It still received regular cleaning services and etc to all floors. Only a few bothered to leave our corner of our floor.
Using the executive suite bathrooms was a real treat.
Later I worked in a scyscraper. Our floor was never exactly full, then like 80% on the floor were laid off. Entire teams gone.
Eerie is a good way to describe it. Being more or less alone with so much space, especially when you remember better days, is not fun.
I had the same experience - facilities dutifully kept doing their thing. They also worked through one week business shutdowns. First time, food kept coming too.
Now I work from home, which can be a different kind of isolating. If people left (one way or the other) I'd hardly notice unless they're on my team. (Still prefer the homeoffice overall, but eager to see my coworkers again occasionally.)