Google has made changes in Google plus pages allowing multiple admins for the pages.You can now delegate up to 50 named managers as administrators for a page, inviting them via email address.
To add admins to your page
1.Go to google plus page
2.Click the gear icon on the upper right
3.Select google plus settings
4. Click the Managers link on the left side, to view current managers and add new ones per email.
Google says that the owner can transfer ownership of the page to one of the managers and will then be demoted to manager status. After that, managers and owners will also be able remove him from the page.