Enable ‘Developer Options’ in Lollipop on a Nexus device

Perhaps not news, but it will always help someone.  Shown here on a Nexus 7 2013 running Android Lollipop

Ok, so how do I do it?

Under Settings > About [tablet], where you tap Build number seven (7) times. After a few times it starts to count down, and then it shows “you are now a developer!”. That’s it. Developer options can now be found under Settings.