The Chofu Station North Entrance Police Box, designed by renowned architect Kazuyo Sejima and completed in 1994, stands as a notable example of contemporary security architecture in Tokyo's Chofu ward. Located in Kojima-cho, this public safety facility showcases Sejima's distinctive minimalist approach and refined spatial design. Built during a formative period of her career, the structure demonstrates her signature attention to material qualities and geometric precision. As a security and disaster prevention facility, it effectively balances functional requirements with aesthetic considerations, reflecting the architect's commitment to elevating everyday public structures into thoughtfully designed architectural interventions. The building remains significant within Sejima's diverse body of work.