Why?

I assume from the photo that the article is talking about commercial rent hikes?   If so, why would this be the case?   Companies have just spent 2 years learning they can operate pretty well with half the staff on any one day working from home.  My expectation would be that city commercial renters will only take half the space when they renew, leading to a glut of cheaper space available in the city.

Where is that expectation wrong?