https://finance.yahoo.com/news/silicon-valley-grapples-security-risks-080012598.html

“Companies invest in security but purposefully keep physical security measures discreet because the vibe is casual and relaxed,” said Joe Sullivan, the former chief security officer at Uber Technologies Inc. and Facebook Inc. who’s now an independent consultant. “Leaders want to stay connected with their teams, generally choosing less visible security than you would see in traditional finance or media companies.”

In an American age where shooting rampages have become increasingly common, openness can work against companies, said Jeff Harp, a retired agent at the U.S. Federal Bureau of Investigation in San Francisco who consults for technology companies. While employees are required to badge into buildings, access to many outdoor areas is generally accessible to all.