Google-drive – How to set a Team folder to be accessible by ALL Team members

Only one person can own a folder in Google Drive. You can allow access to other people, but there can be only one owner.

http://support.google.com/drive/bin/answer.py?hl=en&answer=2494886

Here's an answer, though you might not like it:

http://support.google.com/drive/bin/answer.py?hl=en&answer=2494892

Once you transfer ownership of a file, you lose ownership for yourself. You effectively change the doc from something you own to something that was "shared with you."

There is no way to downgrade a user back to editor unless you contact them to make you the owner again (you can't complete this change once you transfer ownership)