There are so many reasons apartments are so much safer than single homes. For one all the units are clustered together and are not easily accessible like a single home. The higher you are, even your windows cannot be accessed from the outside. Apartments also have many layers before getting to the main entrance. There is the entrance to the unit, then a main door, then probably a side door and finally the door to your apartment. For a potential thief, there are so many barriers to overcome before getting in. In addition to this many apartments have a security guard at the main entrance who only allows permitted visitors.