Defensible Space Theory
CPTED
A residential environment whose physical characteristics — building layout and site plan — function to allow inhabitants themselves to become key agents in ensuring their security.
Origin
Architect and city planner Oscar Newman developed the theory in his 1972 book Defensible Space: Crime Prevention Through Urban Design, based on studies of New York City housing projects. He found that high-rise buildings had higher crime rates because residents felt no territorial ownership over anonymous shared spaces. Newman built on Jane Jacobs's 1961 concept of "eyes on the street" and laid the groundwork for the broader field of Crime Prevention Through Environmental Design.
Everyday Use
Notice how some apartment complexes feel safe while others don't, even in the same neighborhood? Layout matters: well-lit walkways, visible entrances, and small shared courtyards create a sense of ownership. When residents feel like a space is "theirs," they watch over it — and would-be offenders sense it too.