Vegas law (or perhaps NV law?) outlaws windows from being openable in hotel rooms. I believe the law was enacted because too many tourists were leaving las vegas by jumping out of their hotel windows and dying on impact on the ground below. It was a problem that happened most especially with those who gambled away everything they owned.
The law doesn’t apply to windows on condo towers, presumably because the people in these rooms are local owner occupants, and thus more stable.
So the only way to open a window in a vegas hotel room nowadays is through excessive force. Which is what the shooter used to open his hotel windows.
That makes sense.