As a CIO, do you have an open door policy? Would you go visit your staff in their spaces?

Yes, regularly practicing. Definitely it will significantly enhance communication, trust, and overall
workplace culture.

Every day

Absolutely Yes, most of the time I go to the team & have some discussions as not everyone reaches out to us, we need to go extra mile to meet our teams...

If I had a door it would be open ;) 
No offices except for a small handful of exec. Whole building is hotdesking too, so I sit alongside my team whenever I am in the office

We need both the options