alternative hiding location if the annex was compromised.