Active Onlookers: Enhancing Building Security through Harnessing Passive Security Strategies

This study explores how passive security strategies—particularly natural surveillance and spatial visibility—can enhance safety in mid-rise mixed-use buildings. Drawing upon Jane Jacobs’ “Eyes on the Street” theory [1] and Crime Prevention Through Environmental Design (CPTED) principles [2–4], it argues that visibility-based planning can effectively reduce opportunities for crime by encouraging active observation within architectural and social spaces. Using isovist and spatial visibility analyses [5, 6] the study examines how layout configuration, façade transparency, and material reflectance contribute to perceived safety. By focusing on Davao City’s urban context, the research demonstrates that design elements such as lighting, transparent materials, and open spatial arrangements promote passive monitoring without reliance on advanced surveillance technologies. The findings emphasize the integration of social behavior, cultural context, and environmental perception in achieving security through architectural form. Ultimately, the study advocates for the fusion of passive and selective active systems to build safer, contextually responsive environments in resource-limited urban settings.