How could Shane Tamura enter the Blackstone Building without being stopped?

The building sits just steps from Times Square. Inside, it houses dozens of corporate offices — including one that works with the NFL.
Authorities say Shane Devon Tamura, a 27-year-old man from Las Vegas, entered the 44-floor Blackstone Building and went up to the 33rd floor. He opened fire — triggering a full evacuation.
But this isn’t just about what happened. It’s about how it was allowed to happen.