How about no workspace at all. Can we all drop the collective illusion about cramming into an office together to "brainstorm" or whatever?
The best option is to provide flexibility as needed and build up infrastructure around that.
I worked entirely remotely for about a year and I hated it. Maybe it’s not a skill I have, but I definitely felt isolated and like something was lost.
I’ve also read somewhere (sorry don’t remember the specific source) that people who work entirely remotely when others are in an office tend to lose out on things like promotions and end up making less.