https://www.youtube.com/watch?v=T8JwNZBJ_wI
In the first scene, we see fog outside the windows.
According to the Weather Underground, it was foggy in Seattle on February 1 and 2, with rain on the 1st. There was no fog or rain on February 3 or 4.
Conclusion: the video was recorded on either Saturday or Sunday. Hence the empty building.
https://www.youtube.com/watch?v=T8JwNZBJ_wI