The San Francisco Chronicle recently profiled a problem that area startups are facing: office thieves. A pair of companies in San Francisco, BuildZoom and Demand Local, have both been targeted by burglars, who broke into their headquarters and plundered their “open offices.” Could the layout have helped these criminals steal electronics?

Security camera footage from BuildZoom shows a thief, who appears to be a young woman, walking around from desk to desk, opening drawers and inspecting the workstations. She can be clearly seen picking up items and putting them into a green plastic bag. Because the desks are all clustered together, it’s easy for the camera to watch her—but it’s also easy for her to steal.

Writing for Fast Co. Design, Shauncy Ferro questions whether or not the same things that make the “open office” so desirable also make it vulnerable. This is encouraged by the more free-form approach to professional life that many startups and tech companies take, which encourage employees to work during irregular office hours and/or remotely.

“Especially in Silicon Valley, companies are intent on creating a playful office vibe, one that may make people more trusting about leaving their stuff out,” Ferro writes. “High-tech access cards and ID badges give the illusion of security, but, in reality, those measures can be easily circumvented by a single employee holding the door open for a stranger.”

By reconsidering layout and design, office managers can enforce greater security, whether it’s through installing surveillance cameras, providing employees with used workstations that feature locking drawers or establishing a set of storage lockers for belongings. Encourage your employees to keep their possessions secure when they’re away from the workplace.