Some countries have actually legalized squatting in certain situations (like if a building is long term empty) to put some fire under the landlord’s ass to either find a paying tenant or sell. And honestly I think it’s an inelegant but effective solution.

It’s not productive to have real estate units sitting empty in the middle of the city and we simply shouldn’t allow it.

I worked for an engineering company that had "secret" projects. So when you were assigned to a secret project, you'd move all your desk stuff into that project area where everyone coming and going had to enter a security code to get through the door. But the size of projects would vary over the weeks. I remember one Friday I finished my work on a secret project along with several other people in the desks and drafting tables near me. The next Monday, we found that our desks were in the same place, but they'd moved the wall; so we were outside the project area - or actually we had been absorbed into a different project area with a different door code. So in those big buildings, there may be small offices, but they are easily reconfigured.

I wonder if squatting in high-rise office space might give rise to sort of communal life - something more social than single-family units of today. It will be an interesting social experiment

I think it's less likely they'll turn a blind eye these days. Oakland was similar but there was a massive crackdown on artists wherehouse spaces after the GhostShip fire (36 people lost their lives) .