How do I grant permission to another user for my Google+ product / brand page?

Question

I have recently created a page for my workplace in Google Plus, using my Google account. I would like my colleagues to also be able to log in to this page to manage and update it.

How do I give another user access to a page I have created?

When I go to Google+ Page management, it says:

Shown below is the list of Google+ pages you have either created or have been given access to. You can view the page, edit it or change its settings.

which firmly implies that it's possible.

Answer 1

From the Google+ page: "+Dennis Troper wanted to update you and say we are already working on multi-admin support, ownership transfer and page analytics." (emphasis mine)

So it's not quite ready.