office - Definition from Longman English Dictionary Online
A provisional military government took office (=started in an important job or position).
Can I say "come into office" or "get into office" in place of "take office"?
What about "get into office"?
In American English, the phrase "take office" is more common, with the opposite being "leave office".
"obama takes office" - Google Search
I feel that I would most likely use the phrase "take office", though "get into office" sounds familiar. The phrase "come into office" sounds okay to me, but less familiar than "get into office".